HB-37350-810-01-50F-EN PSC1-C-10 Installation manual V2.1.docx Page 81 of 189
Version: 50F
4.3.4.1.2 Single-channel switching relay or semiconductor output with external device for
increasing the switching rating and testing
On the usage of an external device for increasing the switching rating, or downstream
electromechanical, pneumatic or hydraulic components, 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.
In particular, positively driven auxiliary contacts are required for electromechanical devices, or
valve position signal contacts are required for hydraulic or pneumatic components.
The signalling/warning device must immediately make clear the hazardous situation to the
operator.
The achievable PL is heavily dependent on the test rate, a maximum of PL d according to EN
ISO 13849-1 can be achieved!
Q0_P
X21
X12
Q1_N
Q2_P
Q3_N
NC
NC
Y0
Y1
X13
I12
I13
T0
T1
L +
L -
Single-channel switching relay output with testing
Safety instructions:
Only recommended to a limited extent for safety applications! On this topic see also the
information in EN ISO 13849-1 on usage and the fault exclusions necessary.
For PL c or higher a test rate > 100 * demand rate is required
For PL c and higher a signalling/warning device is required that immediately makes
clear the hazardous situation to the operator
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