Application: Connecting A Load Per Digital Output, Pm Switching - Siemens SIMATIC S7-1500 Manual

5.2

Application: Connecting a load per digital output, PM switching

Each of the 8 fail-safe digital outputs consists of a P-switch DQ-P
You connect the load between the P-switch and the M-switch. The two switches are always
activated so that voltage is applied to the load. This circuit achieves SIL3/Cat.4/PLe.
The figure below shows an example of the pin assignment of the fail-safe digital output
module F-DQ 8x24VDC/2A PPM with connection of one load per digital output, PM
switching.
To protect the F-module, always install an external fuse with the following properties for the
load circuit: Circuit-breaker 24 V DC/16 A, tripping characteristic type B.
①
Backplane bus interface
②
Microcontroller 1
③
P1 switch for channel groups 0 to 3
Image 5-1 Wiring diagram for 1 relay to 1 F-DQ of the digital output module F-DQ 8x24VDC/2A PPM, PM-switching
mode
Digital output module F-DQ 8x24VDC/2A PPM (6ES7526-2BF00-0AB0)
Manual, 01/2016, A5E03858037-AA
5.2 Application: Connecting a load per digital output, PM switching
WARNING
④
Microcontroller 2
⑤
P1 switch for channel groups 4 to 7
⑥
Reverse polarity protection
Applications of the F-I/O module
and an M-switch DQ-M
n
.
n
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