How can we help you today?

Modicon M221 - TM3 bus doesn’t work with TM3DM24R or TM3XTYS4 SV 2.0

Problem description:

If TM3DM24R or TM3XTYS4 module is placed before TM3 analog input modules (TM3A* or TM3T*) with TM221 controller.

Results:

- The TM3 expansion bus communication is not operationnal, the IO ERR Led is fixed red.
- The system word %SW118 is different than 16#FFFF (bit 13 or bit 14 is set to 0).

=> This issue is fixed by the M221 firmware version v1.10.1.3 attached to this FAQ.