Omron PROFINET NX-PNC202 User Manual page 221

Errors to Which Fail-soft Operation Applies
The following errors are examples of the errors to which fail-soft operation applies.
• Unit Configuration Verification Error
• NX Unit Communications Timeout
• NX Unit Initialization Error
• NX Unit Startup Error
*1. Even if you enable fail-soft operation, the PROFINET Coupler Unit may not start refreshing IO for any of the
NX Units when the Profinet IO Device Terminal is started, depending on the cause of the error. Refer to
Causes of Unit Configuration Verification Errors and Error Operation on page 11-29 for details on the opera-
tion for different error causes.
Refer to Error Descriptions on page 12-14 for the errors to which fail-soft operation applies. If an error
occurs to which fail-soft operation does not apply, the PROFINET Coupler Unit will stop IO refreshing
for all of the NX Units even if you enable fail-soft operation.
Causes of Unit Configuration Verification Errors and Error Opera-
tion
Depending on the cause of a Unit Configuration Verification Error, IO refreshing may not start when the
Profinet IO Device Terminal starts even if fail-soft operation is enabled.
Examples are provided below.
Example of Unit configuration information and actual
Unit configuration
information
Actual Case 1
config-
uration
Case 2
Case 3
Case 4
Case 5
Case 6
NX-series PROFINET Coupler Unit User's Manual (W623)
*1
configuration
NX Unit numbers
1 2 3 4
A B C D E
(unmounted)
A B C --- ---
A C D --- ---
A B D C ---
A B C D D
A B C F ---
A B C D E
11 PROFINET Coupler Unit Functions
Description of configuration
5
The following models of Units
are mounted after the PROF-
INET Coupler Unit in the order
given on the left: A, B, C, D, and
E. Unit E, however, has the NX
Unit Mounting Setting set to
Disable.
Unit D is not mounted.
Unit B is not mounted.
Units C and D are mounted in
reverse order.
An extra Unit D is mounted for
NX Unit number 5.
Unit F is mounted for NX Unit
number 4, but it does not exist
in the Unit configuration infor-
mation.
Unit E is mounted for NX Unit
number 5 even though its NX
Unit Mounting Setting is set to
Disable.
Operation when Profinet IO
Device Terminal starts
---
IO refreshing is started for
NX Unit numbers 1, 2, and 3
because fail-soft operation is
enabled.
IO refreshing does not start
for any of the NX Units.
IO refreshing does not start
for any of the NX Units.
IO refreshing does not start
for any of the NX Units.
IO refreshing does not start
for any of the NX Units.
IO refreshing does not start
for any of the NX Units.
11 - 29
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