schmersal PSC1 Series Installation Manual page 50

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 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.
X14
I00
I01
I02
I03
.
.
.
T0
T1
X12
T0
T1
L+
L-
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
(Please refer to SafePLC2 manual 12.3.2)
•
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.
PSC1-C-10 Installation manual V2.7
Version: 57E
Page 50 of 174