Rules Governing the Use of the S5-115F S5-115F Manual
Table 10-9. Meaning of the Signal Group Numbers in the Case of Error Tolerance Variants 1 to 4
(Continued)
Response to I/O Error
Signal Group
Number
I/O Error Tolerance
Variant
a
a
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4
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
ANDing
the two signals.
In the case of a discrepancy of two analog input modules,
the passivation value specified in FB 250 is taken.
PLC STOP0
Individual passivation1
(Group) passivation2 to 26
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.
27
28
You adapt the S5-115F system response to your process by taking the following measures
• Define an I/O error tolerance variant for the whole system
• Assign different signal groups when configuring safety-related I/O modules.
Note
The operating system does
not
monitor the intervals between I/O errors and the
second error occurrence time.
• Please note the following in the case of I/O ETV 2 with signal group no. 2 to 28, I/O
ETV 3 with signal group no. 2 to 27 and I/O ETV 4 with signal group no. 2 to 26:
All I/O modules of the relevant signal group are passivated in the relevant signal
group when an I/O error is detected. The first erroneous bit of the I/O word is
entered in the error stack of the error DB.
• Please note the following in the case of I/O ETV 3 with signal group no. 28 and I/O
ETV 4 with signal group no. 27 and 28:
The I/O modules are
not passivated
when an I/O error is detected. The first
erroneous bit of the I/O word is simply entered in the error stack of the error DB.
The error response must be initiated by the user control program.
• If more than sixteen I/O errors with different addresses are entered in the error
stack when using I/O ETV 3 and 4, the system responds with a PLC STOP due to
accumulated errors.
10-58
EWA 4NEB 811 6148-02
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