Three Channel Input/Output

The Three Channel Input/Output Unit provides three voltage-free, single pole, changeover relay outputs and three monitored switch inputs.

  • Supervises one or more normally open switches on each of the three inputs
  • Loop-powered
  • Capable of switching up to 30V at 1A on each of the three outputs


Operating voltage 17–28V DC
Maximum current consumption at
28V DC no protocol		 LED Enabled
switch-on surge, max 150ms 6.5mA
quiescent, 20kΩ EOL fitted 3mA
Switch inputs closed 6mA
LED Disabled
switch-on surge, max 150ms
 6.5mA
quiescent, 20kΩ EOL fitted
 3mA
Switch inputs closed
 4mA
Maximum continuous current 1A
Maximum switching current 3A
On resistance 0.2Ω
Switch input monitoring voltage
(open-circuit condition)		 9–11V DC
Maximum cable resistance 50Ω
Operating temperature –20°C to +70°C
Humidity (no condensation)
 0–95%
IP rating 54
Dimensions (L x B x H) 250 mm x 175 mm x 75 mm


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