Product Summary
The Allen-Bradley 1771-IG module converts external DC signals into processor logic levels. This unit requires two power sources for operation. It uses the chassis backplane and a separate 5V DC supply. This design ensures accurate TTL signal processing within your PLC-5 control system.
Expert Technical Evaluation & Performance Review
Engineers value the 1771-IG for its precise TTL voltage handling. The module accepts a strict DC operating voltage range of 5.0 to 5.3 volts. This narrow window ensures compatibility with standard TTL logic families. You must provide a regulated 5V DC customer supply for the signal circuits.
The module delivers reliable signal conversion for high-speed counting. It features a typical on-state signal delay of less than one millisecond. This fast response suits encoder and BCD interface applications. The off-state delay is longer at 20 milliseconds with a +/-9 ms tolerance.
Protection circuits are a key part of the design. The 1771-IG includes optoelectrical isolation on every input channel. This feature shields the processor from harmful electrical transients. An input filtering circuit also reduces the impact of electrical noise. These safeguards improve system stability in harsh factory environments.
This module uses conformal coating on its circuit board. This protective layer guards against moisture, dust, and chemical contamination. The coating extends the operational lifespan of the electronics. You can install the unit in any 1771 I/O chassis slot. Keying bands between pins 34-36 and 4-6 prevent incorrect insertion.
Power management is efficient for this eight-point module. It draws only 122 milliamperes from the chassis backplane. The maximum power dissipation is just 3.3 watts. This low thermal output translates to 11.3 BTU per hour. These specs allow for dense module placement without overheating.
The front panel provides eight status indicator LEDs. These lights show the on or off state of each input channel. This allows technicians to quickly verify signal presence at the module. The 1771-WC wiring arm simplifies module removal for replacement. You can disconnect the wiring arm without removing individual wires.
Logistics & Standard Packaging Details
- One (1) Allen-Bradley 1771-IG Digital DC Input Module
- One (1) 1771-WC Wiring Arm connector assembly
- Manufacturer part number label for identification
We ship all orders via express delivery services. Your order will travel using FedEx, UPS, or DHL. This ensures fast and reliable delivery to your facility.
