Overview
The Allen-Bradley 1746-IB32 is a discrete input module purpose-built for the SLC 500 controller family. This 32-point discrete input module features 32 input channels for wiring binary or ON/OFF devices. The module is a 24VDC sinking input module that accepts signal voltage range of 15-30VDC at 50°C and 15-26.4VDC at 60°C. It interfaces electrical devices such as switches, sensors, auxiliary contacts and other binary or ON/OFF devices. This Series D revision is a cost-effective drop-in solution for monitoring discrete field signals in industrial automation systems.
Key Features
- 32 input signals wired via embedded 32 input module channels
- 32 inputs with 8 points per common
- Fast 3 ms signal response for both ON and OFF transitions
- Standard 24V AC/DC LEDs for status indication
- High-density design for limited panel space with electrical fuse protection over external wiring and maximum 2.5A non-replaceable fuse per common
- Complete channel isolation from the backplane, tested at 1500 VAC
- Removable terminal blocks for streamlined wiring and simplified field replacement
Technical Specifications
| Module Type | Discrete 24VDC Sinking Input |
| Input Points | 32 |
| Points Per Common | 8 |
| Nominal Voltage | 24VDC |
| Input Voltage Range @ 50°C | 15–30 VDC |
| Input Voltage Range @ 60°C | 15–26.4 VDC |
| Typical Input Current | 5.1 mA @ 24V DC |
| Signal Delay | 3 ms (both transitions) |
| Backplane Current @ 5V DC | 103 mA |
| Channel Isolation | 1500 VAC |
| Fuse Protection | 2.5A non-replaceable per common |
| Weight | 110–120 grams |
| Origin | Made in Malaysia |
| Series | D |
| Compatible Controllers | SLC 500 Modular processors |
Typical Applications
The 1746-IB32 module is widely deployed in:
- Discrete input signal monitoring from field switches and pushbuttons
- Sensor interface for proximity switches, photoelectric sensors, and limit switches
- Auxiliary contact monitoring from motor starters and control relays
- Binary signal acquisition in packaging, material handling, and process control systems
- Modular SLC 500 systems where local or remote I/O distribution is required
Compatibility & Replacements
Compatible With
- SLC 500 Modular Style processors (local installation)
- SLC 500 expansion I/O racks (local or remote)
- Remote I/O chassis with SLC 500 communication adapters
- Any SLC 500 controller system
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The 1746-IB32 Series D is the direct equivalent to earlier Series revisions of the same model.
Works With
- Allen-Bradley RSLogix 500 programming software
- SLC 500 I/O configuration and ladder logic programming
- Standard 24VDC field devices and sensors
- SLC 500 modular and remote I/O architectures
