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

System modifications in operation
14.3 Adding components in PCS 7
14.3.6

PCS 7, Step 6: Transition to redundant state

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 standby CPU, then click "Warm Restart".
Result
The standby CPU links up and is updated. The fault-tolerant system is operating with the
new hardware configuration in redundant 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
Central modules are first reset. Output modules briefly output 0 during this time (instead of the
1)
configured substitute or hold values).
Reaction to monitoring timeout
If one of the monitored times exceeds the configured maximum the update is aborted. The
fault-tolerant system remains in single mode with the previous master CPU and in certain
conditions attempts to perform the link-up and update later. For further information, refer to
section Time monitoring (Page 106).
208
Operating Mode" from the menu.
One-sided I/O of standby
CPU
are configured and
updated by the CPU.
Driver blocks are not yet
present. Any interrupts
occurring are not
reported.
are reconfigured
updated by the CPU.
(see above)
One-sided I/O of master
CPU
are updated by the CPU.
Driver blocks are not yet present. Process or
diagnostics interrupts are detected, but are not
reported.
and continue operation without interruption.
1)
Driver blocks are not yet present. Any interrupts
occurring are not reported.
Switched I/O
System Manual, 09/2007, A5E00267695-03
S7-400H