Siemens SIMATIC PCS 7 - Page 82

I/O configuration variants
6.7 Connection of two-channel I/O to the PROFIBUS DP interface
CPU 410 Process Automation/CPU 410 SMART
82 System Manual, 05/2017, A5E31622160-AC
The OBs into which you need to link the various blocks are listed in the table below:
Block
OB
FC 450 "RED_INIT"
• OB 72 "CPU redundancy error" (only with fault-tolerant systems)
FC 450 is only processed after start event
B#16#33:"Standby/master switchover by operator"
• OB 80 "Timeout error" (only in single mode)
FC 450 is only executed after the start event "Resume RUN after
reconfiguring"
• OB 100 "Restart" (the administration DBs are recreated, see the
online help)
• OB 102 "Cold restart"
FC 451 "RED_DEPA" If you call FC 451 in OB 83 while inserting modules or in OB 85 dur-
ing alarm output, depassivation is delayed by approximately 3 sec-
onds.
In addition the FC 451 should be executed after the removal of the
error response as specific call in OB 1 and/or OB 30 to 38. The
FC451 only depassivates modules in the corresponding process
image partition.
Depassivation is delayed by 10 s.
FB 450 "RED_IN"
• OB 1 "Cyclic program"
• OB 30 to OB 38 "Watchdog interrupt"
FB 451 "RED_OUT"
• OB 1 "Cyclic program"
• OB 30 to OB 38 "Watchdog interrupt"
FB 452 "RED_DIAG"
• OB 72 "CPU redundancy error"
• OB 82 "Diagnostic interrupt"
• OB 83 "Remove/insert interrupt"
• OB 85 "Program execution error"
FB 453 "RED_STATUS"
• OB 1 "Cyclic program" (fault-tolerant systems only)
• OB 30 to OB 38 "Watchdog interrupt"
To be able to address redundant modules using process image partitions in watchdog
interrupts, the relevant process image partition must be assigned to this pair of modules and
to the watchdog interrupt. Call FB 450 "RED_IN" in this watchdog interrupt before you call
the user program. Call FB 451 "RED_OUT" in this watchdog interrupt after you call the user
program.
The valid values that can be processed by the user program are always located at the lower
address of both redundant modules. This means that only the lower address can be used for
the application; the values of the higher address are not relevant for the application.
Note
Use of FB 450 "RED_IN" and 451 "RED_OUT" when using process image partitions
For each priority class used (OB 1, OB 30 ... OB 38), you must use a separate process
image partition.