Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 1746-IB8 (1746-IB8/A, Series A) |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | SLC 500 Digital DC Input Module |
| Product Series | SLC 500 |
| Input Channels | 8 |
| Input Type | Current Sinking (Sink) |
| Voltage Category | 24V DC |
| Operating Voltage Range | 10…30V DC |
| Points Per Common | 8 |
| Backplane Current (5V DC) | 50 mA |
| Backplane Current (24V DC) | 0 mA |
| Nominal Input Current | 8 mA at 24V DC |
| Off-State Voltage (Max) | 5.0V DC |
| Off-State Current (Max) | 1 mA |
| Signal Delay (On) | 8 ms max |
| Signal Delay (Off) | 8 ms max |
| Power Dissipation | 1.3W (total) |
| Operating Temperature | 0…60 °C |
| Weight | 0.20 kg (0.44 lbs) |
| Certifications | UL, CE, Class 1 Division 2 hazardous locations |
Main Features and Advantages
Eight-Point Sinking Input Configuration: The 1746-IB8 provides eight independent sinking input channels in a single-width SLC 500 module format. All eight points share a single common terminal, simplifying field wiring for installations where multiple input devices are referenced to the same potential . The 1746-IB8 accepts 10 to 30V DC signals, providing compatibility with standard 24V DC industrial sensors and pilot devices without requiring external signal conditioning.
Comprehensive Isolation and Noise Immunity: The 1746-IB8 features 1500V AC dielectric withstand between the backplane and input circuits, with 500V isolation on communication circuits . This isolation protects the SLC 500 processor from field-side voltage transients and ground potential differences, ensuring reliable signal integrity in electrically noisy industrial environments. The module’s optical coupling and filter circuitry provide additional signal noise reduction, a standard feature across SLC 500 discrete I/O modules .
Chassis-Based Modular Integration: As a chassis-mounted SLC 500 I/O module, the 1746-IB8 installs directly into any SLC 500 I/O chassis slot alongside the processor or communication adapter . This modular architecture allows system integrators to mix the 1746-IB8 with other input, output, and specialty modules in the same chassis, tailoring the I/O configuration to specific application requirements. The SLC 500 system supports up to three chassis with 30 I/O modules connected to a single controller, providing significant I/O expansion capacity .
Proven Legacy Platform Support: Although discontinued, the 1746-IB8 remains a critical spare component for the extensive installed base of SLC 500 control systems in manufacturing, process control, and infrastructure applications. The module’s stable, well-documented design and widespread availability in the secondary market make the 1746-IB8 a practical choice for maintaining legacy automation assets without requiring full system migration .
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