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Products: AS-B
Functionalities: Hardware
Product version: 3.3, 2022, 2023, 2024

Relay Outputs

arrow1_rotationOutputs arrow1_rotationSpecifications

The relay outputs support digital Form A point types. The Form A relays are designed for direct load applications.

The outputs can be configured as one of the following types:

  • Digital output

  • Digital pulsed output

  • Tristate output

  • Tristate pulsed output

Consider the expected number of operation cycles specified for the relay output (cycle life rating) when configuring the period for a pulse width modulated (PWM) output point.


The DO relay outputs are Form A digital outputs, which means the outputs are normally open contacts with one common terminal (C) and one normally open terminal (NO). The terminals are isolated from other circuits of the device and from signal ground.

action_zoom_plus_stroke Form A digital output internal configuration

Form A digital output internal configuration


Channels, AS-B servers with 24 I/O points
4, DO1 to DO4
Channels, AS-B servers with 36 I/O points
4, DO1 to DO4
Contact rating
250 VAC/30 VDC, 2 A, Pilot Duty (C300)
Switch type
Form A Relay
Single Pole Single Throw
Normally Open
Isolation contact to system ground
3000 VAC
Cycle life (Resistive load)
At least 100,000 cycles
Minimum pulse width
100 ms
  • AS-B Servers
  • AS-B Server Onboard I/O