Siemens SIMATIC S7-400H Manual page 30

Getting Started
3. Connect the programming device to the first CPU 417-4 H (CPU0). This CPU
should be the master CPU of the S7-400H.
4. A high-quality RAM test is performed after power on. It requires approximately
8 seconds per megabyte of RAM. During this time the CPU cannot be
addressed via the multipoint interface and the STOP LED flashes. If there is a
backup battery, the test will not be performed on further POWER ONs.
5. Perform a memory reset for both CPUs using the mode selector. This applies
the set mounting rack numbers of the synchronization modules to the
operating system of the CPU.
6. Perform commissioning individually for each CPU as described in the S7-400,
M7-400 Programmable Controllers, Hardware and Installation manual. After
loading the program carry out a warm restart: first for the CPU you want as
the master CPU, and then for the standby CPU.
7. Switch the two CPUs of the S7-400H to STOP.
Starting up the S7-400H
To start up the S7-400H, perform the following steps:
1. Open the "HProject" in SIMATIC Manager. The configuration is the same as
the hardware configuration described in "Requirements".
2. Open the hardware configuration of the project by selecting the "Hardware"
object and execute the pop-up menu command Object > Open with the right
mouse button. When you have an identical configuration, you can proceed
with step 6.
3. If your hardware configuration is different from that of the project – for
example, the module types, MPI addresses or DP address – you must adjust
and save the project accordingly. You will find descriptions in the basic help for
SIMATIC Manager.
4. Open the user program in the "S7 program" folder.
The "S7 program" folder is assigned only to CPU0 in the offline view. The user
program can run on the hardware configuration described. It makes the LEDs
on the digital output module light up in the form of a running light.
5. If necessary, modify the user program – to adapt it to your hardware
configuration, for example – and save it.
6. Load the user program into CPU0 with the menu command PLC > Load.
7. Start the S7-400H PLC by switching the mode selector, first for CPU0 and
then for CPU1, to RUN-P.
Result: CPU0 starts up as the master CPU and CPU1 as the standby CPU.
After the link-up and update of the standby CPU the S7-400H switches to the
Redundant system mode and executes the user program (run light on digital
output module).
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S7-400H Programmable Controller Fault-Tolerant Systems
A5E00068197-04