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Momentum M1E MSTR Function Block May Freeze Operation for 3-5 Minutes

Issue
The purpose of this Resolution is to inform users of Momentum M1E processors and 171CBB97030 Processor/4-Port Switches, of a potential problem with the TCP/IP MSTR function block.

If two or more TCP/IP MSTR function blocks are programmed and active at the same time, the function block may freeze its operation for 3-5 minutes but recover on its own without user intervention.


Product Line
Momentum


Environment


Resolution
This issue is resolved by upgrading the PLC to the appropriate Exec version listed below.
Momentum M1E Processors

  • 984LL Exec version 1.28 or higher (171CCC96020, 171CCC96030, 171CCC96030, and 171CCC98030)
  • IEC Exec version 1.29 or higher (171CCC96020 and 171CCC96030)

171CBB97030 Processor/4-Port Switches (allows either IEC or 984LL Exec installation)
  • 984LL Exec version 1.03 or higher
  • IEC Exec version 1.05 or higher</