The Allen-Bradley 1746-IH16 is a 16-point DC sinking input module designed for the SLC 500 programmable logic controller (PLC) platform. This module provides high-voltage DC input capabilities, specifically engineered for 125V DC applications. It is used to interface field devices such as sensors, switches, and pushbuttons with the SLC 500 backplane, facilitating reliable signal processing in industrial control systems.
Features
16-point input density for space-efficient I/O configuration.
Current sinking input design compatible with 125V DC field signals.
Integrated status indicators for visual confirmation of input signal state.
Designed for seamless integration into standard SLC 500 chassis.
Low backplane power consumption to support high-density system configurations.
Technical Specifications
Product Model
1746-IH16
Input Points
16
Operating Voltage Range
90-146V DC
Input Type
Current Sinking
Backplane Current (5V DC)
85 mA
Signal Delay
9 ms
Off-State Current
0.8 mA
Installation Guidelines
Ensure the SLC 500 chassis power is disconnected before installing or removing the module to prevent electrical damage.
Verify the module is fully seated in the chassis slot and the locking tabs are engaged.
Use shielded cabling for input signals to minimize electromagnetic interference (EMI) in high-noise industrial environments.
Maintain proper wire routing to separate signal-level wiring from high-voltage power lines.
Ensure the module is handled using proper ESD (Electrostatic Discharge) precautions to protect internal circuitry.
FAQ
What is the primary function of the 1746-IH16?
The 1746-IH16 is a digital input module that converts 125V DC field signals into logic levels compatible with the SLC 500 processor, allowing the PLC to monitor the status of external devices.
Is this module compatible with all SLC 500 chassis?
Yes, the 1746-IH16 is designed to fit into any standard SLC 500 I/O chassis slot.
What does current sinking mean for this module?
In a sinking input configuration, the module provides the return path to common for the input circuit. The field device must be wired to source the current to the module input terminal.
