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I/O terminal blocks, ratings, and
requirements table
Table 2: IOM3733 terminal blocks, functions, ratings, requirements, and cables
Terminal
Terminal block label
label
INn
BINARY INPUT
ICOMn
BINARY OUPUT
OUTn
(External Power Source
Only)
OCOMn
Cable length guidelines for required wire
sizes
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 required wire sizes for low-voltage (<30 V) inputs and outputs
Guideline
Wire size/Gauge and type
1.0 mm (18 AWG) stranded copper
0.8 mm (20 AWG) stranded copper
A
0.6 mm (22 AWG) stranded copper
0.5 mm (24 AWG) stranded copper
1.0 mm (18 AWG) stranded copper
0.8 mm (20 AWG) stranded copper
B
0.6 mm (22 AWG) stranded copper
0.5 mm (24 AWG) stranded copper
See Figure 7 to select wire size/gauge.
C
Use stranded copper wire
Maximum wire length by current and
wire size
Use the following figure to estimate the maximum
cable length relative to the wire size and the load
current (in mA) when wiring inputs and outputs.
This figure applies to low-voltage (<30 V) inputs and
outputs only.
Function, ratings, requirements
Binary Input - Dry Contact Maintained Mode
0.01 second minimum pulse width
Internal 16V, 10K ohm pull up
Binary Input - Pulse Counter/Accumulator Mode
0.01 second minimum pulse width
(50 Hz at 50% duty cycle)
Internal 16V, 10K ohm pull up
Binary Input Common for all Binary Input (IN) terminals
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 Output Common (for OUTn terminal)
Maximum cable length
and type
457 m (1,500 ft) twisted
wire
297 m (975 ft) twisted wire
183 m (600 ft) twisted wire
107 m (350 ft) twisted wire
229 m (750 ft) twisted wire
137 m (450 ft) twisted wire
91 m (300 ft) twisted wire
61 m (200 ft) twisted wire
See Figure 7 to determine
cable length. Use twisted
wire cable.
Determine wire size and
maximum cable length
See Guideline A in Table 3.
See Guideline C in Table 3.
Assumptions
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.
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.
N/A
IOM3733 Input/Output Module Installation Guide
7
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