System modifications during operation
17.4 Removing components in PCS 7
S7-400H
300
System Manual, 03/2012, A5E00267695-11
17.4.6
PCS 7, step 6: Transition to redundant system mode
Starting situation
The fault-tolerant system is operating with the new hardware configuration in single mode.
Procedure
1.
In SIMATIC Manager, select a CPU of the fault-tolerant system, then choose "PLC >
Operating Mode" from the menu.
2.
From the "Operating Mode" dialog box, select the reserve CPU, then click "Warm
Restart".
Result
The reserve CPU links up and is updated. The fault-tolerant system is operating with the new
hardware configuration in redundant system mode.
Reaction of the I/O
Type of I/O
One-sided I/O of reserve
CPU
One-sided I/O of master
CPU
Switched I/O
I/O modules to be
removed
1)
are no longer addressed by the CPU.
Driver blocks are no longer present.
I/O modules still
present
are given new parameter
settings
2)
and updated by
the CPU.
continue operation without interruption.
DP stations to be
removed
as for I/O modules to be removed (see above)
1) No longer included in the hardware configuration, but still plugged in
2) Central modules are first reset. Output modules briefly output 0 during this time (instead of the
configured substitute or hold values).
Reaction to monitoring timeout
If one of the monitored times exceeds the configured maximum, the update is canceled. The
fault-tolerant system remains in single mode with the previous master CPU and, assuming
certain conditions are met, attempts the link-up and update later. For additional information,
refer to section Time monitoring (Page 155).
