Siemens S7-300 - Application 6: Safety Mode Sil3;Cat.4;Ple with High Availability (in S7 F;FH Systems Only)

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