Specifications

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Acti 9
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connection kit
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  • MSC DC chassis
  • INS400
    • Width
      215 mm
      EU RoHS Directive
      Compliant
      WEEE
      The product must be disposed on European Union markets following specific waste collection and never end up in rubbish bins

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      Frequently Asked Questions

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      What is the mounting frame for the 4025H2

       Part code is 4000H2

      What is the Run Current and In-Rush current for FLS50LED, LED slimline floodlight 50W 4000K?

      FLS50LED has the below details 

      -Run current: 0.249A 
      -In-rush current: 15A 

      Datasheet attached for further reference. 


       

      Is the 4 position selector switch available in 22mm operators?

      Issue:
      Do we make a 4 position selector switch in a 22mm operators?

      Product Line:
      Harmony Pushbuttons

      Environment:
      All Products

      Cause:
      Product Features

      Resolution:
      We do not. Would recommend that the customer use a 9003K2 cam switch. It will mount in a 22mm hole.

      What is the replacement lamp for a EXITSM?

      Unfortunately we do not sell these as spare part you will need to seek a different manufacturer such as osram etc.

      The specs are a 4000K, 1.2 Watt LED Tube.
      Highly efficient LED lamp: The fitting is equipped with a 1.2W LED tube which provides longer life and lower power consumption.

      What is the size of the inter conductor for the N-series recloser cables (38kV)?

      This size will vary depending upon the rating of the conductors:


      • 1. 250A 80mm2
        2. 340A 120mm2
        3. 400A 180mm2
        4. 630A 240mm2
        5. 800A 400mm2

        These are shown in more detail in the attached guide.

        Olex cables.pdfOlex cables.pdf


      Legacy KB System (APS) Data: RESL212274 V1.0, Originally authored by DaFr on 08/09/2013, Last Edited by DaFr on 08/09/2013
      Related ranges: Others protection relays

      Configuring Concept I/O Scanning for ZBRN1 Receiver

      After setting the IP address
      Set the UNIT ID to 255
      Read Ref Slave to 400001
      Read Length to 4    (This will read 4 16 bit registers)
      Read Ref Master to a location on the PLC ex. 400100

      This will write to 400100, 400101, 400102 & 400103

      What is the Colour Light output (CCT) of the CLIFLS20LED Floodlight

      The output CCT is 4000K

      What is the Rubber Boots Part Number for the 9001K Joysticks?

      Issue:
      Rubber boots sold separately for the 9001K joysticks

      Product Line:
      Harmony Pushbuttons

      Environment:
      All Products

      Resolution:
      The part number for the rubber boot for the 9001K joysticks is 6512243201.

      What is the difference between the 9001K20 and the 9001K21?

      Issue:
      What single potentiometer operator with single pot should be used with 10 ohms?

      Product Line:
      Harmony Push Buttons

      Environment:
      All products

      Cause:
      Product Features

      Resolution:
      The 9001 K20 is the operator only without the single pot. The 9001 K21 is the operator with the single pot.

      What is the outside diameter and depth of the 9001K68 / 9001K685 mushroom button guards?

      Issue:
      What is the outside diameter and depth of the 9001K68 / 9001K685 mushroom button guards?

      Product Line:
      Harmony Pushbuttons

      Environment:
      All Products

      Cause:
      Product Features

      Resolution:
      Outside diameter: 2.75`` (70 mm)
      Depth: 1.14`` (29 mm)


      CTA-ID : 2023559

      What is the parts breakdown of a 9001K2L35LRR?

      Issue:
      What is the parts breakdown of a 9001K2L35LRR?

      Product Line:
      9001K and 9001SK Push Buttons

      Environment:
      Push Buttons and Operator Interface

      Resolution:
      9001K2L, 9001KM35LR, and a 9001R7.
       

      What is the part number for a guard for a 9001KR9R?

      Issue:
      What is the part number for a guard for a 9001KR9R, 9001KR8R, 9001SKR9R or 9001SKR8R?

