Omron PROFINET NX-PNC202, User Manual

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11 - 29
11 PROFINET Coupler Unit Functions
NX-series PROFINET Coupler Unit User’s Manual (W623)
11-7 Fail-soft Operation
11
11-7-3 Details on Fail-soft Operation
The following errors are examples of the errors to which fail-soft operation applies.
• Unit Configuration Verification Error
*1
• 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.
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.
Errors to Which Fail-soft Operation Applies
Causes of Unit Configuration Verification Errors and Error Opera-
tion
Example of Unit configuration information and actual
configuration
Description of configuration Operation when Profinet IO
Device Terminal starts NX Unit numbers
1 2 3 4 5
Unit configuration
information
A B C D E
(unmounted) 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 .
---
Actual
config-
uration
Case 1 A B C --- --- Unit D is not mounted. IO refreshing is started for
NX Unit numbers 1, 2, and 3
because fail-soft operation is
enabled.
Case 2 A C D --- --- Unit B is not mounted. IO refreshing does not start
for any of the NX Units.
Case 3 A B D C --- Units C and D are mounted in
reverse order.
IO refreshing does not start
for any of the NX Units.
Case 4 A B C D D An extra Unit D is mounted for
NX Unit number 5.
IO refreshing does not start
for any of the NX Units.
Case 5 A B C F --- Unit F is mounted for NX Unit
number 4, but it does not exist
in the Unit configuration infor-
mation.
IO refreshing does not start
for any of the NX Units.
Case 6 A B C D E Unit E is mounted for NX Unit
number 5 even though its NX
Unit Mounting Setting is set to
Disable .
IO refreshing does not start
for any of the NX Units.