14 Discrete I/O Modules
Publication 1746-IN005A-US-P
Careful wire routing within the enclosure helps cut down electrical noise between
I/O lines. Refer to the SLC 500 Modular Hardware Style Installation and
Operation Manual, publication 1747-6.2, for recommended wiring procedures
for TTL modules.
Cable Length - Limit cable length to 15 meters (50 feet) per point for inputs in
standard environments. Refer to Allen-Bradley Programmable Controller Wiring
and Grounding Guidelines, publication 1770-4.1, for complete information.
Table 9: Specifications for Input Module 1746-IG16
Specification 1746-IG16
(1)
(1)Removable Terminal Block.
Voltage Category 5V dc TTL Signal Input (sourcing)
Number of Inputs 16
Points per Common 16
Operating Voltage
4.5 to 5.5V dc (sourcing)
50 mV peak to peak ripple (max.)
Backplane Current
Consumption
5V dc 0.140A
24V dc 0.0A
Signal Delay (max.)
on = 0.25 ms
off = 0.50 ms
Off State Voltage (max.)
2.0V dc
(2)
(2)TTL inputs are inverted (-2.0 to +0.8V dc = low voltage = True = ON). Use a NOT
instruction in your ladder program to convert to traditional True = High logic.
Off State Current (max.) 4.1 mA
Nominal Input Current at 5V dc 3.7 mA
!
ATTENTION: To avoid potential damage to TTL modules,
handle them by the ends of the module, not metallic surfaces.
Electrostatic discharges can damage the module. Care should be
taken to prevent exposure of terminals or components to
electrostatic charges.
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