Siemens S7-300 - Application 5: Safety Mode Sil3;Cat.4;Ple

Digital modules
8.3 SM 326; DI 24 x DC 24V
Fail-safe signal modules
90 Installation and Operating Manual, 01/2010, A5E00085586-10
Parameters Range of values in safety mode Type Effective range
Redundant module (selection of an existing additional
module of the same type)
static redundant module
pair
Discrepancy time 10 ms to 30000 ms static redundant module
pair
* Vs does not clock, if the short-circuit test is deactivated.
8.3.7 Application 5: Safety mode SIL3/Cat.4/PLe
Introduction
Below are the wiring scheme and the parameter assignment of the SM 326; DI 24 x DC 24V
digital module 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 of SM 326; DI 24 x DC 24V (Page 99)".
Wiring of sensors when using the internal sensor supply of the module
Note
In general, if you connect
one sensor to two inputs of the module and you are using the
module-internal sensor supply, you must always use the sensor supply of the left half of the
module 1Vs (pin 4) or 2Vs (pin 11).
Wiring scheme of application 5 with single-channel connection of one sensor
One sensor is connected via one channel to each of two opposite inputs of the digital module
for each process signal (1oo2 evaluation). The sensors can also be connected to an external
sensor supply.
/

0

',

',

9V

60
',['&9
OHIW&KDQQHOVWR
5LJKW&KDQQHOVWR
Figure 8-13 Wiring scheme of the SM 326; DI 24 x DC 24V for application 5 – one sensor single-
channel connection
WARNING
To achieve SIL3/Cat.4/PLe using this wiring, you must use a suitably qualified sensor.