Johnson Controls IOM3731 User Manual

I/O wiring ratings and requirements
Table 2: IOM3731 terminal blocks, functions, ratings, requirements, and cables
Terminal block label
Terminal
label
Function, ratings, requirements
Determine wire size and
maximum cable length
Binary Input - Dry Contact Maintained Mode
0.01 second minimum pulse width Internal 18 V, 3k ohm pull
up
INn
Binary Input - Pulse Counter/Accumulator Mode
0.01 second minimum pulse width
(50 Hz at 50% duty cycle)
Internal 18 V, 3k ohm pull up
BINARY INPUT
ICOM n
Binary Input Common for all Binary Input (IN) terminals
Note: All Binary ICOMn terminals share a common,
which is isolated from all other commons, except the
Configurable Output (CO) common (OCOMn) when the
CO is defined as an Analog Output.
See Guideline A in Cable and wire
length guidelines.
OUTn
Binary Output - 24 VAC Triac (External Power)
Connects OUTn to OCOMn when activated.
External Power Source Requirements:
30 VAC maximum output voltage
0.5 A maximum output current
1.3 A at 25% duty cycle
40 mA minimum load current
BINARY
OUPUT(External Power
Source Only)
OCOMn
Binary Output Common (for OUTn terminal)
Note: Each Binary Output common terminal (OCOMn)
is isolated from all other commons, including other
Binary Output commons.
See Guideline C in Cable and wire
length guidelines.
OUTn
Binary Output - 24 VAC Triac (Internal Power)
Sources internal 24 VAC power (24~ HOT)
BINARY
OUPUT(Internal Power
Source Only)
OCOMn
Binary Output - 24 VAC Triac (Internal Power)
Connects OCOMn to 24~ COM when activated.
Internal Power Source:
30 VAC maximum voltage to load
0.5 A maximum output current
1.3 A at 25% duty cycle
40 mA minimum load current
See Guideline C in Cable and wire
length guidelines.
Note: See Cable and wire length guidelines to
determine wire size and cable lenghts for cables.
Cable and wire length guidelines
The following table defines cable length guidelines for the
various wire sizes that may be used for wiring low-voltage
(<30 V) input and outputs.
Table 3: Cable length guidelines for recommended wire sizes for low-voltage (<30 V) Inputs and Outputs
Guideline Wire size/Gauge and type
Maximum cable length
and type
Assumptions
1.0 mm (18 AWG) stranded copper 457 m (1,500 ft) twisted wire
0.8 mm (20 AWG) stranded copper 297 m (975 ft) twisted wire
0.6 mm (22 AWG) stranded copper 183 m (600 ft) twisted wire
A
0.5 mm (24 AWG) stranded copper 107 m (350 ft) twisted wire
100 mV maximum voltage drop
Depending on cable and the connected input or
output device, you may have to define an offset
in the setup software for the input or output
point.
IOM3731 Input/Output Module Installation Guide6

Johnson Controls IOM3731 Specifications

General

Brand	Johnson Controls
Model	IOM3731
Category	Control Unit
Language	English