Standard Communication - Siemens SIMATIC S7 System Manual

Variables for F-I/O Communication
Certain variables must be initialized by the user at F-channel drivers:
• Variables for acknowledging communication errors and F-I/O or channel faults for
In addition, certain variables can be initialized and evaluated by the user at F-channel
drivers:
• Evaluation of whether the output value represents process data or a fail-safe value
• Setting for automatic or manual reintegration of process data
• Passivation of other F-I/O or channels, for example, for group shutdown of associated
• Display of whether or not an acknowledgment is required for reintegration of F-I/O
• Display of service information (type of fault)
Additional Information
For a detailed description of the variables and how to initialize and evaluate them, refer to
the
3.5.5

Standard Communication

Communication Overview
Figure 3-6
Standard Communication (Standard Mode)
F-I/O can also be used in standard mode for standard applications. This is useful, for
example, if the diagnostic functions provided by the F-I/O are relevant in the standard
application or if flexibility is a priority (F-I/O can be used in both the standard system and the
fail-safe system).
Whether or not standard mode is an option depends on the type of F-I/O used. Only the
S7-300 fail-safe signal modules can be used in standard mode (exception: SM 326;
DO 8 ☓ 24 VDC/2 A). The ET 200S, ET 200pro, and ET 200eco fail-safe modules operate
only in safety mode and never operate in standard mode.
Safety Engineering in SIMATIC S7
System Manual, 04/2006, A5E00109529-05
reintegration of F-I/O
F-I/O
Programmable Controllers S7 F/FH
Standard Communication between CPU and F-I/O
3.5 Communication between F-CPU and F-I/O
manual.
Communication Options
3-11