S7 Distributed Safety - Siemens Second Wind Function Manual

Configuration

4.4 S7 Distributed Safety

4.4 S7 Distributed Safety
Introduction
The Mobile Panel 277F IWLAN is used as a peripheral in fail-safe automation systems. Fail-
safe automation system, also referred to as F systems in the following, are used in plants
requiring high levels of safety.
During fail-safe operation, a safety program runs in the F CPU. The HMI device must be
integrated into this safety program.
The HMI device and F CPU communicate via PROFINET IO. They use the safety-related
PROFIsafe protocol as of V 2.0 for fail-safe communication.
Safety-related functions of the HMI device
The fail-safe HMI device performs the following:
● Detects the signal states of the emergency stop button and enabling button
● Sends these signal states to the F CPU in the form of safety message frames
Safety program and F FBs
To operate the HMI device, you need to configure a safety program in STEP 7 with the
"SIMATIC S7 Distributed Safety" add-on package as of V5.4 SP3.
To guarantee availability of the safety functions, you need to use particular fail-safe function
blocks (F FBs) in the safety program.
If you do not use the fail-safe function blocks, the HMI device cannot be integrated in the
safety program of the F CPU. The project on the HMI device cannot be started.
The F FBs are supplied on a CD together with the HMI device.
You can also obtain the F FBs in the Internet at the following address:
"http://www.siemens.de/automation/support"
Additional information
You can find additional information about working with S7 Distributed Safety in the
programmer and operator manual "SIMATIC S7 Distributed Safety - Configuration and
Programming" as well as the online help for S7 Distributed Safety.
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Fail-safe operation of the Mobile Panel 277F IWLAN
Function Manual, 08/2008, 6AV6691-1FQ01-2AB0