      Product Line:
      Harmony Pushbuttons

      Environment:
      All Products

      Cause:
      Product selection

      Resolution:
      There are 2 versions.  9001K56YM is a yellow guard, 9001K56RM is a red guard.  These guards have finger cutouts for use with push pull operators.


      CTA-ID : 2060783

      How do I scale 0 - 4095 to 6400 - 32000 using 984 Ladder Logic?

      The following network scales data from 0-4095 to 6400 - 32,000 when 4-20ma (6400 = 4 mA, 32,000 = 20 mA) outputs are required
      but a 0-20ma analog output is used. .





      Register 400001 and 400002 are used together in the top node of the EMTH Block, where 400001 is
      always 0000 data and 400002 is the variable data, 0-4095, to be scaled. Register 400003, displayed in data
      format float, is a fixed floating point value that the user enters as 6.25153 (note that two registers are
      used to create the floating point value, 400003 & 400004 in this example). Register 400005 (and 400006)
      is the floating point result of the integer and floating point multiplication (EMTH block).





      The FTOI (Floating Point TO Integer) block converts the floating point result of registers 400005
      and 400006 to an integer value in a single register 400007.

      The AD16 block adds the top node register 400007 to the middle node constant 6400 and places
      the result in register 400009. This register will then map to one of the analog outputs.

      The following data screens shows the input values of 0 and 4095 and there corresponding results.





      What is the colour temperature for the L882WH ?

      The colour Temperature for the L882WH is 4000K . This is more of a cool white
      For more information regarding this product please visit the Clipsal website on the link provided
      https://www.clipsal.com/Trade/search-results?q=l882wh

      How can a floating point value be moved into 4XXXX registers in a Quantum PLC with 984 LL?


      A floating point value can be moved into 4XXXX registers with the equation network. An example of moving a floating point value of 123.456 into registers 40001 and 40002 is shown below:

       

      What size cut-out do i need for a TPDL300 downlight?

      You would need a 90mm cut-out for the TPDL series downlight.

      Some of the key features are:
      • 3000K and 4000K lamp temperature options
      • 30,000 hours rated lamp life to L70
      • Integral driver
      • Wide trim
      • 90mm cut-out

      For further information please visit https://www.clipsal.com/Trade/Products/ProductDetail?catno=TPDL300
       

      What is the part number for a replacement 9001 KS selector switch E key?

      Issue:
      What is the part number for a replacement 9001 KS selector switch E key?

      Product Line:
      Harmony Pushbuttons

      Environment:
      All Products

      Cause:
      Product selection

      Resolution:
      All standard replacement keys follow the same numbering system, 29411-01XX0 where the XX is replaced by the E key number. For an E11 key replace the XX with 11 for 29411-01110. For an E12 key replace the XX with 12 for 29411-01120.
      For the master keyed range, E36 through E60, use the same system with the base part number 29411-51XX0. So an E36 key is a 29411-51360. Master key, E99, is part number 29411-51990.
       

      What is the catalog number for a 9001Type K Pilot Light for 277 volts?

      Issue:
      What is the catalog number for a 9001Type K Pilot Light for 277 volts?

      Product Line:
      Harmony Push Buttons

      Environment:
      Harmony 30mm

      Cause:
      Product Selection

      Resolution:
      The catalog number is 9001KP8 which has a 277 volt AC transformer pilot light, however the colored lens is not supplied with this.
      You can get a plastic fresnel lens (A31 is amber, blue - L31, clear - C31, green - G31, red - R31, white - W31 or Yellow Y31),
      Plastic domed lens (A9 is amber, blue- L9, clear - C9, green - G9, red - R9, white - W9 or yellow - Y9),
      or glass lens (A6 is amber, blue - L6, clear - C6, green - G6, red - R6, white - W6 or yellow - Y6) by inserting the correct suffix.


      CTA-ID : 2035975

      How do I scale data from 0-32,000 to 0-4095 using 984 Ladder Logic?

       

      The following network scales data from 0-32,000 to 0-4095 for use with analog signals.





       
      Register 300001 contains the analog input data (0-32,000).

      This data gets BLKM (Block Moved) to register 400002. 

