Product Overview
The Allen-Bradley 1746-IG16 is a SLC 500 Digital DC TTL Input Module engineered for precise TTL and BCD signal interfacing. This module provides sixteen (16) input channels with a voltage range of 4.5-5.5 Volts DC, making it an essential component for control systems that require reliable digital input handling. Designed to occupy a single slot in the SLC 500 chassis, the 1746-IG16 integrates seamlessly into existing setups.
As a current sourcing transistor-transistor logic (TTL) input module, the 1746-IG16 ensures accurate signal detection from electronic devices. Its robust construction and certified safety ratings make it a dependable choice for industrial automation environments.
Technical Specifications
Below are the key technical specifications for the Allen-Bradley 1746-IG16 module, sourced directly from the manufacturer's data.
| Specification |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number |
1746-IG16 |
| Series |
SLC 500 |
| Module Type |
Digital DC Input Module |
| Voltage Range |
4.5-5.5 Volts DC Source |
| Inputs |
16 |
| Backplane Current (5 Volts DC) |
140 milliamps |
| Signal Delay |
0.25 or 0.5 milliseconds |
| Applications |
TTL or BCD inputs |
| I/O Connection |
1746-HT and 1746-HCA |
| Octal Kit |
1746-RL42 |
| Step Response |
100 milliseconds in, 2.5 milliseconds out |
| Removable Terminal Block |
1746-RT25B |
| Watts Per Point |
0.02 |
| Minimum Watts |
0.7 |
| Total Watts |
1 |
The 1746-IG16 operates with a 5V DC TTL signal input and supports a ripple voltage of 50 mV peak-to-peak. It features a backplane current rating of 0.14A at 5V DC and a maximum input signal delay of 0.25 ms for ON state and 0.5 ms for OFF state. The OFF-state voltage range is between 2 and 5.5 V DC, with an OFF-state current of 4.1 mA and an overall point input current of 3.7 mA.
Industry Applications
The Allen-Bradley 1746-IG16 is ideal for applications requiring TTL or BCD input interfacing. Typical use cases include:
- Interfacing with electronic devices that output TTL-level signals, such as counters, encoders, and digital sensors.
- Integrating BCD-coded switches or keypads into SLC 500 control systems for manual data entry.
- Connecting logic-level outputs from other control modules or microcontrollers to the PLC.
Because the module provides 16 points per fused common, it simplifies wiring and reduces panel space. Its fast signal delay and reliable step response make it suitable for high-speed monitoring and control tasks.
Installation & Setup Guidance
Proper installation is critical to ensure reliable operation of the 1746-IG16. Follow these guidelines:
- Handle the module by its ends, avoiding contact with metallic surfaces to prevent electrostatic discharge damage.
- Limit signal wiring to 15 meters (50 feet) per point to minimize noise and signal degradation.
- Use low-power DC wiring for signal connections. Avoid running signal wiring and communication cabling in the same conduit or duct.
- Install the module into any available slot in the SLC 500 chassis except slot 0, which is reserved for the controller.
The module requires only one slot and can be mixed with other SLC 500 modules. For easier troubleshooting and cleaner wiring, group modules of the same type together.
Maintenance & Reliability
The 1746-IG16 is designed for long-term reliability. Its electro-optical isolation is tested to 1500V between control logic and input terminals, providing excellent noise immunity. The module meets NEMA ICS 2-230 noise immunity standards and can withstand 2.5G operational vibration at 57-200Hz with 0.015 inches of peak displacement, as well as operational shock of 30G.
With an ambient operating temperature range of 0-60°C (32-140°F) and a relative humidity range of 5-95% without condensation, the module is suitable for harsh industrial environments. Storage temperature can range from -40°C to 85°C (-40°F to 185°F).
The 1746-IG16 is CSA and UL certified, including UL-A196, C-UL, and CSA Class I, Division 2 Hazardous Environment ratings, ensuring compliance with safety standards.
Compatibility & Integration
The Allen-Bradley 1746-IG16 is fully compatible with the SLC 500 controller platform. It can be integrated with other SLC 500 modules in the same chassis, allowing for flexible system configuration. The module's I/O connections use 1746-HT and 1746-HCA connectors, and it supports a removable terminal block (1746-RT25B) for easy wiring and maintenance.
Selection Guide & Purchasing Advice
When selecting the 1746-IG16, verify that your system requires TTL-level input signals and that the voltage range matches your application. Ensure that the SLC 500 chassis has an available slot and that the backplane current capacity is sufficient (the module draws 140 mA at 5V DC).
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