IBM Modbus Plus - Manual (Page 18)

Modbus Plus X-Link Driver User’s Guide
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4.6 Status Counters
The status counters are maintained within the Modbus Plus driver for
logging events and errors. The Status menu allows you to monitor some of
these counters. As well, the status counters can be accessed as a data source
for mappings.
The Modbus Plus driver status counters include counters for each Modbus
command type.
Refer to the Modicon IBM Host Based Devices User’s Guide for more
information on the Status Counters.