Modifying the System During Operation
11-15
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
Procedure
1. Change the hardware configuration offline (see Section 11.2.2)
2. Stop the standby CPU (see Section 11.2.3)
3. Download the new hardware configuration to the standby CPU (see
Section 11.2.4)
4. If you want to add to the subsystem of the present standby CPU, carry out the
following steps:
– Turn off the power supply for the standby subsystem.
– Plug the new IM460 in the central controller and establish the link to a new
expansion unit.
or
– Add a new expansion unit to an existing line.
or
– Plug in the new external DP master interface, and install a new DP master
system.
– Turn on the power supply for the standby subsystem again.
5. Switch to the CPU with the modified configuration (see Section 11.2.5)
6. If you want to expand the subsystem of the original master CPU (currently in
STOP mode), carry out the following steps:
– Turn off the power supply for the standby subsystem.
– Plug the new IM460 in the central controller and establish the link to a new
expansion unit.
or
– Add a new expansion unit to an existing line.
or
– Plug in the new external DP master interface, and install a new DP master
system.
– Turn on the power supply for the standby subsystem again.
7. Switch to redundant system mode (see Section 11.2.6)
8. Modify and download the user program (see Section 11.2.7)
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