      Registers 400001 and 400002 are the top integer nodes of an EMTH (Divide Integer by Floating point) which is divided by registers 400003 and 400004 (display 400003 as data type float), the middle node registers that contain the floating point constant (7.814408).  

      The floating point result is found in registers 400005 and 400006 that is then converted by the FTOI
      (Floating point TO Integer) Block to register 400007.

      The “Generic Modbus” application does not provide status bits values in binary

      Issue:
      The “Generic Modbus” application does not provide status bits values in binary

      Product line:
      Generic Modbus Application or Similar application


      Environment:
      Generic Modbus Application or Similar application


      Cause:
      The “Generic Modbus” application does not provide status bits values in binary


      Resolution:
      Take the value provided by the application and convert it to binary by using a calculate like the one provided by Windows.  If using the Windows calculator, you may have to change the calculator to scientific or Programmer mode to accomplish this conversion.

      Below is a couple of examples from a Galaxy VX:

      Example 1:  Register 400002 (16385)

      16385 in BIN 100 000 0000 0001

      This example has 14 bits and to get to 16 bits two zeros were added to the left (red text)

      10 0000 0000 0001 is 0010 0000 0000 0001

       

      Example 2:  Register 400010 (512)

      512 in BIN 10 0000 0000

      This example has 10 bits so six bits needs to be added to the left (red text)

      10 0000 0000 is 000 0010 0000 0000



      The “Generic Modbus” application does not provide status bits values in binary

      Issue:
      The “Generic Modbus” application does not provide status bits values in binary


      Product line:
      Generic Modbus Application or Similar application


      Environment:
      Generic Modbus Application or Similar application


      Cause:
      The “Generic Modbus” application does not provide status bits values in binary


      Resolution:
      Take the value provided by the application and convert it to binary by using a calculate like the one provided by Windows.  If using the Windows calculator, you may have to change the calculator to scientific or Programmer mode to accomplish this conversion.
      Below is a couple of examples from a Galaxy VX:
      Example 1:  Register 400002 (16385)
      16385 in BIN 100 000 0000 0001
      This example has 14 bits and to get to 16 bits two zeros were added to the left (red text)
      10 0000 0000 0001 is 0010 0000 0000 0001
       
      Example 2:  Register 400010 (512)
      512 in BIN 10 0000 0000
      This example has 10 bits so six bits needs to be added to the left (red text)
      10 0000 0000 is 000 0010 0000 0000

       

      ​What would be an appropriate lighting option for my backyard?

      FLS Series

      Perfect for general illumination in residential or light commercial buildings. The 4000K colour temperature produces a warmer light output when compared to traditional floodlights, making them suitable for lighting entertainment areas or other spaces that have frequent human traffic.

      Features and benefits

      • IP65 rated aluminium die-cast body
      • 4000K lamp temperature
      • High lumen output
      • 36,000 hours rated lamp life to L70
      • 105˚ beam spread
      • Supplied with flex
      • 3-year warranty
      For further information please visit https://updates.clipsal.com/ClipsalOnline/Files/Brochures/A0000276.pdf

       

      What is the part number for the LED down lights?

      There are multiple LED downlights the series is TPDL.
      Some of the key features are:
      • 3000K & 4000K Lamp temperatures
      • 30,000 hours rated lamp life to L70
      • 100 degree beam spread
      • Integral driver
      • Wide trim
      • 90mm Cut-Out
      • IP44 rating
      • Easy to install
      • Supplied with flex
      • Able to be hardwired with one or two twin TPS cable
      • Dimmable
      For further information please visit https://www.clipsal.com/Trade/search-results?q=TPDL&p=1

      Are light fittings attachable on the Caloundra Sweep fans?

      You cannot fit a light to the non-light versions of Caloundra range. The only fan that has a light is the C4HS1300L-WE and this light is integrated into the fan, it is not a kit.
      This is a 4000K natural white LED. However, if customers prefer a warmer colour temperature, we also sell a 3000K warm white LED array separately (LEDFANKIT-WW).
       

