1746-IV16 16-Point DC Input Module (SLC 500)

Overview

The Allen-Bradley 1746-IV16 DC input module expands your SLC 500 with sixteen DC input channels in a single slot. Designed for harsh plants, it features robust input filtering and per-point LED indication for fast diagnostics.

Use it to read limit switches, proximity sensors, pushbuttons, and interlocks on conveyors, skids, and packaging machines, and it screws into standard 1746 terminal blocks with compatibility for common SLC power supplies and racks.

Engineering & Design

The high density design provides 16 inputs in one module, saving rack space for the I/O allocation of the system. The industrial input filtering provides noise tolerance for reliable state detection in electrically noisy plants.

Per-channel LEDs simplify fault finding, and the service-oriented design allows the module to be replaced or expanded without rewiring the whole panel, supporting the long-term maintenance of legacy SLC 500 systems.

Key Features

• 16 DC input channels in one module
• High density, saves rack space
• Robust industrial input filtering
• Per-point LED indication
• Noise-tolerant state detection
• Standard 1746 terminal blocks
• Compatible with SLC power supplies and racks
• Fast fault finding
• Replace or expand without rewiring

Applications

• Limit switch monitoring
• Proximity sensor inputs
• Pushbutton and interlock reading
• Conveyor and skid control
• Packaging machine I/O

Specifications

For SLC 500 input expansion, the 1746-IV16 DC input module is the standard choice, and Seven Star LLC supplies the 1746-IV16 DC input module with verification for your system.

The Allen-Bradley 1746-IV16 is the 16-channel DC input module of the SLC 500 system and accepts the 24 V DC field signals of the proximity switches and the relay contacts. The module is inserted into the 1746 chassis and the wiring is made on the removable terminal block. Each channel is addressed by the slot and the terminal number, and the LED indicators show the state of the individual inputs. The module is compatible with the SLC 5/02 and the higher processors of the family.

The input response time of the module is selected by the slot configuration in the ladder program, and the filter time is set for the application of the plant. The input circuits are isolated in the groups to reduce the effect of the ground loops. The spare 1746-IV16 module replaces the failed unit without changing the wiring of the cabinet.

The 1746-IV16 module is configured with the input filtering in the program file of the processor, and the group isolation allows the mixed use of the two commons. The module status is displayed with the individual LEDs for the diagnostics of the field wiring. The spare module is installed in the same slot and the ladder program requires no modification. The terminal numbering is printed on the module cover for the wiring reference.

The 1746-IV16 module is used for the limit switch and the proximity sensor inputs of the SLC 500 station. The input commons are wired to the 24 V DC return of the cabinet and the field devices are connected to the terminal of the module. The spare module is stored with the other 1746 series spares of the plant.

Why Seven Star LLC

Seven Star LLC supplies the Allen-Bradley 1746-IV16 DC input module for SLC 500 systems across the Gulf, with genuine hardware and testing options on request. Our team assists with slot mapping and module selection for legacy systems.

We support maintenance teams keeping SLC 500 machines productive with reliable B2B supply of PLC spares throughout the GCC.

Installation & Operation

The module slides into the SLC 500 chassis and connects to the terminal block with the field wiring of the input devices. The per-point LEDs show the input state immediately, supporting fast fault finding during commissioning.

The industrial input filtering rejects the electrical noise of plant environments, and the high density design leaves rack space for other modules.

Request a Quote for 1746-IV16 16-Point DC Input Module (SLC 500)

For the 1746-IV16 DC input module or any related control and instrumentation requirement, contact the Seven Star LLC team. Submit a formal inquiry through our RFQ page with your module, I/O and system configuration, and our specialists will respond with a detailed commercial proposal and the 1746-IV16 product documentation.

Identifying the Right Input Module

The SLC 500 range includes several 16-point DC input modules that differ in input type and voltage, and they are not interchangeable in the field wiring. Before ordering, check the catalog number and series letter on the module label, confirm whether the field devices are wired for sinking or sourcing inputs, and compare the input voltage with the cabinet supply. Matching the catalog number exactly is the safest route when replacing a failed card, because the I/O configuration in the processor expects the same module type in that slot.

Replacement Procedure

• Save a current copy of the processor program and note the slot number of the module
• Follow site procedures for isolating power and placing the machine in a safe state
• Remove the terminal block with its wiring still attached, then withdraw the module from the chassis
• Insert the replacement, refit the terminal block and restore power
• Confirm that the processor shows no I/O fault, then check each input LED and data bit by operating the field devices

Troubleshooting Inputs

If an input LED lights but the program does not see the signal, check the I/O configuration and addressing in the processor. If the LED does not light, measure the voltage at the terminal with the field device operated, and check the common connection back to the supply. Inputs that flicker or change state unexpectedly usually point to noise, poor terminations or leakage current from two-wire proximity sensors, and the input filter settings may need review. The module itself should be replaced only after the field side has been ruled out.

SLC 500 Support in Oman and the GCC

SLC 500 controllers still run packaging lines, water treatment skids, conveyors and utility systems in many plants across the region. Keeping tested spares of the most common I/O modules on site reduces downtime while a longer-term migration is planned.

Supply from Seven Star LLC

Seven Star LLC supplies the 1746-IV16 DC input module and other SLC 500 spares. Send the catalog number, series and quantity, and our team will confirm condition options and availability.

Related Products

• Siemens S7-300
• Schneider Electric Modicon TM3TM Thermocouple Input Module
• 1746-A10 SLC 500 Ten-Slot Chassis
• Advantech ADAM-6017 8-Channel Analog Input Ethernet I/O Module
• HIMA HIQuad X Safety PLC System
• CT94273B/04 Programmable Processor Module