Product overview
1.2 Using Fail-Safe Signal Modules
Fail-safe signal modules
16
Installation and Operating Manual, 01/2010, A5E00085586-10
Operation in safety mode with parameter setting "Keep last valid value" with digital output modules
You can only operate the SM 326; F-DO 10 x DC 24V/2A PP with parameter setting "Keep
last valid value" according to EN54-2/-4 or NFPA72. Configure safety mode in
HW Config of
STEP 7 and using the address selector switch on the rear panel of the fail-safe signal
module. The "SAFE" LED is lit when safety mode is active at the signal module.
For more information, refer to the chapter entitled " Reactions to Faults in Safety Mode
(Page 52) " and " Fault reactions in safety mode with parameter setting "Keep last valid
Safety Integrity Levels supported
The fail-safe signal modules feature integrated safety functions for operation in safety mode.
The section below outlines the Safety Integrity Levels that can be achieved in safety mode
through assignment of the safety function parameters in
STEP 7 using the optional package
S7 Distributed Safety or S7 F Systems, and by specific arrangement and wiring of the
sensors and actuators:
Table 1- 4
Safety Integrity Levels that can be achieved in safety mode
Safety Integrity Level in safety mode *
According to IEC 61508
According to EN 954-1
According to
ISO 13849:2006
SIL 2
Category 3
(PL) Performance Level d
SIL 3
Category 4
(PL) Performance Level e
* Valid only if "Keep last valid value" was not set with parameters in digital output modules.
Enhanced availability in standard and safety mode
You can enhance availability by means of redundant operation of the F-SMs fail-safe signal
modules in
standard mode (exception: SM 326; DO 8 x DC 24V/2A PM, SM 326; F-
DO 10 x DC 24V/2A PP and SM 336; F-AI 6 x 0/4 ... 20 mA HART).
In safety mode, you can operate the F-SMs redundantly in S7 F/FH Systems F-systems
(with the exception of SM 326; DO 8 x DC 24V/ 2A PM).
Options of inserting redundant signal modules, depending on availability requirements (for
example configurations, refer to "Safety Engineering in SIMATIC S7, System Description
(
Separately in two ET 200M distributed I/O devices
●
In the same ET 200M distributed I/O device
Software requirements of redundant operation of F-SMs are described in the chapter
Содержание Simatic S7-300
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