Configured for high-density multi-channel analog signal acquisition within Allen-Bradley SLC 500 modular control architectures, the Allen-Bradley 1746-NI16I 1746NI16I SLC 16 Point Analog Input Module converts sixteen independent analog current inputs into 16-bit digital register data across controller backplane slots.

Nomenclature & Catalog Breakdown

Hardware Specifications Table

Backplane Bus & Network Communication Parameters

The hardware utilizes backplane bus communication velocity licences to maintain deterministic register updates across sixteen independent analog channels. I/O density scaling capabilities allow operators to integrate high-density sensor arrays across chassis 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 process monitoring.

Package Contents & Bill of Materials

• 1 x Allen-Bradley 1746-NI16I Analog Input Module (Part Number: 1746NI16I)
• 1 x 25-pin D-shell AIFM Connector Interface
• 1 x Technical Compliance Documentation Leaflet

Field Installation & Wiring Guidelines

• Ensure chassis backplane power is completely isolated before inserting or extracting the high-density analog module.
• Mount the unit into any available I/O slot within the SLC 500 chassis, ensuring proper alignment with guide rails.
• Connect field transmitter signal lines to the 25-pin D-shell connector, maintaining proper shielding for all current loops.
• Route analog input cables away from high-voltage power lines and variable frequency drives to suppress electromagnetic interference.

Frequently Asked Questions

• Q: What is the primary operational function of this module within the control system?
• A: It samples and digitizes up to sixteen independent analog current input signals, converting them into 16-bit data words for the processor.
• Q: How many input channels are supported simultaneously by the hardware?
• A: The module provides sixteen dedicated input channels on a single slot card.
• Q: What electrical signal ranges are accepted by the input circuitry?
• A: It accepts 0 to 20 mA, 4 to 20 mA, plus or minus 20 mA, and 0 to 1 mA current loops.
• Q: How much power does the module draw from the rack power supplies?
• A: It draws 125 mA from the 5 VDC backplane rail and 75 mA from the 24 VDC rail.
• Q: What is the specified operating temperature range for the hardware?
• A: The module operates reliably within an ambient temperature range of -25 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 completely turned off prior to installing or removing the unit.
• Q: Why is channel-to-channel isolation beneficial for this module?
• A: Isolation enhances noise immunity and ensures that an electrical fault on one channel does not disrupt neighboring signal loops.
• Q: What maintenance checks are recommended for this installation?
• A: Routinely inspect cable connections at the D-shell interface and verify that cabinet ventilation paths remain unobstructed.