The response time is affected by the Quantum CPU Scan. Though the message is sent immediately to an option module like the Quantum NOE, the actual response will not be received by the CPU until the CPU services the NOE on the backplane at the end of User Logic scan. Factor also if the destination device has a similar requirement to service its backplane at the end of scan. Slave bases do not execute User Logic have an inherently faster response. Consider 2 CPU scans from the Quantum master for a safe total response time. Refer to the timing diagram below for details which outlines the request, response, and servicing of the option card via the backplane to realize the response in the CPU.
Legacy KB System (APS) Data: RESL173848 V1.0, Originally authored by on , Last Edited by on
Related ranges: Modicon Quantum