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4 Digital input multiplexer

The Digital Input Expander allows 4 volt free inputs to be monitored by a single analogue input channel. The resultant analogue value can be decoded by the A to D function module in an BMS controller to produce internal digital status bits for alarm monitoring or other status input applications. Wiring is facilitated by rising cage clamp type terminals, and a supply loop terminal aids wiring to additional modules



expands one analogue input into 4 digital inputs
I or V selectable connected to the controller
monitors digital input signals
standard DIN rail installation
input status LED indicator
easy wiring



Supply voltage :24Vdc or Vac +/- 20%
Supply current :50mA max (I mode)
30mA max (V mode)
Input Channels : 4 volt free contact switch 24Vdc
Input Threshold:
Upper 17.5V max (ON) level
Lower 7.5V min (OFF) level
Distance : Max. distance of IOD4 from controller
25m (I mode)
1000m (V mode)
Output : Mode selectable by link header current/voltage (I/V)
I : 0 to 20mA, max. current 1mA
V : 0 to 10Vdc, max. resistance of load 250Ω
LED : Single LED per input channel, LED on indicates contact closed
Ambient limits:
storage : -10ºC(14 ºF) to +70ºC(158 ºF)
operating : -10ºC(14 ºF) to +50ºC(122 ºF)
humidity : 0 to 90%RH non-condensing


 Order Code

Order code Description
IOD4 4 Digital input multiplexer

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