Allen Bradley 1790-0B16X CompactBlock LDX I/O Expansion Block
Allen Bradley 1790-0B16X CompactBlock LDX I/O Expansion Block
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Brand:Allen Bradley PLC Item No.:1790-0B16X Product Origin:USA Product Dimensions:104 x 42 x 52 mm Product Weight:0.1 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
The Allen Bradley 1790-0B16X CompactBlock LDX I/O Expansion Block is a digital output expansion module from the Bulletin 1790 CompactBlock LDX product family. It is designed to add 16 sourcing output points to compatible distributed I/O assemblies, helping industrial users expand machine-control capabilities without replacing the entire I/O system.
Operating with a nominal 24 V DC field supply, the module supports a maximum output current of 0.5 A per channel and 4.0 A per common. Its 37-pin D-shell interface provides a structured connection for field wiring, while photocoupler isolation helps separate the I/O circuitry from the internal logic.
The 1790-0B16X is particularly useful in legacy DeviceNet automation installations where additional digital output capacity is required. It must be installed as part of a compatible CompactBlock LDX assembly rather than used as an independent controller or standalone I/O block.
Rockwell Automation discontinued this model effective June 30, 2024. It remains relevant to equipment maintenance, spare-parts procurement, and existing system support projects where the original hardware configuration needs to be maintained.
Technical Specifications
Parameter
Specification
Brand
Allen Bradley
Model
1790-0B16X
Product Series
CompactBlock LDX
Product Type
Digital I/O Expansion Block
Communication System
DeviceNet
Number of Outputs
16
Output Type
24 V DC Sourcing
Output Configuration
Non-Isolated
Nominal Field Voltage
24 V DC
On-State Voltage Range
10–28.8 V DC
Maximum Output Current
0.5 A per channel
Maximum Current per Common
4.0 A
Output Signal Delay
0.5 ms OFF-to-ON / 1.0 ms ON-to-OFF
Status Indicators
16 Green LEDs
Isolation
Photocoupler
Isolation Voltage
1250 V AC RMS
Connector
37-Pin D-Shell
Installation
CompactBlock LDX Expansion Assembly
Dimensions
104 × 42 × 52 mm
Weight
0.1 kg / 0.22 lb
Lifecycle Status
Discontinued
Recommended Related Models
The following Allen Bradley CompactBlock LDX products are relevant when expanding or maintaining compatible distributed I/O systems:
These models have different I/O configurations. Check the required signal type, base-block compatibility, and connector arrangement before selecting an alternative.
Popular Related Models
1790-T0B16X – Allen Bradley CompactBlock LDX 16-Point Sourcing Output Expansion Block with Screw-Clamp Connection.
1790-T0V16X – Allen Bradley CompactBlock LDX 16-Point Sinking Output Expansion Block with Screw-Clamp Connection.
1790-T8BV8BX – Allen Bradley CompactBlock LDX Mixed Digital I/O Expansion Block.
1790-T8BV8VX – Allen Bradley CompactBlock LDX Mixed Digital I/O Expansion Block.
For procurement and replacement projects, confirm the full catalog number and connector type. Since the 1790-0B16X is discontinued, checking hardware condition, stock availability, and compatibility with the existing CompactBlock LDX base unit is especially important.
Applications
The Allen Bradley 1790-0B16X CompactBlock LDX I/O Expansion Block is a 24 V DC digital output expansion module designed to increase the output capacity of compatible CompactBlock LDX distributed I/O systems. Featuring 16 sourcing output points and a D-shell connector, it allows automation systems to control multiple DC field devices through an expanded I/O configuration.
Typical applications include:
Industrial Manufacturing: Controls indicator lamps, relays, and other compatible DC output devices.
Conveyor Systems: Provides additional digital output points for controlling field equipment.
Machine Automation: Expands the output capacity of compact control systems.
Packaging Equipment: Supports switching signals for automated packaging machinery.
Material Handling: Provides output connections for distributed equipment control.
Process Automation: Adds digital output capacity to compatible DeviceNet-based installations.
Key Features and Advantages
1. 16 Digital Output Points
The module provides 16 non-isolated sourcing output points, allowing multiple DC loads to be controlled through one expansion block.
2. 24 V DC Output Operation
Designed for 24 V DC industrial control applications, the module supports common automation devices such as compatible relays and indicator lights.
3. Sourcing Output Design
Its sourcing output configuration supplies positive voltage to connected loads when an output is activated. Correct wiring and load polarity are essential for reliable operation.
4. D-Shell Connection
The 37-pin D-shell connector provides an organized interface for field wiring and helps simplify connections within the CompactBlock LDX system.
5. Compact Installation Design
Its compact housing makes it suitable for control panels and installations where available mounting space is limited.
6. Optical Isolation
Photocoupler isolation between I/O and logic circuits helps separate field-side signals from internal logic circuitry.
7. Expandable I/O Architecture
The 1790-0B16X can be connected to a compatible CompactBlock LDX base block to increase the system's available digital output capacity.
Technical FAQs
Q1: How many output points does the 1790-0B16X provide?
It provides 16 non-isolated digital output points, all configured as sourcing outputs.
Q2: What is the rated operating voltage?
The nominal field voltage is 24 V DC. The specified on-state voltage range is 10–28.8 V DC.
Q3: What is the maximum output current per channel?
The maximum output current is 0.5 A per output. The maximum current per common is 4.0 A.
Q4: What type of output does this module use?
It uses 24 V DC sourcing outputs. The connected loads must be wired with the correct polarity and compatible electrical ratings.
Q5: Does the module support standalone operation?
No. It is an expansion block and must be connected to a compatible CompactBlock LDX base block.
Q6: What connector does the 1790-0B16X use?
It uses a 37-pin D-shell connector for its I/O connections.
Q7: Does the module provide output status indicators?
Yes. The module provides 16 green output status indicators for monitoring channel activity.
Q8: What is the maximum output signal delay?
The specified maximum delay is 0.5 ms from OFF to ON and 1.0 ms from ON to OFF.
Q9: What isolation does the module provide?
It uses photocoupler isolation between the I/O circuits and logic circuits, with a specified isolation voltage of 1250 V AC RMS.
Q10: What should be checked when replacing this module?
Verify the complete catalog number, output type, field voltage, connector arrangement, wiring configuration, and compatibility with the installed base block. Also check the DeviceNet system configuration before commissioning.
