Overview
The Allen-Bradley 1746-IV16 /C is a 16-channel digital DC input module engineered for SLC 500 fixed and modular controller platforms. This sourcing input module accepts 24VDC signals across a 10–30VDC operating range, making it suitable for general-purpose discrete sensor and switch interfacing in manufacturing, HVAC, material handling, and process control environments.
Key Features
- 16 Sourcing Input Channels: Supplies signal voltage internally; ideal for devices requiring external excitation
- Fast Response Time: On-state delay 0.3 ms, off-state delay 0.5 ms for time-critical applications
- Removable Terminal Blocks: Quick module replacement without rewiring sensor connections
- LED Status Indicators: Front-panel diagnostics for rapid troubleshooting
- Optical Isolation & Noise Filtering: Integrated protection against electrical noise and EMI
- Single-Slot Chassis Mounting: Maximizes available I/O expansion room
Technical Specifications
- Input Voltage (Nominal): 24VDC
- Operating Voltage Range: 10–30VDC
- Number of Inputs: 16
- Input Type: Current Sourcing DC
- Nominal Input Current: 8 mA @ 24VDC
- Off-State Current (Max): 1 mA @ 24VDC
- Signal On Delay (Max): 0.3 ms
- Signal Off Delay (Max): 0.5 ms
- Backplane Current Load @ 5V: 85 mA
- Maximum Current Dissipation: 3.6 W
- Operating Temperature: 0–60 °C (32–140 °F)
- Humidity (Non-Condensing): 5–95% RH
- Mounting Type: Chassis slot (single)
- Terminal Connection: Removable screw terminal blocks
- Series: SLC 500 (Rockwell Automation)
Typical Applications
The 1746-IV16 excels in environments requiring reliable discrete signal acquisition:
- Sensor input interfacing (proximity, limit switches, photoelectric)
- Auxiliary contact monitoring (motor starters, solenoids)
- Binary signal conditioning for safety-critical circuits
- Expansion I/O for modular SLC 500 rack systems
- Remote I/O rack deployment in distributed automation networks
Compatibility & Replacements
The 1746-IV16 /C integrates seamlessly with all SLC 500 processor generations via standard backplane connection. Input data is stored in the controller’s data image table for access via ladder logic or structured text programming. Compatible with SLC 5/01 through SLC 5/05 controllers. Direct mechanical/electrical replacement for earlier revisions (A, B series). For fast-response applications requiring sub-millisecond reaction, consider the 1746-ITV16 variant. The 1746-IV32 provides 32-point capacity in a single module if higher density is required.
