Tools For Configuration And Programming; The User Program; Required Software; Optional Software - Siemens SIMATIC S7-400H Manual

2.4

Tools for Configuration and Programming

Similar to the S7-400, the S7-400H is also configured and programmed with
STEP 7.
After configuration with STEP 7, you treat the S7-400H as a normal S7-400
system.
For you this means that you can use your full knowledge of the SIMATIC S7 and,
for example, only have to take minor constraints into account when writing your
user program. However, there are also fault tolerant-specific additions to the
configuration. Redundant components are monitored by the operating system,
which independently performs switching in the event of a fault. You have already
configured the information required for this in STEP 7 and it is known to the
system.
You will find detailed information on this subject in online Help and in Chapter 9.

Required Software

The optional H package is required for configuration and programming.

Optional Software

All standard tools, engineering tools and runtime software that can be used on the
S7-400 can, of course, also be used on the S7-400H.
2.5

The User Program

The rules applicable to the design and programming of the standard S7-400
system apply similarly to the S7-400H.
The user programs are stored in an identical form in the two central processing
units and are executed simultaneously (event-synchronous).
From the viewpoint of user program execution, the S7-400H behaves in exactly the
same manner as a standard system. The synchronization functions are integrated
in the operating system and run automatically and totally in the background. There
is no need to take these functions into account in the user program.
In order to be able to react to the lengthening of the cycle time due to updating, for
example, a few specific blocks allow you to optimize your user program in this
respect.
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07
S7-400H Installation Options
2-7