Release 7/2009 Ver. 1.0
Technical Manual: GS-120 Light Curtain Systems
TAPESWITCH CORPORATION
Phone: 631-630-0442
100 Schmitt Boulevard
29
Fax: 631-630-0454
Farmingdale, New York 11735
www.tapeswitch.com
3.3.3.2 PNP Version
3.3.3.2.1 Safety Outputs
This version has two 24 Vdc PNP outputs. The two
output signal switching devices (OSSDs) should be
wired to independent switching devices in the machine
control circuit. The OSSDs are solid-state devices and
are internally monitored and short-circuit protected. The
connections for the PNP version of the receiver are
shown in
Figure 31
.
The maximum current is 0.1A.
The output voltage, UA, of each OSSD is dependent on
the supply, UV, and the load which is given by the
following expression:
U
A
> U
V
- 2V
Figure 31- PNP Version Receiver Connections
3.3.3.2.2 Start/Restart and External Device
Monitoring (EDM)
In the PNP mode the GS-120 can be set up for either
manual or automatic start and restart. This function is
determined by the connections to the unit. In manual
mode, the outputs will only switch on when the curtain is
clear and a reset switch is closed and then opened. In
automatic mode the outputs will be on whenever the
curtain is clear and off whenever the curtain is
obstructed.
The GS-120 also has the ability to monitor external
devices. This is achieved by using normally-closed
contacts of the external device and monitoring that they
are closed before allowing the outputs to switch from off
to on. The various wiring configurations for these
options are shown in
Figures 32 to 35
.
Figure 32 – Auto Restart
Figure 33 - Auto Restart with EDM
Figure 34 – Manual Restart
Ground
