schmersal PSC1 - Page 55

Installation manual
HB-37420-810-01-25F-EN PSC1-C-100 Installation manual - V2.2.docx Page 55 of 201
Version: 25F
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 ISO 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.
I00
I01
I02
I03
T0
T1
X14
.
.
.
L+
L-
T1
T0
X12
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 positive break contacts or two independent sensors with
independent actuation, the "Universal input module" macro (group) 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 ISO 13849-1
are to be met here.