Siemens SIMATIC S5-115F - Page 348

S5-115F Manual Rules Governing the Use of the S5-115F
The following flowchart for the control program is an additional aid when using
• I/O ETV 3 with signal group 28
• I/O ETV 4 with signal group 27 or 28.
The term ”subprocess” is used in the flowchart.
Subprocess is here taken to mean part of the auto-
mated system distinguished by its function and including the relevant S5-115F hardware and
software.
Figure 10-41. Flowchart for I/O Error Tolerance Variant 3 (I/O ETV 3) and 4 (I/O ETV 4)
with Signal Group Nos. 27 and 28
no
1 ”I/O error” bit = bit 4 of the error detection byte (1st byte in the error DB)
2 The S5-115F stops or the user makes sure that the relevant part of signal group 27 or 28 is shut down.
3 Set all outputs and inputs of the subprocess to 0 and start the monitoring time with the second error occurrence time.
4 Error in an I/O word which can also be operated in single-channel configuration as a safety-related word (requires
permit)
Examples:
Safety-related, single-channel operation permissible in the case of DQ for cable car main motor in the ”Slow” posi-
tion and under ”Operation with supervision”
Safety-related, single-channel operation not permissible in the case of DI for emergency STOP
5 Failsafe with operator intervention means: safe operator response is guaranteed even if the 2nd channel becomes
defective (proof required)
6 Time less than second error occurrence time (if no STOP response)
OB 1 call
”I/O error”
1
bit = ”1”?
yes
no
2nd error occurrence time elapsed?
no
yes
Error dealt with?
yes
no
STOP or switch
off relevant load
voltage
2
yes
Passivate subprocess
3
no
OB 1 program
End of OB 1
no
Bypassing of defective part
permissible
4
?
Relevant subproc. failsafe
with operat. intervention
5
?
no
yes
Acknowledgement within
programmed time
6
?
yes
Bypassing of defective part
and operation
with supervision
Bypassing of defective part
and operation
without supervision
Error in I/O ETV 4
with signal group 27?
yes
Signal error optically or
acoustically and start second
error occurrence time
EWA 4NEB 811 6148-02 10-65