Pcs 7, Step 6: Transition To Redundant System Mode - Siemens SIMATIC S7-400H System Manual

17.3.6

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 >
2. From the "Operating Mode" dialog box, select the reserve CPU, then click "Warm
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
Added I/O
modules
I/O modules still
present
Added DP stations as for added I/O modules
1) 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).
S7-400H
System Manual, 03/2012, A5E00267695-11
Operating Mode" from the menu.
Restart".
One-sided I/O of reserve
CPU
are given new parameter
settings and updated by
the CPU.
Driver blocks are not yet
present. Any interrupts
occurring are not
reported.
are given new parameter
settings
the CPU.
(see above)
One-sided I/O of master
CPU
are updated by the CPU.
Driver blocks are not yet present. Process or
diagnostic interrupts are detected, but are not
reported.
continue operation without interruption.
and updated by
1)
Driver blocks are not yet present. Any interrupts
occurring are not reported.
System modifications during operation
17.3 Adding components in PCS 7
Switched I/O
291