schmersal PSC1 Series Installation Manual page 51

Installation manual
4.2.1.4.4 Dual-channel sensor with time monitoring and cross-circuit testing
By using two independent test pulse signals on the homogeneous sensor, all cross-circuits
and connections to DC 24 V and DC 0 V can be detected.
PL d or higher according to EN 13849-1 can be achieved on:
- The usage of sensors / switching elements with positive actuation.
- The usage of 2 sensors / switching elements with independent actuation
- Ditto. However with actuation via a common actuating device in conjunction with a fault
exclusion for this device.
X14
I01
I02
I03
I04
.
.
.
I13
I14
T1
T2
X12
T1
T2
L+
L-
Figure: Homogeneous dual-channel sensor with test pulses
Safety instructions:

PL d or higher according to EN ISO 13849-1 is achieved on the usage of switching
elements / sensors with positive actuation

When using sensors with non-positively opening contacts or when using two
independent sensors with independent actuation, the macro (group) "Universal input
module" must be used in SafePLC2.

On the usage of common elements in the actuating chain, a fault exclusion is required
for these elements. The related restrictions and criteria according to EN 13849-1 are to
be met here.
HB-37350-810-01-38F-DE PSC1-C-10 Installation manual V1.1.docx
Version: 38F
Page 51 of 177