      ​How to read Modbus Status bits

      Issue:
      How to read Modbus Status bits

       

      Product line:
      All products


      Environment:
      All products


      Cause:
      How to read Status bits



      Resolution:
      Using a Modbus tool like Generic Modbus Tester you receive the values in the two examples below.  The Generic Modbus tester does not provide binary values so the examples below shows the conversion.  If the application used provides binary then keep that part.

       

      Below is a couple of examples from a Galaxy VX:

      Example 1:  Register 400002 (16385)

      16385 in BIN 100 000 0000 0001

      This example has 14 bits and to get to 16 bits two zeros were added to the left (red text)

      10 0000 0000 0001 is 0010 0000 0000 0001

      Below is the mapping of the bits to the Modbus registers to the Galaxy VX.  You start the with zero on the right and end with 15 on the left.


       

      Example 2:  Register 400010 (512)

      512 in BIN 10 0000 0000

      This example has 10 bits so six bits needs to be added to the left (red text)

      10 0000 0000 is 000 0010 0000 0000

      Below is the mapping of the bits to the Modbus registers to the Galaxy VX.  You start the with zero on the right and end with 15 on the left.

      Modbus; How to read Status bits

      Issue:
      Modbus; How to read Status bits


      Product line:
      All products


      Environment:
      All products


      Cause:
      How to read Status bits


      Resolution:
      Using a Modbus tool like Generic Modbus Tester you receive the values in the two examples below.  The Generic Modbus tester does not provide binary values so the examples below shows the conversion.  If the application used provides binary then keep that part.
       
      Below is a couple of examples from a Galaxy VX:
      Example 1:  Register 400002 (16385)
      16385 in BIN 100 000 0000 0001
      This example has 14 bits and to get to 16 bits two zeros were added to the left (red text)
      10 0000 0000 0001 is 0010 0000 0000 0001
      Below is the mapping of the bits to the Modbus registers to the Galaxy VX.  You start the with zero on the right and end with 15 on the left.


       
      Example 2:  Register 400010 (512)
      512 in BIN 10 0000 0000
      This example has 10 bits so six bits needs to be added to the left (red text)
      10 0000 0000 is 000 0010 0000 0000
      Below is the mapping of the bits to the Modbus registers to the Galaxy VX.  You start the with zero on the right and end with 15 on the left.




       

      Accutech Modbus Register Mapping

      Modbus RTU protocol is supported on the BR10 and BR20 Base Radios. Transmission rates of 9600, 19200, 38400, 57600, 115200 are supported with even, odd or no parity, 8 data bits and 1 or 2 stop bits. The Modbus settings are configured by using the push buttons on the base radio only. The BR10 contains 1 RS-485 port for Modbus communications. The BR20 contains 1 RJ45 connection called the "Short Haul Data" port. This port can be configured for 2-wire RS-485 or 3-wire RS-232 by a dipswich next to the serial port.

      The following menu items are used to configure Modbus in the base radio via the push buttons. For a complete menu map of all Accutech Instruments, please reference the Accutech Wireless User Manual that is installed along with Accutech Manager Software an your PC.

      BAUD RT - Baud Rate
      DEV ID - Modbus Device ID
      PARITY - Parity
      STOPB - Stob bit selection
      MODMAP - Register mapping options (see below)
      MODADR - Modbus address of base radio
      ORDER - Floating point word order

      There are two user options to determine Modbus mapping in the base radio/field units. The MODMAP configuration determines if the mapping will be DEV mode (Device ID) or REG mode (Register)

      Device ID Mode

      • Poll for individual devices (Base Radio and Field Units)
      • Modbus Station ID = Base Radio Modbus Station Address + Field Unit RF ID
      • Modbus starting register = 40001

      Register Mode

      • Poll single Modbus station ID for complete Accutech network
      • Modbus Station ID = Base Radio Modbus Station Address
      • Field unit Modbus address are multiples of their RF ID
      • Modbus starting register = (Field Unit RF ID * 10) + 40001

      Base Radio Registers

      Base Radio Holding Register (Device and Register Mapping Modes)

      Device ID: 1 To 247 Max.

