Hitachi Central Station EX Installation Manual page 16

● Connecting External Devices
NOTES:
1. External input circuit is pulled up to DC24V in Central Station EX. On the wire between Central Station EX and
external device, the maximum current from Central Station EX is 10mA.
Pulse width and pulse interval need to be 90 ms or longer for use with pulse input.
2. When connecting to external output, apply relay with following specifications.
- Rated voltage: 24VDC
- Rated current: 40mA or less
3. To set voltage contact for external output, set DSW2 for external output setting to ON.
4. 4 COM terminals can be used for both input and output. (They conduct with each other internally)
<How to wire>
14
External Input
IN1 COM IN2 IN3 COM IN4
Contact Input A
Fig. 6.1 How to Wire External Devices
External Output External Output
(dry contact setting) (wet contact setting)
OUT1 OUT2
COM (+) (–) (+) (–)
– –
RY RY
+ +
24VDC
OUT1 OUT2
COM (+) (–) (+) (–)
+ +
RY RY
– –
A12124820A