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REF: CCU/IO-485.DOC REV: C June 20, 2000
Appendix B - Supervised inputs on a CCU/IO-485:
1
2
3
4
A
B
C
D
4
3
2
1
D
C
B
A
NO
COM
NC
485-
COM
485+
BAT
COM
+24V
RS232-A
CCU/IO
Connecting inputs to a CCU/IO board.
1
2
12V Supply
1
2
24V Supply
-0V
-0V
+24V
+12V
24V to 12V PSU
330 Ohm
Supervision
Resistor
NC
1
2
Opens on detect
or power loss.
0V IN1
+5V
330 Ohm Transient
Isolation Resistor
IN1
IN2
IN3
IN4
IN5
IN6
IN7
IN8
NC
NC
NC
NC
NC
NC
NC
To RS485 Port A on CCU/485-IO
Normally Closed Contact
220 Ohm
Supervision
Resistor
1
2
Opens on detect
or power loss.
0V
IN1 +5V
Normally Closed Contact
Connection for short runs ( up to 4m )
Connection for longer runs ( over 4m )
Provides greater transient protection.
1K Ohm
Supervision
Resistor
1
2
Opens on detect
or power loss.
910 Ohm Transient
Isolation Resistor
Normally Closed Contact
Alternate connection for longer runs ( over 4m )
Provides greater transient protection.
0V
IN1
+5V