      Address

      Description

      Register Type

      40001

      Base Radio Device Type

      16-Bit Unsigned Integer

      40002

      Base Radio Device Status

      16-Bit Unsigned Integer

      40003

      Number of Field Units Expected on the wireless network.

      16-Bit Unsigned Integer

      40004

      Number of Field Units actually online in the wireless network.

      16-Bit Unsigned Integer

      40005

      Online/Offline Status Of Field Units with RFIDs 1-16

      16-Bit Unsigned Integer

      40006

      Online/Offline Status Of Field Units with RFIDs 17-32

      16-Bit Unsigned Integer

      40007

      Online/Offline Status Of Field Units with RFIDs 33-48

      16-Bit Unsigned Integer

      40008

      Online/Offline Status Of Field Units with RFIDs 49-50

      16-Bit Unsigned Integer

      40009

      Diagnostic Counter (increments each second)

      16-Bit Unsigned Integer

      40010

      Reserved For Future Use

      16-Bit Unsigned Integer

       

      Field Unit Holding Registers

      Field Unit operational data is stored in a sequential block of 10 Modbus registers in the Base Radio. The Modbus Station address and the actual register addresses will vary depending on the Modbus Mapping mode set in the base radio. The Modbus Station address and register locations are described below for each Mapping mode.

      Device ID Mapping Mode

      When DEVMODE is selected, the base radio stores the field unit and base radio operation data (10 Modbus holding registers) in separate Modbus Station addresses. In this mode, the SCADA Host (Modbus Master) needs to send an individual poll request for each field units data and the base radio data. Station addresses are determined using Base Radio Device ID parameter and the Field Units RFID parameter. This mode is suitable for systems using a template for each field unit.

      Field Unit Modbus Station Address = Base Radio Device ID + Field Unit RFID

      Field Unit Holding Register Addresses

      Field Unit Register Description

      Register Type

      40001 and 40002

      Device Type

      Two Modbus registers formatted as a 32-Bit IEEE Floating Point1

      40003 and 40004

      Device Status

      Two Modbus registers formatted as a 32-Bit IEEE Floating Point1

      40005 and 40006

      Primary Sensor Value2

      Two Modbus registers formatted as a 32-Bit IEEE Floating Point1

      40007 and 40008

      Secondary Sensor Value2

      Two Modbus registers formatted as a 32-Bit IEEE Floating Point1

      40009 and 40010

      Tertiary Sensor Value2

      Two Modbus registers formatted as a 32-Bit IEEE Floating Point1

      1The default floating point format for Modbus database registers is Low Word, High Word. For example if a floating point value is in registers 40001 and 40002 then 40001 is the low word and 40002 is the high word. For SCADAPack controllers 40001 is the high word and 40002 is the low word. The floating point word order is decided by Modbus Floating Point Order of base radio Modbus Communication Configuration.

      2Any field unit that is currently offline will return NaN (Not a Number) when queried for its primary, secondary or tertiary measurement value. If a field unit is online, NaN will also be returned for measurement values that do not exist in the device. For example, a field unit providing one measurement will return NaN for its secondary and tertiary values.

      Register Mapping Mode

       When REGMODE is selected, the base radio stores the field unit and base radio operation data (10 Modbus holding registers) in sequential blocks of registers located at a single Modbus Station address. The base radio uses register addresses 1 through 10 with subsequent groups of 10 registers used by each field unit. Station address is determined by the base radio Device ID and the Register addresses for each field unit are offset from the base radio registers by a factor of 10 times the field unit RFID parameter. This mode is suitable for a system that wants to poll for multiple field unit devices at once.

