schmersal PSC1 Series Installation Manual page 74

Installation manual
4.3.4.1.3 Single-channel switching relay or semiconductor output with dual-channel external
circuit with testing
For safety applications from PL c according to EN ISO 13849-1 it is recommended or required
to operate two external shutdown elements. In addition, a device for testing the complete chain
and a signalling/warning device on the detection of a fault are required to achieve PL c or
higher – see comments in 4.3.4.1.2.
X21
Q1_PP
Q2_PN
Q3_PP
Q4_PN
X12
I13
I14
T1
T2
X13
NC
NC
Y1
Y2
L +
L -
Figure: Single-channel switching output Q0_P with dual-channel external circuit and monitoring
on input 13 as collective feedback
The two external monitoring contacts are connected in series, supplied with pulse signal P1
and read via input 13. Input 13 was used as the readback input, however it is also possible to
use any another input.
HB-37350-810-01-38F-DE PSC1-C-10 Installation manual V1.1.docx
Version: 38F
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