SCHNEIDER 140NOC78100 Programmable Automation Controller Communicating Module

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These words are updated by the system, and can also be reset using %S80.
 %SW80: Number of Modbus messages sent by the system as client on all communication
ports except USB and Ethernet copro.
NOTE: Modbus messages sent by the system as Master are not counted in this word.
 %SW81: Number of Modbus messages received by the system as client on all communication ports except USB and Ethernet copro.
NOTE: Modbus messages received as response,to the requests sent by the system, as Master, are not counted in this word.

This word is used to set a maximum number of requests which can be processed by the PLC per
master task cycle.
When the CPU is the server: This number of requests must be between 2 (minimum) and N+4
(maximum).
N: number differs depending on the model.
When the CPU is the client:
N: number differs depending on the model.The value 0 does not work. If a value that is
outside of the range is entered, it is the value Nthat is taken into account.
See also chapter "System Objects" (see Unity Pro, Program Languages and Structure, Reference Manual ) in the Unity Pro ProgramLanguages and Structure Reference Manual.