Fail-Soft Operation; Overview - Omron PROFINET NX-PNC202 User Manual

11-7 Fail-soft Operation

This section describes the fail-soft operation for PROFINET Coupler Unit.

11-7-1 Overview

This function allows the PROFINET Coupler Unit to start or continue IO refreshing only with the NX
Units that can operate normally when an error occurs for the Profinet IO Device Terminal.
PROFINET
Coupler Unit
PROFINET
Coupler Unit
Precautions for Safe Use
• If you change the fail-soft operation setting, the output status when the error occurs may also
change. Confirm safety before you change the setting.
• If you use fail-soft operation, write programming to determine whether Unit IO data is valid.
Without such programming, the user program cannot distinguish between Units for which IO
refreshing is continued and Units for which IO refreshing is stopped.
To determine whether Unit IO data is valid, you must assign the NX Unit IO Data Active Sta-
tus and the NX Unit Error Status from the IO data that is assignable to the PROFINET Cou-
pler Unit.
The NX Unit Error Status is not assigned by default. Add it to the IO entry mapping.
NX-series PROFINET Coupler Unit User's Manual (W623)
♯1 ♯2 ♯3
NX Unit NX Unit NX Unit
Error occurs.
♯1 ♯2 ♯3
NX Unit NX Unit NX Unit
Start or continue I/O
Stop or do not start I/O
refreshing for NX Units
refreshing for NX Units that
that can operate normally.
cannot operate normally.
11 PROFINET Coupler Unit Functions
End Cover
♯4 ♯5
NX Unit NX Unit
End Cover
♯4 ♯5
NX Unit NX Unit
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