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The 1746-IH16 is a 16-point discrete input module designed for the Allen-Bradley SLC 500 controller platform. This high-density module operates at a nominal input voltage of 125V DC and resides in any available slot of an SLC 500 chassis, providing a reliable interface for high-voltage DC field devices such as sensors and limit switches.
125V DC High-Voltage Interface
16-Point High-Density Design
1500V Optical Isolation
This module features a wide operating voltage range from 90V DC to 146V DC and provides 1500V AC optical isolation between the input terminals and backplane logic. It is equipped with a removable terminal block for simplified wiring and includes 16 status LEDs on the front panel to indicate the ON/OFF state of each input point for rapid system diagnostics.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Allen-Bradley 1746-IH16 DIGITAL INPUT MODULE Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Power Generation
Monitors high-voltage DC auxiliary circuits and battery bank status in electrical substations. The 125V DC nominal input range allows direct interfacing with protective relays and circuit breaker position switches.
Rail Transportation
Tracks signal interlocking and wayside control systems using standard transit voltage levels. It provides 1500V AC optical isolation to protect the controller logic from transient surges common in electrified rail environments.
Oil and Gas
Interfaces with emergency shutdown (ESD) systems and high-voltage DC sensors on offshore platforms. The 16-point high-density design optimizes cabinet space while maintaining a wide operating voltage of 90V to 146V DC.
Mining Operations
Supervises heavy-duty DC motor starters and braking systems for underground hoists. The rugged discrete input circuitry ensures reliable signal detection from long-distance limit switches in harsh industrial conditions.
Chemical Processing
Coordinates status feedback from DC-powered solenoid valves and safety interlocks in refinery units. The module features 16 status LEDs on the front panel for rapid visual diagnostics of high-voltage field device states.
Marine Systems
Manages shipboard DC power distribution monitoring and propulsion control feedback. It utilizes a removable terminal block to simplify maintenance and wiring of 125V DC inputs within compact marine control consoles.
The 1746-IH16 must be installed into any available slot of an SLC 500 chassis, with the exception of slot 0 which is reserved for the processor. Before installation or removal of the module, all power to the SLC chassis and all 125V DC external field power sources must be disconnected to prevent equipment damage or personal injury.
The module is equipped with a removable terminal block to allow for easier wiring of high-voltage DC field devices; however, it is critical that the terminal block is fully seated and the door latches are secured to maintain proper backplane communication. Proper cable routing is required to ensure that high-voltage 125V DC input lines are physically separated from low-voltage communication and control wiring to minimize electromagnetic interference.
During operation, the 16 status LEDs on the front panel should be used to verify the logical state of the inputs, and regular inspections should ensure that terminal connections remain tight and that the ambient operating temperature does not exceed 60°C (140°F) to maintain the integrity of the 1500V AC optical isolation.
What is the operating voltage range for the 1746-IH16 input module?
The 1746-IH16 is designed for a nominal input voltage of 125V DC, with an operating voltage range spanning from 90V DC to 146V DC.
What is the maximum backplane current draw for the 1746-IH16 from the SLC 500 chassis?
The module has a maximum backplane current consumption of 85 mA at 5V DC and 0 mA at 24V DC from the power supply.
How many input points are provided on a single 1746-IH16 module?
The 1746-IH16 is a high-density discrete module that provides 16 input points, organized into a single group with one common return.
What are the nominal and maximum input currents for each point on the 1746-IH16?
Each input point has a nominal input current of 1.0 mA at 125V DC and a maximum current of 1.2 mA at 146V DC.
What is the signal delay time for the 1746-IH16 when switching from "on" to "off"?
The module features a maximum signal delay of 4.0 ms for the "on" state and 4.0 ms for the "off" state in DC applications.
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