VersaMax Nano PLC and Micro PLC CPUs

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Operating Notes/RestrictionsHigh-speed Counter:For certain high and low limit values, depending on the actual count and frequency, a type B counter configured for single-shot operation may change its outputs after hitting a high or low limit.Description: Input references %I489 - %I493 are overwritten by the HSC function, and are not available to the application program. Recommendation: Avoid using references %I489 - %I493 (which are located immediately before the rest of the HSC input references) in the application program.
Description: When sending data commands to the High-speed Counter using the COMMREQ function, the CPU ignores the data type and start location parameters. These parameters specify where the command and data words are located in CPU memory. The CPU expects these three parameters to be located immediately after the command block.
Recommendation: Be sure the command word and data words are located contiguously in memory, with the rest of the COMMREQ command block. They should immediately follow the "Start Location of Command Word" in the COMMREQ command block. Description: If HSC Enable is On while in Stop mode and the High-speed Counter is configured for its output to be Off when placed in Run mode, the output will momentarily turn on when the PLC state changes from Stop to Run.