Siemens ST950 Plus+ - Page 62

ST950 Plus+ User Manual
ST950 Plus+ User Manual
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667/HE/53000/000
Issue 2
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3.16.7 CIC/CTB Interfaces: Lamp Supply
PL20 provides an optional connection to an Outstation Monitoring Unit (OMU), where the OMU
can monitor whether the signals (Lamps) are on or off. The 24V output from the CIC/CTB will
normally drive an external relay (e.g. mounted on DIN-rail on a rear panel) with the relay switching
a voltage which is capable of driving the OMC lamp supply input.
The connection detail is as follows:
3.16.8 CIC/CTB Interfaces: Passive Safety Auxiliary Supply Control (Not Currently
Used)
This interface provides for the control of an optional Passive Safety Relay. This relay may be used
to isolate the power to auxiliary equipment during a passive safety event.
The connection detail is as follows:
3.16.9 CIC/CTB Interfaces: Digital Input
This two-way connector provides for an optional digital input. This may be used for connection to
switches such as a door alarm switch.
Pin
Legend
Function
1
+24V OUT
+24V to the OMU Input Positive / positive of
relay coil (if required)
2
LAMPS ON
Open Drain Output for connection to the
OMU input / negative of relay coil
Pin
Legend
Function
1
+24V OUT
+24V to the Positive of the Relay Coil
2
Aux PS D
Open Drain Output for connection to
Negative of the Relay Coil
3
NC
No Connection
Pin
Legend
Function
1
GP I/P
For connection to one switch contact.
2
GND
For connection to the other switch contact.