Programming Device Functions In Step 7; Display In Simatic Manager - Siemens SIMATIC S7-400H Manual

Configuring with STEP 7
9.3

Programming Device Functions in STEP 7

Display in SIMATIC Manager

In order to do justice to the special features of a fault-tolerant station, the way in
which the system is displayed and edited in SIMATIC Manager differs from that of
a S7-400 standard station as follows:
• In the offline view, the S7 program is displayed only under CPU0 of the
fault-tolerant station. No S7 program is visible under CPU1.
• In the online view, the S7 program is displayed under both central processing
units and can be selected in both locations.
Communication functions
For programming device functions that lead to the establishment of an online
connection – for example, downloading and deleting blocks – one of the two CPUs
has to be selected even if the function affects the entire system over the redundant
link.
• Data which are modified in one of the central processing units in redundant
operation affect the other CPUs over the redundant link.
• Data which are modified when there is no redundant link – in other words, in
single mode – initially affect only the edited CPU. The blocks are applied by the
master CPU to the standby CPU during the next link-up and update procedure.
Exception: after a configuration modification no new blocks are applied (only the
unchanged data blocks). Loading the blocks is then the responsibility of the
user.
9-8
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07