Siemens SIMATIC S7 System Manual page 66

Communication Options
3.5 Communication between F-CPU and F-I/O
Mechanisms in Standard Mode
The mechanisms commonly used in standard automation systems can be used for standard
operation between the CPU and S7-300 fail-safe signal modules. These include:
• Direct access
• Access via the process image
• In CFC, access via channel drivers of the
• Reading out diagnostic data records
Reading Out Diagnostic Data as in Standard Mode
Diagnostic information from fail-safe signal modules ET 200S and ET 200pro, and the
ET 200eco fail-safe I/O module is not relevant for safety. As in standard mode, diagnostic
data record transfers are used to transfer this information to the F-CPU and enter it in the
diagnostic buffer of the F-CPU and F-SMs acyclically.
Diagnostic data can be read out by the user with
• From the diagnostic buffer of the F-CPU and F-SMs
• As slave diagnostics of the ET 200S, ET 200pro and ET 200eco fail-safe modules
• In the standard user program with SFC 59 (F-SMs only)
Reading Out Diagnostic Data in Safety Mode of F-SMs
When F-SMs are operated in safety mode, the diagnostic data records of the F-SMs can
also be read out to the standard user program with SFC 59.
Additional special module diagnostic blocks are available for S7 F/FH systems for this
purpose. These blocks automatically generate messages, for example, to WinCC, and are
used mainly in conjunction with PCS 7 (see
3-12
PCS 7 Drivers
library (S7 F/FH Systems only)
STEP 7
as follows:
Programmable Controllers S7 F/FH
Safety Engineering in SIMATIC S7
System Manual, 04/2006, A5E00109529-05
manual).