Siemens SIMATIC HMI 177 Mode D'emploi page 14

Wiring Examples for Enabling Switch and STOP Button
Introduction
This chapter contains connection examples for enabling and STOP buttons corresponding to Category 3 PL d in accordance
with EN ISO 13849-1:2008/AC:2009.
Note
To ensure Category 3 PL d in accordance with EN ISO 13849-1:2008/AC:2009, be sure to follow the operating instructions
for the monitoring device being used.
The monitoring devices shown in the following examples satisfy Category 4 PL e in accordance with
EN ISO 13849-1:2008/AC:2009.
The monitoring device and downstream components should be taken into consideration when calculating the overall "Stop"
and "Enabling" safety function.
Connection – Enabling button with evaluation device
The following figure shows the connection of an evaluating device to the enabling button of the mobile panel.
All contacts of the safety relay (contactor) KA and KB are fitted with positively-driven contacts in accordance with
EN 50205:2002.
Approval in accordance with EN ISO 13849-1:2008/AC:2009
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A5E02519749-04, 12/2012