Description
1746-IB32 A-B SLC 500 Digital Input Module(32-Channel)
Product Dimensions：
Product Description (Detailed Explanation)
The 1746-IB32 provides 32 discrete input points in a single-slot module. It operates on a 24V DC Sinking configuration, meaning the module provides a path to the negative common for the field devices.
Due to its high density (32 points in one slot), it does not use a standard removable terminal block. Instead, it features a specialized 40-pin connector on the front, which typically requires a pre-wired cable or a custom interface module (like the Allen-Bradley 1492 series) to facilitate wiring to the field devices.
Product Parameters (Technical Specifications)
| Parameter Category | Specification |
| Number of Inputs | 32 Points |
| Voltage Category | 24V DC Sink |
| Operating Voltage Range | 15V to 30V DC |
| Off-state Voltage (Max) | 5.0V DC |
| On-state Current (Min) | 2.0 mA |
| Nominal Input Current | 5.1 mA at 24V DC |
| Input Delay (Max) | 8 ms (Off-to-On and On-to-Off) |
| Backplane Current (5V DC) | 0.050 A (50 mA) |
| Backplane Current (24V DC) | 0.000 A (External power required for field side) |
Product Advantages (Key Benefits)
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Space Efficiency: By providing 32 points in a single slot, it allows for a smaller physical footprint of the PLC rack, which is ideal for space-constrained control cabinets.
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Cost Reduction: Reduces the number of I/O chassis and power supplies needed by maximizing the density per slot.
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Standardized 24V Logic: Uses the industry-standard 24V DC logic level, ensuring compatibility with a vast majority of industrial sensors and proximity switches.
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Optical Isolation: Features galvanic isolation between the field-side electronics and the backplane, protecting the CPU from electrical surges or noise on the field wiring.
Precautions (Important Notes)
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No RIUP (Removal Under Power): Unlike newer Logix systems, the SLC 500 chassis does not support hot-swapping. You must turn off the rack power before removing or inserting this module.
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Wiring Complexity: Because it uses a 40-pin header rather than screw terminals, you must use compatible 1492-CABLE interface cables. Wiring directly to the pins without a breakout board is prone to errors and physical damage.
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Heat Dissipation: High-density modules generate more heat. Ensure the cabinet has proper ventilation, and follow the manufacturer’s guidelines regarding slot placement and spacing.
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Sinking/Sourcing Identification: This is a Sinking module. Ensure your field devices are wired as “Sourcing” (PNP) to ensure the circuit completes correctly.
Product Applications (Typical Use Cases)
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Material Handling: Monitoring large arrays of photo-eyes and limit switches on conveyor systems.
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Packaging Machinery: Interfacing with high numbers of push-buttons and safety interlocks on automated bagging or bottling lines.
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Automotive Assembly: Collecting status signals from various jigs and pneumatic cylinders across a long production station.
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Modernization Projects: Expanding existing SLC 500 systems where spare rack slots are limited, but more I/O points are required.
Shipping Port: Xiamen, China
Payment: Bank of Chicago, Bank of Singapore
Express cooperation: fedex, DHL, UPS and your express account
Service: Professional Sales provides 24 hours /7 days online service
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