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The purpose of this resolution is to inform Momentum Processor users that a problem exists with port 2 of a 171CCC780x0 M1 when used as a Modbus Master port for Modbus RS485 communications. This problem only affects port 2 communications when configured as a Modbus Master. This does not affect port 2 Modbus slave communications or functionality.
Goals and Symptoms
A Response Timeout Error (116) is displayed in the XMIT or XXMIT Function Block when using Port 2 as a Modbus Master communicating to a slave device. Although a query is sent by the M1 and the slave responds properly to the query, the data is not received by the M1.
Facts and Changes
The M1 processors affected are: 171CCS78000, 171CCC78010, and 171CCC78010K.
Causes and Fixes
The component exhibiting the problem described is an Innovasic PTQ1001-01 (refer to the highlighted component in the diagram below) and is no longer used in manufacturing. All AMD or Innovasic PTQ1001-03 components used in this location work properly and do not exhibit the problem. The component can be viewed without removal of the PC board from the plastic case.