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

System modifications in operation
14.5 Adding components in STEP 7
14.5.7

STEP 7, step 7: 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
Central modules are first reset. Output modules briefly output 0 during this time (instead of the configured substitute or
1)
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, assuming
certain conditions are met, attempts to the link-up and update later. For further information,
refer to section Time monitoring (Page 106).
224
Operating Mode" from the menu.
One-sided I/O of standby CPU One-sided I/O of master CPU
are given new parameter
settings and updated by the
CPU.
The output modules
temporarily output the
configured substitution values.
are given new parameter
settings and updated by the
1)
CPU.
as for added I/O modules (see
above)
are updated by the CPU.
continue operation without interruption.
are updated by the CPU.
Switched I/O
are updated by the CPU.
Generate insertion interrupt;
must be ignored in OB 83.
System Manual, 09/2007, A5E00267695-03
S7-400H