The Allen-Bradley 1746-IM8 1746IM8, also cataloged as the 1746-IM8/A 240V AC Input Module, operates as a dedicated hardware component for capturing eight discrete 200/240 VAC field input signals within SLC 500 automation control architectures.

Catalog Nomenclature & Model Suffix Breakdown

Hardware Technical Specifications

Backplane Bus & Network Communication Parameters

The hardware utilizes backplane bus communication velocity licences to maintain deterministic status polling across discrete AC channels. I/O density scaling capabilities allow operators to expand 240 VAC sensor arrays across available backplane slots without violating bus timing constraints or scan interval limits. Firmware flash compatibility ensures that low-level communication protocol stacks remain synchronized with controller processors during active industrial execution.

Bill of Materials & Order Package Contents

• 1 x Allen-Bradley 1746-IM8 AC Input Module (Part Number: 1746IM8)
• 1 x Removable Terminal Block (RTB) Connector Assembly
• 1 x Technical Compliance Documentation Leaflet

Physical Mounting & Wiring Installation Directives

• Ensure chassis backplane power is completely isolated before inserting or extracting the AC input module.
• Mount the unit into any available I/O slot within the SLC 500 chassis, confirming proper mechanical alignment with guide rails.
• Connect field high-voltage sensor wiring to the removable terminal block using appropriately rated copper conductors.
• Route AC input lines separately from low-voltage DC signals and communication cables to prevent electromagnetic coupling.

Frequently Asked Questions

• Q: What is the primary operational function of this module within the control system?
• A: It detects and converts eight distinct 200/240 VAC discrete field signals into logic-level states for the SLC 500 processor.
• Q: How many input channels are supported simultaneously by the hardware?
• A: The module provides eight independent discrete AC input channels on a single card.
• Q: What is the nominal input voltage rating for the circuit channels?
• A: The input circuitry is engineered specifically for 200/240 VAC operational environments.
• Q: What is the specified operating temperature range for the unit?
• A: The hardware functions reliably within an ambient operating temperature range of 0 deg C to +60 deg C.
• Q: Does this module support live insertion and removal (hot-swapping)?
• A: No, power to the rack chassis must be turned off prior to installing or removing the module.
• Q: Why must AC field wiring be physically separated from low-voltage cables?
• A: Separation suppresses high-voltage inductive switching noise from corrupting sensitive data signals or low-voltage loops.
• Q: How much power does the module draw from the rack?
• A: The unit consumes approximately 2.0 W of operational power during active monitoring states.
• Q: What routine maintenance checks are recommended?
• A: Periodically verify terminal screw torque values and confirm that cabinet cooling paths remain entirely clear.