Allen Bradley 1746-IH16 SLC 500 Digital DC Input Module
Allen Bradley 1746-IH16 SLC 500 Digital DC Input Module
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Brand:Allen Bradley PLC Item No.:1746-IH16 Product Origin:USA Product Dimensions:144.5 × 34.6 × 130.18 mm Product Weight:0.453 kg Payment:T/T, Western Union, Credit Card Goods_stock:15 Shipping Port:Xiamen, China Lead Time:1-3 Days Condition:Brand New And Original Warranty:1 Year Certificate:COO
Introduction – High-Voltage DC Input Performance for SLC 500
The Allen Bradley 1746-IH16 is a 16-point digital DC input module developed for the SLC 500 programmable logic controller platform. Designed for 125V DC sinking input applications, it provides an interface between industrial field devices and the PLC control system, allowing equipment status and operating signals to be incorporated into automated control processes.
One of its key characteristics is its wide operating voltage range of 90–146V DC. This allows the module to accommodate different signal conditions within its specified electrical limits. With 16 input points and a maximum signal delay of 9 ms for both ON and OFF transitions, the 1746-IH16 is suitable for conventional industrial monitoring, equipment interlocking, and discrete control applications.
The module also features a removable terminal block, which provides practical advantages during installation and routine maintenance. Its single-module design helps keep the SLC 500 I/O configuration organized while providing multiple input channels for field signal acquisition.
For industrial facilities maintaining established Allen Bradley control systems, the 1746-IH16 is a valuable replacement and maintenance component. Its compatibility with the SLC 500 platform makes it a practical choice for extending the service life of existing automation equipment.
When purchasing this module, it is important to verify the exact catalog number and electrical requirements. Proper input wiring, chassis configuration, and power budget planning are essential for dependable operation.
Technical Specifications – Electrical Data & Physical Characteristics
The following table outlines the principal electrical and mechanical characteristics of the Allen Bradley 1746-IH16.
Parameter
Specification
Brand
Allen Bradley
Model Number
1746-IH16
Product Series
SLC 500
Product Type
Digital DC Input Module
Number of Inputs
16
Input Signal Type
DC Sinking
Voltage Category
125V DC
Operating Voltage Range
90–146V DC
Points per Common
16
Backplane Current (5V DC)
0.085 A
Backplane Current (24V DC)
0 A
Maximum Signal Delay ON
9 ms
Maximum Signal Delay OFF
9 ms
Maximum Off-State Voltage
20V DC
Maximum Off-State Current
0.8 mA
Nominal Input Current
2.15 mA @ 125V DC
Nominal Input Current
2.25 mA @ 132V DC
Terminal Connection
Removable Terminal Block
Installation
1746 SLC 500 I/O Chassis
Dimensions
144.5 × 34.6 × 130.18 mm
Weight
0.453 kg / 1.00 lb
Physical Dimensions and Weight
Length: 144.5 mm
Width: 34.6 mm
Height: 130.18 mm
Net Weight: 0.453 kg (1.00 lb)
These physical specifications are useful for replacement planning, equipment identification, and inventory management.
Recommended Related Models – SLC 500 Digital Input & Output Modules
The following Allen Bradley modules are relevant to SLC 500 digital I/O configurations and may be considered for related maintenance or system expansion requirements.
Model
Product Description
1746-IB16
SLC 500 16-Point Digital DC Input Module
1746-IB32
SLC 500 32-Point Digital DC Input Module
1746-IC16
SLC 500 16-Point 48V DC Input Module
1746-ITB16
SLC 500 16-Point Fast Response DC Input Module
1746-IM16
SLC 500 16-Point AC Input Module
1746-IV16
SLC 500 16-Point Digital DC Input Module
1746-OB16
SLC 500 16-Point Digital DC Output Module
These models cover different input and output requirements. Selection should be based on field voltage, signal type, channel count, and the electrical characteristics of the existing control system.
Popular Related Models – Allen Bradley SLC 500 Automation Components
In addition to the 1746-IH16, the following SLC 500 components are commonly associated with PLC control, signal processing, and industrial I/O applications.
Model
Product Description
1747-L511
SLC 500 Fixed Hardware Style Processor
1747-L532
SLC 500 Modular Processor
1747-L541
SLC 500 Modular Processor
1747-L542
SLC 500 Modular Processor
1747-L551
SLC 500 Modular Processor
1746-A7
SLC 500 7-Slot I/O Chassis
1746-A10
SLC 500 10-Slot I/O Chassis
1746-P1
SLC 500 Power Supply Module
1746-P2
SLC 500 Power Supply Module
Looking for Allen Bradley SLC 500 replacement parts?
