Application 5: Safety Mode Sil3/Cat.4/Ple - Siemens S7-300 Installation And Operating Manual

8.7.4

Application 5: Safety mode SIL3/Cat.4/PLe

Introduction
Below are the wiring scheme and the parameter assignment of SM 326; F-DO 10 x DC
24V/2A PP for
● Application 5: Safety mode SIL3/Cat.4/PLe.
Diagnostic messages, possible causes of the problem and their corrective measures are
found in tables in the chapter "Diagnostic messages SM 326; F-DO 10 x DC 24V/2A PP
(Page 173)".
Note
In case of parameter setting with SIL3
The signal at the output has to change daily or even more frequently. If this is not the case
with the "0" signal, you will have to activate the light test that meets this condition.
Wiring scheme of application 5
Single-channel connection of one sensor for each process signal. The load voltage supply is
wired to terminals 2L+/2M, 3L+/3M of the digital module.
Figure 8-57
It is no longer possible to shut down an actuator if a cross circuit has developed between
2L+ and DO. To prevent cross circuits between 2L+ and DO, you must route the cables
used to connect the actuators in a cross-circuit-proof manner (for example, as separate,
sheathed cables or in separate cable ducts).
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
Wiring scheme of the SM 326; F-DO 10 x DC 24V/2A PP for application 5
WARNING
8.7 SM 326; F-DO 10 x DC 24V/2A PP (6ES7326-2BF10-0AB0)
Digital modules
167