      Field Unit Modbus Station Address = Base Radio Device ID

      Field Unit Holding Register Addresses

      Field Unit Register Description

      Register Type

      40001 + (RFID * 10) and 40002 + (RFID * 10)

      Device Type (see list below)

      Two Modbus registers formatted as a 32-Bit IEEE Floating Point1

      40003 + (RFID * 10) and 40004 + (RFID * 10)

      Device Status (see list below)

      Two Modbus registers formatted as a 32-Bit IEEE Floating Point1

      40005 + (RFID * 10) and 40006 + (RFID * 10)

      Primary Sensor Value2

      Two Modbus registers formatted as a 32-Bit IEEE Floating Point1

      40007 + (RFID * 10) and 40008 + (RFID * 10)

      Secondary Sensor Value2

      Two Modbus registers formatted as a 32-Bit IEEE Floating Point1

      40009 + (RFID * 10) and 40010 + (RFID * 10)

      Tertiary Sensor Value2

      Two Modbus registers formatted as a 32-Bit IEEE Floating Point1

       

      1The default floating point format for Modbus database registers is Low Word, High Word. For example if a floating point value is in registers 40001 and 40002 then 40001 is the low word and 40002 is the high word. For SCADAPack controllers 40001 is the high word and 40002 is the low word. The floating point word order is decided by Modbus Floating Point Order of base radio Modbus Communication Configuration.

      2Any field unit that is currently offline will return NaN (Not a Number) when queried for its primary, secondary or tertiary measurement value. If a field unit is online, NaN will also be returned for measurement values that do not exist in the device. For example, a field unit providing one measurement will return NaN for its secondary and tertiary values.

      I/O Scanner Offset Inconsistent Issue Across Different PLC Platforms

      Goals and Symptoms

      To explain users the offset inconsistent issue across different PLC platforms when using Unity Pro software to configure I/O scanner table.

      Facts and Changes

      Due to the historic heritage reason, The Quantum product line including NOE77100/10/01/11, Quantum Copro 140CPU65150/60 do not support address %mw0 (or 400000). But Premium, M340 product line support address %MW0. So Unity Pro software allows users to put Read/Write index 0 for slave index in case the slave device is a Premium or M340 PRODUCTS.
      The consequence is that using Unity Pro software, if the remote slave device is a Quantum product, the Read and Write index number will be increased by 1. If the remote slave device is Premium or M340 product, there is no offset by one.
      Several I/O scanner configuration examples are used below for explaining this issue.

      · Example 1: NOE77101 I/O scanner configuration table using Concept software

        • Master device: Quantum NOE77101
      Slave device: Quantum NOE77111
      Read/Write length: 1
      Software: Concept V2.6


      Offset issue: NO.
      Read Ref Master (master address): 400001 (%mw1)
      Read Ref Slave (slave address): 400001(%mw1)
      Write Ref Master (master address): 400002 (%mw2)
      Write Ref Slave (slave address): 400002(%mw2)


      · Example 2: NOE77101 I/O scanner configuration table using Unity software
        • Master device: Quantum NOE77101
      Slave device: Quantum NOE77111
      Read/Write length: 1
      Software: Unity V2.3

      Offset issue: YES.
      Read Master Object (master address): %mw1 (400001)
      Read salve address: %mw1 (400001) Read slave Index: 0 the slave device is Quantum NOE, index number automatically increased by 1
      Write Master Object (master address): %mw2 (400002)
      Write salve address: %mw3 (400003) Write slave Index: 2 the slave device is Quantum NOE, index number automatically increased by 1

      · Example 3: Quantum NOE77101 I/O scanner configuration table using Unity software
        • Master device: Quantum NOE77101
          Slave device: 140 CPU65150
      Read/Write length: 1
      Software: Unity V2.3

      Offset issue: YES.
      Read Master Object (master address): %mw1 (400001)
      Read salve address: %mw1 (400001) Read slave Index: 0 the slave device is Quantum Copro, index number automatically increased by 1
      Write Master Object (master address): %mw2 (400002)
      Write salve address: %mw3 (400003) Write slave Index: 2 the slave device is Quantum Copro, index number automatically increased by 1

      · Example 4: 140 CPU65150 I/O scanner configuration table using Unity software
        • Master device: Quantum 140 CPU65150
      Slave device: Premium ETY 5103
      Read/Write length: 1
      Software: Unity V2.3

      Offset issue: NO.
      Read master Object (address): %mw1
      Read slave address: %mw0 Read slave Index: 0 the slave device is Premium ETY, index number remains the same, no added offset by one.
      Write master Object (address): %mw2
      Write slave address: %mw2 Write slave Index: 2 the slave device is Premium ETY, index number remains the same, no added offset by one.


