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S5-115F Manual
10.17 Responding to I/O Module Errors
To increase the availability of the S5-115F, the operating system does not necessarily respond to
I/O module errors with PLC STOP. The user can define system response to I/O errors himself. There
are four I/O error tolerance variants (I/O ETVs) available for this purpose:
I/O ETV 1
I/O ETV 2
I/O ETV 3 and I/O ETV 4 Possibility of initiating responses to I/O errors via the user program.
Signal group numbers are used to further differentiate between I/O errors. You can assign
technologically-related modules to a signal group with a programmable signal group number.
You adapt the system response of the S5-115F to your process as follows:
•
Define an I/O error tolerance variant for the overall system
and
•
Assign different signal groups when configuring the safety-related I/O modules. The signal
numbers must lie within the range 0 to 28.
Table 10-9. Meaning of the Signal Group Numbers in the Case of Error Tolerance Variants 1 to 4
I/O Error Tolerance
Variant
1
2
3
EWA 4NEB 811 6148-02
All I/O module errors result in PLC STOP
Possibility of shutting down technologically-related modules via the ope-
rating system
Signal Group
Number
Not required
0
1
8-bit, 16-bit DI /DQ
2 to 28
All modules of a given signal group are passivated.
0
1
2 to 27
28
Rules Governing the Use of the S5-115F
Response to I/O Error
PLC STOP
PLC STOP
Individual passivation
Passivation of the module
32-bit DI
Passivation of a word (16 bit)
AI/AQ
Passivation of a channel
(Group) passivation
PLC STOP
Individual passivation
(see I/O ETV 2 signal group 1)
(Group) passivation
(see I/O ETV 2 signal group 2 to 28)
Error message from the operating system
and
safety response from the user program
and
organizational measures
(e.g. supervised operation)
Standard values in the case of discrepant two-channel
digital signals are generated by ORing the two signals.
In the case of a discrepancy of two analog input modules,
the passivation value specified in FB 250 is taken.
10-57
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