Upgrading To A Fault-Tolerant System; Installing And Starting The Fault-Tolerant System - Siemens SIMATIC S7-400H Manual

Upgrading to a fault-tolerant system

Note
Upgrading to a fault-tolerant system is only possible if you have not assigned any
odd numbers for expansion units in single operation.
If you want to upgrade the fault-tolerant CPU later to a fault-tolerant system,
proceed as follows:
1. Open a new project and insert a fault-tolerant station.
2. Copy the complete rack from the standard SIMATIC-400 station and insert it
twice in the fault-tolerant station.
3. Insert the necessary subnets.
4. If required, copy the DP slaves from the old single operation project in the
fault-tolerant station.
5. Reconfigure the communication links.
6. Perform modifications as necessary – by inserting one-way I/O.
The procedure for configuration is described in the online help system of the
add-on package of "S7 H Systems".

Installing and starting the fault-tolerant system

We recommend you to perform the following steps when installing and starting up
the fault-tolerant system.
1. Save the configured H system on a Flash Memory Card or to the engineering
system (ES) when using PCS7.
2. When installing the synchronization submodules, make sure the rack numbers
are set correctly.
3. Do not connect the synchronization submodules with fiber-optic cables.
4. Plug the flash memory card into the central processing unit concerned and start
it. Then the Stop LED flashes (reset request).
5. Perform a manual reset for both central processing units.
6. Now connect the two synchronization modules with fiber–optic cables.
7. Start the two central processing units.
The fault-tolerant system then works in Redundant system mode.
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
Single Operation
B-5