Description
The Allen-Bradley 1756-IB32/B is a high-density digital DC input module from the ControlLogix series, specifically a Series B hardware revision. Engineered for demanding industrial environments, this module provides 32 sinking-type inputs, allowing for the connection of a wide array of field devices including proximity sensors, limit switches, and pushbuttons within a single-slot footprint. It facilitates efficient communication between field instrumentation and the ControlLogix PAC backplane, ensuring reliable data acquisition for complex automation sequences.
Features
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High-Density Architecture: Manages 32 discrete 24V DC inputs in a single chassis slot to optimize space.
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Sinking Input Configuration: Requires field devices to source positive voltage to the module terminal for input activation.
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Group Isolation: Channels are organized into two electrically isolated groups of 16, enhancing system fault tolerance.
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Optimized Signal Conditioning: Integrated optocouplers provide electrical isolation between field wiring and internal controller circuitry.
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Flexible Compatibility: Designed for use with standard 1756-TBCH or 1756-TBS6H removable terminal blocks.
Applications
This module is widely utilized in large-scale manufacturing, process control, and material handling systems where high-density digital I/O is required. Typical deployments include monitoring status signals from machine safety interlocks, conveyor sensors, and various discrete field-side input devices integrated into a ControlLogix rack.
Technical Specifications
| Model |
1756-IB32/B |
| Input Points |
32 (2 groups of 16) |
| Voltage Category |
12/24V DC Sink |
| Operating Range |
10 to 31.2V DC |
| On-State Current |
4.8 mA to 5.5 mA |
| Backplane Power |
120 mA @ 5.1V DC / 2 mA @ 24V DC |
| Power Dissipation |
6.2 Watts (max) |
| Operating Temperature |
0 to 60 degC |
| Weight |
0.23 kg |
Installation Guidelines
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Power Status: Always disconnect chassis power before installing or removing the module to prevent electrical arcing or damage to backplane pins.
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Terminal Blocks: Ensure the compatible 1756-TBCH or 1756-TBSH terminal block is fully seated and secured with the locking latch.
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Wiring: Use shielded cabling for field inputs to minimize EMI; route signal wires separately from high-voltage power lines.
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Grounding: Ensure the ControlLogix chassis is properly bonded to a low-impedance earth ground to maintain signal integrity.
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Electronic Keying: Utilize the Studio 5000 / RSLogix 5000 software to configure electronic keying, ensuring the module matches the project definition for safety and operational consistency.
FAQ
Is this module compatible with Series A systems?
The 1756-IB32/B is a Series B revision. While it is generally backward compatible with ControlLogix backplanes, always verify your specific project configuration in Studio 5000 to ensure the electronic keying settings match the hardware revision.
What terminal blocks are required for this module?
This module requires a 36-pin removable terminal block (RTB). Compatible models include the 1756-TBCH (cage clamp) or 1756-TBS6H/1756-TBSH (spring clamp).
