Allen-Bradley 1771-IB DC Input Module
The Allen-Bradley 1771-IB is an 8-point digital DC input module designed for integration into PLC-5 systems. It effectively converts DC signals from user devices into logic levels compatible with the PLC processor, facilitating seamless communication within industrial automation setups.
Key Features
- Input Channels: 8 discrete inputs
- Operating Voltage Range: 10 to 27 V DC
- Voltage Category: 10 to 60 V DC, Sink (Source Load)
- Nominal Input Current: 8 mA at 12 V DC; 24 mA at 24 V DC
- Backplane Current Load: 74 mA
- Maximum Off-State Current: 3.0 mA
- Signal Delay: On = 12 ms (±7 ms); Off = 20 ms (±7 ms)
- Power Dissipation: Maximum 5.7 W
- Thermal Dissipation: Maximum 19.3 BTU/hr
- Dimensions: 3.5 x 6.5 x 2.0 inches (89 x 165 x 51 mm)
- Wiring Arm: Compatible with 1771-WA
Installation and Compatibility
The 1771-IB module is installed in a 1771 I/O chassis containing a PLC processor. Keying bands ensure correct slot placement, located between pins 14 and 16 for the upper connector and between pins 4 and 6 for the lower connector. It is compatible with source-switching devices such as dry-contact switches, electro-mechanical transmitters, and panel-switching devices like selector switches and pushbuttons.
Diagnostic Indicators
The front panel features 8 red status indicators corresponding to each input channel, providing clear visual feedback on the operational status of each input.
Electrical Isolation and Noise Reduction
Equipped with opto-electrical isolation, the 1771-IB module safeguards system circuits from electrical transients. Additionally, input filtering reduces electrical noise, enhancing signal integrity and system reliability.
The Allen-Bradley 1771-IB DC Input Module offers robust performance and reliability, making it a valuable component in industrial automation systems requiring precise DC signal monitoring and processing.
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