Frequently asked questions
Modicon M262 Error message "The device is not ready for Encrypted Communication" .
FAQ000276266
18 August 2025
Issue:
When trying to connect using Controller Assistant or Machine Expert logic builder , TM262 is giving "the Device is not ready for encrypted communication" .
Product Line:
M262 Product Line.
Machine Expert Logic Builder .
Please try the below Workarounds to see whether you can connect to Modicon TM262 PLC ,
(1). As per Machine Expert V2.3 Release notes there has been Bug Reported and the workaround is , Deselect the option Encrypted Communication in communication Settings under Device Tree Tab in Controller Selection mode of the Ecostruxure Machine Expert Logic Builder
(2). If the issue still persists after De-selecting the Encrypted Communication (as per workaround (1)) then please follow the below notes ,
As per Machine Expert V2.3 Release Notes there has been a Bug reported , Login with encrypted communication to the Modicon M262 controller is not possible after updating the firmware to V2.2.2. Due to a change in certificate handling in EcoStruxure Machine Expert V2.2.2, encrypted communication does not work when you reuse the previous version of the certificate after upgrade to V2.2.2.
Workaround: Delete the existing certificate by using the Security Screen editor or perform an SD card upgrade to V2.2.2.