AO-3 Analog Current Output – 4-Channel I/O Module

Features:

The AO-3 provides four current output channels that use 12-bit digital to analog converters (DAC). The AO-3 also provides open loop detection.

This module provides two output ranges. The default range is 4 to 20 mA with user data scaled so that a count of 0 corresponds to 4 mA and a count of 32760 corresponds to 20 mA. A range link (on the rear of the module) selects either 4-20 mA or 0-20 mA for all four channels. The default condition is 4-20 mA with the link on. The module provides 12 bits of resolution in either range.

Overview

  • 12 bit resolution
  • 3 kV field to logic isolation
  • Open loop detection
  • 0 - 20 or 4 - 20 mA outputs
  • 3 kV channel group to channel group isolation

Order Information

  • AO-3-1 (Analog Output - 4 channel, 12 bit resolution) 
AO-3 Analog Output Module Specifications
Output Current Range 4 to 20 mA [default] or 0 to 20 mA (loop current is supplied by module)
Outputs per Module 4
Output Power Isolated 24 VDC @ 40 mA for outputs 1 & 2
Isolated 24 VDC @ 40 mA for outputs 3 & 4
Supply Voltage (nominal) +5 VDC and +12 VDC from backplane
Update Rate 250 ms (all channels) Determined by I/O scan time and is application dependent
Resolution 12 bit (no sign bit)
Accuracy ± 0.2% @ 25 °C
± 0.5% @ -20 to 70 °C
Load Resistance 0 to 850 Ω
Load Capacitance, max 2000 pF
Load Inductance, max 1 H
Isolation Analog outputs 1 & 2 and analog outputs 3 & 4 form two groups. Each group is isolated from the other group and from the backplane logic. There is no isolation between outputs 1 & 2 and no isolation between outputs 3 & 4.
  • Transient voltage (Group to Group and Group to Logic): 3 kV
  • Maximum working voltage in respect to system earth/ground must not exceed SELV limits (42.4 Vpeak / 60 VDC)
Operating Temperature -20 to 70 °C
Storage Temperature -40 to 85 °C
Operating Humidity 5 to 90% RH non-condensing
Hot Swap Yes. Module can be swapped while RTU is running. Hot swap will not cause a Warm Start. Outputs will be restored within 2 seconds once module is replaced.
Open Loop Detection Yes. Monitors output circuit for failure (e.g. cable breakage) or if the load is disconnected.
Note: when using the 0-20 mA range, Open Loop Detection cannot be guaranteed on an output when set below 160 / 0.1 mA / 0.5%.
AO-3 Analog Current Output 4-Channel I/O Module

AO-3 Analog Current Output 4-Channel I/O Module