Application 2: Standard Mode With High Availability, Application 4: Safety Mode Sil2/Cat.3/Pld With High Availability And Application 6: Safety Mode Sil3/Cat.4/Ple With High Availability (In S7 F/Fh Systems Only) - Siemens S7-300 Installation And Operating Manual

8.6.4 Application 2: standard mode with high availability, application 4: Safety Mode
SIL2/Cat.3/PLd with high availability and application 6: Safety mode
SIL3/Cat.4/PLe with high availability (in S7 F/FH Systems only)
Introduction
Below are the wiring scheme and the parameter assignment of SM 326; DO 10 x DC 24V/2A
for
● Application 2: standard mode with high availability
● application 4: Safety mode SIL2/Cat.3/PLd with high availability
● Application 6: Safety mode SIL3/Cat.4/PLe with high availability
Diagnostic messages, possible causes of the problem and their corrective measures are
found in tables in the chapter "Diagnostics messages of SM 326; DO 10 x DC 24V/2A
(Page 152)".
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 for applications 2, 4 and 6
Each process signal requires one actuator which is controlled redundantly by the two digital
modules. The load voltage supply is wired to terminals 2L+/2M, 3L+/3M of the digital module.
Figure 8-47
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
8.6 SM 326; DO 10 x DC 24V/2A (6ES7326-2BF01-0AB0)
Wiring scheme of the SM 326; DO 10 x DC 24V/2A for applications 2, 4 and 6
Digital modules
149