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External Interface Unit for W
ide Range Temperature Type Safety Control
Unit
The external interface unit for wide range temperature type safety control unit is used when
connecting node fan unit to the safety control unit.
Same as the external interface unit for standard type safety control unit, a temperature sensor
is built-in.
The signals regarding the status of fans are passed to the HKU (House Keeping Unit) in the
processor module.
• Passing the pulse input signals from fans
• Passing control output signals of fan rotation.
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External Interface Unit for IRIG-B
The external interface unit for IRIG-B is optional, it is used for high accuracy synchronization
of SOE (Sequence Of Event). The RS-422 port (connector block) receives the IRIG-B signals
(IRIG-B 000) from GPS, and the IRIG-B signals are converted from RS-422 level to TTL level.
• Cable connection Between GPS and IRIG-B Unit
Connect the wires of RX+ and RX- in the cable to 1 and 2 terminals or to 4 and 5 termi-
nals respectively.
If signal ground (SG) wire is available, connect it to 3 or 6 terminal. Regarding the SG
wire, see the specification of IRIG-B unit.
The shield ground wire of the cable should be connected to the shielding terminal of the
interface unit.
On the safety control unit at the end of the RS-422 cable, a terminator should be connec-
ted to 1 and 2 terminals or 4 and 5 terminals.
4 5 6
1 2 3
RX+ RX-
SG
Terminator
(YCB128)
Figure 4.7-2 Signal Wiring Terminals
<4.7 External Interface Unit > 4-22
IM 32Q06C10-31E 4th Edition : Jan.30,2015-00
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