Supplementary information
18.6 Programming device functions in STEP 7
CPU 410 Process Automation/CPU 410 SMART
308
System Manual, 05/2017, A5E31622160-AC
18.6
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 visualized and edited in SIMATIC Manager differs from that of a S7-400 standard
station as follows:
●
In the offline view, the S7 program appears only under CPU0 of the fault-tolerant station.
No S7 program is visible under CPU1.
●
In the online view, the S7 program appears under both CPUs and can be selected in both
locations.
Communication functions
For programming device (PG) functions that establish online connections (e.g., downloading
charts), one of the two CPUs has to be selected even if the function affects the entire system
over the redundant link.
●
Data which is modified in one of the central processing units in redundant operation affect
the other CPUs over the redundant link.
●
Data which is modified when there is no redundant link (i.e. in single mode) initially affects
only the processed CPU. The blocks are applied by the master CPU to the reserve CPU
during the next link-up and update. Exception: No new blocks are applied after changing
the configuration. Loading the blocks is then the responsibility of the user.
18.7
Communication services
18.7.1
Overview of communication services
Overview
Table 18- 4 Communication services of the CPUs
Communication service
Functionality
Allocation of S7 connection
resources
Via DP
Via
PN/IE
PG communication
Commissioning, testing, diagnostics
Yes
Yes
Yes
OP communication
Operator control and monitoring
Yes
Yes
Yes
S7 communication
Data exchange via configured connec-
tions
Yes
Yes
Yes
Routing of PG functions
For example, testing, diagnostics be-
yond network boundaries
Yes
Yes
Yes
PROFIBUS DP
Data exchange between master and
slave
No
Yes
No