3 Installing the Input/Output Module
The ENV climate control system uses one or more input/output modules to interface with the climate
control devices. Currently, the following Modbus-compatible DataNab input/output modules are
certified for use with the ENV system:
Module Analog
Inputs
Analog
Outputs
Digital
Inputs
Digital
Outputs
Pulse
Counter
Comment
Ai8_R13 8
1
8 13
2
Yes
3
A total of 8 universal inputs (analog,
digital, or counter - max. rate is 100
Hz) and 13 Digital Outputs.
AiO8 8
1
8
4
8 No
8 universal inputs (analog or digital)
and 8 analog outputs which can drive
0-10 volt analog devices or external
relays.
Ai32 32
1
32 No 32 universal inputs (analog or digital)
1. Digital input may be a dry contact or an NPN open collector transistor (jumper set to thermistor) or
external voltage (0v=off, 5v =on).
Analog inputs may be directly connected thermistors, 0-5 volts or 0-20 milliamps (internal jumper
selectable per input).
2. Outputs are isolated normally open single pole contacts.
3. Any input can also be a high speed counter in an Ai8_R13 only. Input must be a dry contact or an
NPN open collector transistor - 100Hz maximum.
4. The AiO8 can drive relays for use as a digital output as well as provide a 0-10 volt output.
Installation location
Mount the module in a low-voltage enclosed panel.
Environmental operating range:
• 50º to 99º F (10º to 50º C)
• Relative humidity should be 10% to 90%, non-condensing
Mounting the I/O module
Mount the modules in one of the following ways:
• using a DIN rail (preferred for quick change-outs)
• using four screws and the mounting holes provided on the cover plate
Be sure to leave space either side of the module for wiring.
Connecting power to the I/O module
Each DataNab I/O module consumes about 100 milliamps; take care not to exceed the power supply
rating based on the number of devices plus any auxiliary relays or externally powered sensors that
use the same power.
Power requirement is typically 12 to 24 volts DC or AC.
Note: An Ai08 must be powered with 24 volts DC or AC to achieve full voltage (10 volts DC) on the
analog outputs.
Installation Guide Page 7 of 20 Copyright 2009
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