4.7 External Interface Unit
The external interface units are applied when the safety control unit is linking with external
signal devices.
n
Configuration
The external interface units include two types: one for standard type safety control unit and
the other for wide range temperature type safety control unit.
The IRIG-B interface unit can be attached as an option to both the standard type and wide
range temperature type safety control unit.
However
, the IRIG-B interface unit cannot be used on the SSC60S/SSC60D, SSC50S/
SSC50D safety control unit for Vnet/IP.
External interface unit for standard type Safety Control Unit
External interface unit for wide range temperature type Safety Control Unit
External interface unit for IRIG-B (optional)
RX+
RX- SG
RX+
RX- SG
CN1
CN1
TM1
Shield connecting screw terminal
Connector for node fan unit
Figure 4.7-1 External Interface Unit
l
External Interface Unit for Standard T
ype Safety Control Unit
The external interface unit for standard type safety control unit is not for connecting any exter-
nal device.
The external interface unit has a built-in internal temperature sensor (thermometer) for moni-
toring the ambient temperature of the safety control unit.
The signals will be converted into the temperature information by the HKU function (House
Keeping Unit) in the processor module.
When the ambient temperature abnormality occurs it can be monitored through the SCS sta-
tus management window on SENG, using the SCS maintenance Support Tools.
SEE
ALSO
For more information about SCS state management window, refer to:
7.1.2, “Inspection by SCS State Management Window” on page 7-5
<4.7 External Interface Unit > 4-21
IM 32Q06C10-31E 4th Edition : Jan.30,2015-00
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