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

Digital modules
8.3 SM 326; DI 24 x DC 24V
8.3.8 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 the SM 326; DI 24 x DC 24V
digital module for 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 "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
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 for application 6 with single-channel connection of two redundant single-channel
sensors
Two redundant single-channel sensors are required per process signal. One sensor is
connected via one channel to two
(1oo2 evaluation). The sensors can also be connected to an external sensor supply.
Figure 8-18
94
one
sensor to two inputs of the module and you are using the
opposite inputs
Wiring scheme of the SM 326; DI 24 x DC 24V for application 6 – two redundant, single-
channel sensors single-channel connection
of the digital module for each module
Installation and Operating Manual, 01/2010, A5E00085586-10
Fail-safe signal modules