Siemens S7-300 - Application 1: Safety Mode Sil2;Cat.3;Pld and Application 2: Safety Mode; Sil3;Cat.4;Ple

Digital modules
8.5 SM 326; DO 8 x DC 24V/2A PM
Fail-safe signal modules
Installation and Operating Manual, 01/2010, A5E00085586-10
131
8.5.3 Application 1: Safety Mode SIL2/Cat.3/PLd and application 2: Safety mode
SIL3/Cat.4/PLe
Introduction
Below are the wiring scheme and the parameter assignment of SM 326;
DO 8 x DC 24V/2A PM for
● application 1: Safety mode SIL2/Cat.3/PLd
● Application 2: 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 of SM 326; DO 8 x DC 24V/2A PM
(Page 133)".
Wiring scheme of applications 1 and 2
Each one of the 8 fail-safe digital outputs consists of one DOx P-switch (current source) and
one DOx M-switch (current consumer); connect the load between the P and M switches.
/
0
/
0
'2[3
'2[0
60
'2['&9$30
Figure 8-37 Wiring scheme of the SM 326; DO 8 x DC 24V/2A PM for applications 1 and 2