The 1746-IH16 is an important component for maintaining existing high-voltage DC input applications. Choosing the correct module helps preserve the original control architecture and simplifies equipment maintenance. We support industrial automation spare parts sourcing, including Allen Bradley PLC processors, digital I/O modules, chassis, and power supplies, helping customers find suitable components for their maintenance and replacement projects.
Applications
The Allen Bradley 1746-IH16 SLC 500 Digital DC Input Module is designed for industrial control systems that require dependable monitoring of high-voltage DC signals. Featuring 16 sinking input points, this module enables an SLC 500 programmable logic controller to receive status signals from field devices operating within a 125V DC input environment.
Its design makes it suitable for industrial installations where reliable signal acquisition and integration with existing PLC infrastructure are essential.
Typical applications include:
Industrial Machine Control: Monitoring operating conditions, limit switches, and other DC signal devices.
Manufacturing Automation: Collecting equipment status signals for production monitoring and sequence control.
Power Distribution Systems: Monitoring DC-operated auxiliary contacts and equipment status signals.
Process Automation: Receiving discrete signals from industrial field devices and control equipment.
Legacy PLC Maintenance: Replacing existing SLC 500 input modules while maintaining established control system configurations.
Industrial Equipment Monitoring: Supporting signal acquisition in machinery, production facilities, and automated equipment.
Advantages
16-Point Input Capacity
The 1746-IH16 provides 16 digital DC input channels in a single module, allowing multiple field signals to be monitored through one SLC 500 I/O position.
High-Voltage DC Signal Compatibility
Designed for 125V DC sinking input applications, the module supports an operating voltage range of 90–146V DC. This makes it suitable for installations requiring higher-voltage DC signal monitoring.
Consistent Signal Processing
With a maximum ON and OFF signal delay of 9 ms, the module provides predictable input response characteristics for conventional industrial monitoring and control applications.
Convenient Maintenance Design
The removable terminal block simplifies field wiring maintenance and replacement procedures. Technicians can manage field connections more conveniently during servicing.
SLC 500 System Integration
Designed for the Allen Bradley SLC 500 platform, the 1746-IH16 provides a practical solution for maintaining existing PLC installations without redesigning the entire I/O architecture.
Reliable Replacement Option
For facilities operating established SLC 500 systems, sourcing the correct 1746-IH16 module can help maintain existing control functions and reduce unnecessary equipment replacement costs.
Q1. How many input channels does the Allen Bradley 1746-IH16 provide?
The 1746-IH16 provides 16 digital DC input channels. All 16 points share a common connection, making the module suitable for applications that require centralized monitoring of multiple DC field signals.
Q2. What is the rated input voltage of the 1746-IH16?
The module is designed for 125V DC sinking signal inputs. Its specified operating voltage range is 90–146V DC. The actual field voltage must remain within this range.
Q3. Does the 1746-IH16 support sinking input signals?
Yes. The 1746-IH16 is a sinking DC input module. Its input circuit is designed to receive compatible DC field signals, so the external device wiring and polarity must follow the recommended sinking input configuration.
Q4. What is the maximum signal response delay?
The maximum signal delay is 9 ms for both ON and OFF transitions. This response characteristic should be considered when configuring PLC logic for applications involving timing-sensitive operations.
Q5. What is the nominal input current of the 1746-IH16?
The nominal input current is 2.15 mA at 125V DC and 2.25 mA at 132V DC. These values are useful when evaluating field device compatibility and input circuit loading.
Q6. What is the backplane current consumption?
The module consumes 85 mA from the 5V DC backplane supply and 0 mA from the 24V DC backplane supply. These values should be included when calculating the total power requirements of an SLC 500 chassis.
Q7. What is the maximum off-state voltage?
The maximum specified off-state voltage is 20V DC. The maximum off-state current is 0.8 mA. These characteristics should be considered when selecting field devices to avoid unwanted input activation.
Q8. Can all 16 input points remain ON simultaneously?
The maximum number of simultaneously active points depends on operating voltage and ambient temperature. The specified limits include 6 points at 146V DC and 30°C, 12 points at 146V DC and 50°C, 14 points at 132V DC and 55°C, and 16 points at 125V DC and 60°C.
Q9. What should be checked if an input channel does not respond?
Start by checking the field supply voltage, wiring polarity, terminal connections, and input device condition. Also inspect the module's status indicators and verify that the input signal meets the specified electrical requirements.
Q10. Can the 1746-IH16 be installed in an existing SLC 500 chassis?
Yes. The 1746-IH16 is designed for installation in a compatible 1746 SLC 500 I/O chassis. Before installation, verify the available slot, chassis configuration, power budget, and correct module identification in the PLC project.
