schmersal PSC1 Series Installation Manual page 81

Installation manual
4.3.5.2.2 Single-channel circuit with testing
On the usage of a dual-channel output (IQQx) in combination with an external single-channel
circuit with testing. In particular, positively driven auxiliary contacts are required for
electromechanical devices, or valve position signal contacts are required for this purpose for
hydraulic or pneumatic components. A signalling/warning device for the indication of the failure
is required. The signalling/warning device must be 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
13849-1 can be achieved!
X21
IQQ03
IQQ04
IQQ05
IQQ06
X12
IQQ01
IQQ02
T1
T2
X13
NC
NC
Y1
Y2
L +
L -
Figure: Dual-channel output with single-channel circuit with testing
Safety instructions:

Only recommended to a limited extent for safety applications! On this topic see also the
information in EN 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
HB-37350-810-01-38F-DE PSC1-C-10 Installation manual V1.1.docx
Version: 38F
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