The Allen-Bradley 1746SC-INI4VI, also cataloged as the 1746SC-INI4VI Isolated Current/Voltage Input Module, operates as a dedicated hardware component for analog signal acquisition within SLC 500 control platforms. The module converts isolated voltage and current field inputs into 16-bit digital data values for PLC processing.

Module Identification

The 1746SC-INI4VI is a four-channel analog input module designed for SLC 500 systems. It supports isolated current and voltage measurement ranges including 0-10 VDC, +/-10 VDC, 0-5 VDC, 1-5 VDC, 0-20 mA, and 4-20 mA signals.

The module provides 16-bit input resolution and communicates analog measurement data through the SLC 500 backplane interface. The isolated input design separates field signal circuits from internal controller electronics.

Hardware Specifications

Analog Signal Isolation and Data Conversion

The 1746SC-INI4VI provides isolated analog signal measurement for SLC 500 controller applications. Each input channel accepts voltage or current signals from external field devices and converts the measured values into digital data for PLC application logic.

The isolated input architecture reduces direct electrical coupling between field wiring and the SLC processor system. Proper grounding and signal cable routing should be maintained according to industrial analog installation practices.

Industrial Control Platform Characteristics

Allen-Bradley SLC 500 modules use chassis backplane communication for processor and I/O data exchange. The 1746SC-INI4VI extends the platform I/O density by adding four configurable analog input channels for voltage and current measurement.

The module supports firmware compatibility within the SLC 500 hardware environment. Application configuration should match the selected input range and scaling requirements defined in the control program.

Ordering Information

• 1 x Allen-Bradley 1746SC-INI4VI Isolated Current/Voltage Input Module
• 1 x Module terminal interface assembly
• 1 x Factory-installed electronic hardware assembly
• SLC 500 chassis and processor hardware supplied separately

Field Installation Guidelines

Module Mounting

• Install the module into the assigned SLC 500 chassis slot.
• Remove system power before module insertion or removal.
• Confirm module seating and chassis locking mechanism before operation.

Analog Signal Wiring

• Separate analog input wiring from high-voltage and high-current cables.
• Use appropriate shielded cable practices for low-level analog signals.
• Connect signal references according to the system grounding design.

Configuration Requirements

• Select input range settings according to connected field transmitter output.
• Verify PLC scaling parameters match the configured analog range.
• Confirm input channel addressing before commissioning.

Frequently Asked Questions

• How many analog input channels does the 1746SC-INI4VI provide?

  The module provides 4 isolated analog input channels for voltage and current signal measurement within an SLC 500 chassis.

• Which voltage input ranges are supported?

  The module supports 0-10 VDC, +/-10 VDC, 0-5 VDC, and 1-5 VDC analog voltage input ranges.

• Which current input ranges are supported?

  The module supports 0-20 mA and 4-20 mA current input signals from external analog devices.

• What is the input resolution of this module?

  The 1746SC-INI4VI provides 16-bit analog-to-digital conversion resolution for measured input values.

• What power supply does the module require?

  The module draws 570 mA from the SLC 500 chassis 5 VDC backplane supply.

• Does this module provide isolated analog inputs?

  Yes. The module is designed with isolated current and voltage input channels for field signal acquisition.

• Can the input range be configured for different transmitters?

  Yes. The module supports multiple voltage and current ranges that must match the connected field device output.

• Is the 1746SC-INI4VI a standalone controller module?

  No. It is an analog input module installed in an SLC 500 chassis and requires a compatible processor system.