Installation and Operations Guide
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Hardware installation
© Honeywell. All Rights Reserved. LT-VLXEXPAXMIOG Rev. 01
35
Analog outputs (AOs)
AOs provide an electrical output signal in response to a software control signal
of 0–100. For EXPs/AXMs with AOs, the AO is configured with DIP switches
to provide either a current (0–20 mA) or voltage (0–10 VDC) output.
Universal inputs (AIs, BIs)
Universal inputs on EXPs/AXMs can accept a variety of input types. Typically, a
sensor, transducer, or other device produces an output signal that is wired to an
input terminal on the EXP/AXM. All EXP/AXM inputs are set up with jumpers.
Inputs on the EXP/AXM can be configured to accept:
• Resistance (10 K Ohm or 3 K Ohm thermistors or potentiometers)
• Voltage (0–10 VDC, 0–5 VDC)
• Current (4–20 mA)
• Dry contact
• Solid-state (transistor) switch
• Pulse-type inputs (IN-1, IN-2, and IN-3 only)
All inputs require software configuration. See “Setting up inputs” on page 53 for
details.
Terminal identification Terminals labeled AO n connect to the positive
side of an analog load. The immediately adjacent
COM terminal connects to the negative side.
Cable Use 18 AWG, shielded, twisted-pair wire for all
AO connections.
Shield grounding Ground only the EXP/AXM side of the cable
shield to panel ground.
Do not ground both sides of the shield.
Differences in ground potential may exist from
one end to the other and cause current on the
shield.
DIP switch settings The DIP switch bank for AO configuration is
beneath the EXPs/AXMs hinged cover doors and
labeled “AOs.” DIP switch numbers correspond
directly to AO numbers. DIP 1 corresponds to
AO-0, DIP 2 to AO-1, and so on. Additional DIP
switches may be present and are unused. Set a
DIP switch to the ON position for 0–20 mA, OFF
for 0–10 VDC.
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