Fail-Safe Operation - Siemens SIMATIC HMI Operating Instructions Manual

Overview

1.6 Fail-safe operation

Zones
In addition to the effective ranges you can define zones in your system. The zones are not
relevant for fail-safe operation. They are used merely to control the project depending on the
location of the operator. For example a picture change can be configured for zone entry or
zone exit.
Zones and effective range are independent of each other.
See also
Division of the system into effective ranges and zones (Page 58)
1.6 Fail-safe operation
Configuration tools and add-on packages
For fail-safe operation of the HMI device, the following software is required:
● STEP 7 V5.4 as of SP2
● SIMATIC S7 Distributed Safety as of V5.4 SP3
● WinCC flexible 2007
Fail-safe automation system
Fail-safe automation system (F systems) are used in plants requiring higher levels of safety.
F systems control processes in such a way that a safe state is achieved in every situation.
An immediate shutdown therefore does not pose a danger to people or the environment.
Fail-safe application of the HMI device
The Mobile Panel 277F IWLAN is a PROFINET IO device on Industrial Ethernet.
During fail-safe operation, the HMI device registers the signal states of the emergency stop
button and enabling button, and transmits corresponding safety message frames to the CPU.
The CPU and HMI device communicate with each other via the PROFIsafe fail-safe protocol.
The HMI device can operate in fail-safe mode conforming to SIL3/Ple/Cat. 4 if the safety
functions are appropriately configured in STEP 7 with the "S7 Distributed Safety" option
package.
To guarantee availability of the safety functions, particular fail-safe function blocks (F-FBs)
must be used in the safety program. The F-FBs are supplied on a CD together with the HMI
device.
Diagnostics function of the HMI device
HMI device diagnostics conforming to PROFINET IO standard IEC 61784-1:2002 Ed1 CP
3/3 are available for the standard application.
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Mobile Panel 277F IWLAN
Operating Instructions, 12/2007, A5E01003940-01