      · Example 5: ETY5103 I/O scanner configuration table using Unity software
        • Master device: Premium TSX ETY5103
      Slave device: NOE77101
      Read/Write length: 1
      Software: Unity V2.3

      Offset issue: YES.
      Read Master Object (master address): %mw1
      Read salve address: %mw1 (400001) Read slave Index: 0 the slave device is Quantum NOE, index number automatically increased by 1
      Write Master Object (master address): %mw2
      Write salve address: %mw3 (400003) Write slave Index: 2 the slave device is Quantum NOE, index number automatically increased by 1


      In summary, getting the offset by one or not, it all depends on the remote device if accepting address %mw0 or 400000. If yes, it has no offset issue. If no, user will see the index number automatically increased by 1.

      Causes and Fixes

      Schneider Electric current has no plan to fix this issue because we don't want the large existing customers to change their application if they download the new firmware with the offset change.

      Starting Register number in Modbus Read functions

      Goals and Symptoms

      When performing Modbus read commands, it is important to apply the right starting register address in the read function. Otherwise, the wrong register will be accessed from the meter, giving unexpected data for the meter parameter being read.


      • Meter is functioning as expected. The front panel values for voltages and currents are within expected ranges for the system being monitored. However, modbus read functions from a master station (e.g. a PLC) give values that do not correspond to the front panel values.

      Facts and Changes

      Modbus, modbus rtu, function read, modbus map, holding register, staring register, function 03, modbus read packet

      Causes and Fixes

      Cause
      One probable cause would be that, the modbus function read command is not pointing to the right registers. The modbus protocol requires an offset to be introduced in the starting register address when reading the slaves register.

      Resolution

      When reading the meter parameters, the Master must send the device a Read Holding Registers packet. This packet must specify a start register and the number of registers to read. When the function read is received, the slave responds with a packet containing the registers in the range defined in the read request.

      However, consider the 3710 Modbus map, which states that according to the MODBUS protocol, in response to a request for address 4xxxx, the master reads register xxxx-1 from the slave (3710). For example, a request for register 40011 returns register 10 from the slave.

      What does the above statement mean? Why is an offset required?

      Holding registers, by default, are defined the 4xxxx range, the first holding register staring at 40001. The starting register in the read packet is, on the other hand, numbered from zero. Hence, the start register zero automatically points to holding register 40001, starting register one points to holding register 40002, etc. The fact that the first holding register is 40001 and not 40000 explains the offset that needs to be introduced in the starting register number.

      Hence, considering the 3710 Modbus Map statement, if the Master needs to read register 40011, then the corresponding starting register that needs to be put in the read function would be 10 (0A hex) since register 40011 is the register 10 from the first holding register, 40001:
      40001 > Start register 0
      40002 > Start register 1
      40003 > Start register 2
      40004 > Start register 3
      40005 > Start register 4
      40006 > Start register 5
      40007 > Start register 6
      40008 > Start register 7
      40009 > Start register 8
      40010 > Start register 9
      40011 > Start register 10

      The Modbus Read Request Packet for a master reading 3 registers from a slave with unit ID 100 (64 Hex) and for starting register of 40011 should be:
       

      Slave ID
      Function
      Start Register (40011)
      # of Registers
      CRC Checksum
      64
      03
      00
      0A
      00032C3C


      To summarize, when looking at a modbus map, the starting register number to be used in the read function:

      Start Register = Modbus Register 40001.

       

      Original article#12774

      Public

      All content © 1992-2007 Schneider Electric


      Legacy KB System (APS) Data: RESL188799 V1.0, Originally authored by KBAdPM on 11/03/2007, Last Edited by KBAdPM on 11/03/2007
      Related ranges: Modbus / JBus

      Where can I get support for APC and MGE Products?

      For support on APC and MGE products please visit:  https://www.apc.com/support/

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