MDD 121-1
Page 44 10.03.2021
4.5 Example: Safety PLC Application
To meet the requirements of safety category 4, performance level "e" for EN 13849-1 and
SIL 3 according to EN 62061, an error-proof output of a safety PLC must be used.
There are two Types of error-safe outputs.
1. A simple error-safe output, which functions based on "Ext. GND" only. This is then
connected to the ENABLE_H input.
The wiring for both connections must be provided with protective insulation (to
avoid the "external voltage supply" error).
In this case, ENABLE_L is connected to "Ext. GND"
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