Overview
The Allen-Bradley 1746-IV16 is a discrete DC input module for the SLC 500 family of programmable controllers. This module has sixteen channels that accepts a nominal input voltage of 24VDC with operating voltage range of 10-30VDC. The Allen-Bradley 1746-IV16 is a SLC 500 sourcing discrete input module. Unlike sinking input modules (like the 1746-IB16), the 1746-IV16 supplies source current to the input devices, making it ideal for field devices that require external current sourcing. This current sourcing DC input module works with general purpose DC inputs applications.
Key Features
- 16 Sourcing Input Channels: This module features Sixteen (16) sourcing input channels, ideally used for interfacing electrical signaling devices such as switches, auxiliary contacts, sensors and other devices that provide binary or ON/OFF signal states.
- Removable Terminal Blocks: The 1746-IV16 module comes with removable terminal blocks, eliminating the need to disconnect any of the wires and making module replacement easy.
- Signal Conditioning: It also includes filter circuitry and optical coupling for signal noise reduction.
- LED Status Indicators: Troubleshooting becomes easier with LED indicators that show input status ratings.
- Fast Signal Response: The 1746-IV16 has a signal delay of 0.5 ms during off-state and 0.3 ms during on-state.
Technical Specifications
- Input Voltage Range: 10–30VDC (nominal 24VDC)
- Number of Inputs: 16 channels, 16 points per common
- Wiring Configuration: Sourcing (module provides input current)
- Input Current (nominal): 8 mA @ 24VDC
- Off-State Current (max): 1 mA @ 5VDC
- Maximum Off-State Voltage: 5VDC
- Power Dissipation (max): 3.6 W
- Backplane Current Load: 85 mA @ 5V
- Signal Delay: 0.3 ms (on), 0.5 ms (off)
- Operating Temperature: 0–60°C (32–140°F)
- Relative Humidity: 5–95% noncondensing
- Installation: 1746 SLC 500 chassis (any available slot)
Typical Applications
It finds applications in general-purpose DC inputs in an SLC 500 system. Common use cases include:
- Discrete sensor and switch monitoring (limit switches, proximity sensors, level switches)
- Auxiliary contact monitoring for motor starters and contactor feedback
- Binary alarm and fault signal detection
- General-purpose industrial control and automation systems
- Material handling and conveyor systems
- Equipment status and interlocking logic
Compatibility & Replacements
Compatible With
- SLC 500 modular chassis (all sizes: 1746-A2, 1746-A4, 1746-A6, 1746-A10, 1746-A13)
- SLC 500 fixed controllers with optional I/O rack
- All fixed and modular SLC 500 processors (1747-L series)
- Allen-Bradley PLC-5 networks via rack expansion
- Ladder Logic programming via RSLogix 500
- EtherNet/IP networks (via communication modules in same rack)
Replaces / Drop-In Replacement For
Verify compatibility with your system integrator before ordering. The 1746-IV16 directly replaces other 1746-IV16 units and is electrically and mechanically equivalent to earlier revisions (1746-IV16 /A, /B, /C, /D, etc.).
Works With
- RSLogix 500: Program input data directly into data files; accesses input status via bit addressing
- Allen-Bradley CompactLogix/ControlLogix: Verify rack compatibility; many modern systems migrate away from SLC 500
- Communication Modules: Works alongside 1746-KE modules (Ethernet), 1747-KE modules (industrial Ethernet) in the same chassis
- Remote I/O: Can function as local I/O in primary rack or remote I/O in expansion racks via scanner modules
