Product Overview

The Allen Bradley 1790-7CMCBL CompactBlock LDX I/O Expansion Cable is a dedicated ribbon-cable accessory for the Bulletin 1790 CompactBlock LDX distributed I/O product family. It provides the interconnection required between compatible I/O base blocks and expansion blocks, helping maintain communication within a modular I/O assembly.

With a cable length of 7 cm, this model is intended for closely positioned modules where a compact connection is preferred. The standard cable is included with compatible expansion modules and is also available as a replacement accessory, supplied in lots of five according to the catalog specification.

The 1790-7CMCBL is particularly useful for industrial control panel maintenance, I/O system expansion, and replacement of damaged interconnection cables. It should not be mistaken for a DeviceNet network cable, as its function is specifically related to the connection between CompactBlock LDX modules.

For installations requiring greater spacing between expansion blocks, the optional 1790-15CMCBL provides a longer 15 cm connection. Selecting the appropriate cable length helps maintain the correct mechanical arrangement and reliable module interconnection.

Technical Specifications

Parameter	Specification
Brand	Allen Bradley
Model	1790-7CMCBL
Product Series	CompactBlock LDX
Product Type	I/O Expansion Cable
Cable Type	Ribbon Cable
Cable Length	7 cm / 2.76 in
Main Function	Interconnection of Compatible I/O Blocks
Application	CompactBlock LDX I/O Expansion
Compatible Equipment	CompactBlock LDX Base and Expansion Blocks
Package Quantity	5 Cables per Catalog Lot
Standard Accessory	Included with Compatible Expansion Modules
Shipping Weight	3 kg / 6.61 lb

Recommended Related Models

The following Allen Bradley products are relevant to CompactBlock LDX expansion and connection applications:

1790-15CMCBL – CompactBlock LDX 15 cm Longer Ribbon Cable.
1790-0B16X – CompactBlock LDX 16-Point Sourcing Output Expansion Block.
1790-0V16X – CompactBlock LDX 16-Point Sinking Output Expansion Block.
1790-0W8X – CompactBlock LDX 8-Point Relay Output Expansion Block.
1790-16BV0X – CompactBlock LDX 16-Point Universal Input Expansion Block.

Popular Related Models

1790-15CMCBL – Allen Bradley CompactBlock LDX 15 cm I/O Expansion Cable.
1790-0B16X – Allen Bradley CompactBlock LDX Sourcing Output Expansion Block.
1790-0V16X – Allen Bradley CompactBlock LDX Sinking Output Expansion Block.
1790-0W8X – Allen Bradley CompactBlock LDX Relay Output Expansion Block.
1790-8BV8BX – Allen Bradley CompactBlock LDX Mixed Digital I/O Expansion Block.

For replacement and procurement, confirm the cable length, package quantity, and compatibility with the installed CompactBlock LDX modules.

Applications

The Allen Bradley 1790-7CMCBL CompactBlock LDX I/O Expansion Cable is a replacement ribbon cable designed to connect compatible CompactBlock LDX I/O base blocks and expansion blocks. With a 7 cm cable length, it provides a compact interconnection solution for closely positioned modules in industrial automation installations.

Typical applications include:

I/O Module Expansion: Connects compatible CompactBlock LDX base blocks and expansion blocks.
Control Panel Wiring: Supports compact module arrangements inside industrial control cabinets.
Machine Automation: Maintains interconnections between digital I/O expansion modules.
Industrial Equipment Maintenance: Replaces damaged or worn expansion ribbon cables.
Distributed I/O Systems: Supports modular I/O configurations used in DeviceNet-based automation systems.
Legacy System Support: Helps maintain existing Allen Bradley CompactBlock LDX installations.

Key Features and Advantages

1. Compact 7 cm Cable Length

The 7 cm ribbon cable is suitable for closely positioned CompactBlock LDX modules, helping maintain a space-efficient installation layout.

2. Dedicated Expansion Connection

Designed for the CompactBlock LDX product family, it provides the interconnection between compatible I/O base blocks and expansion blocks.

3. Convenient Replacement Accessory

The cable is supplied as a replacement accessory and is also included with compatible expansion modules, simplifying maintenance and installation planning.

4. Flexible Module Configuration

Its compact length supports closely arranged expansion blocks while helping keep the I/O assembly organized.

5. Simplified System Maintenance

Replacing a damaged expansion cable helps restore the connection between compatible modules without requiring replacement of the complete I/O assembly.

6. Support for Industrial Automation Systems

The cable is intended for CompactBlock LDX installations used in industrial control panels, machine automation, and distributed I/O applications.

Technical FAQs

Q1: What is the Allen Bradley 1790-7CMCBL used for?

It is a replacement ribbon cable used to connect compatible CompactBlock LDX I/O base blocks and expansion blocks.

Q2: What is the cable length?

The cable is 7 cm long, equivalent to approximately 2.76 inches.

Q3: Is the 1790-7CMCBL included with expansion modules?

Yes. The standard 7 cm ribbon cable is included with compatible CompactBlock LDX expansion modules. Additional replacement cables can be purchased separately.

Q4: How many cables are included in the standard catalog package?

The catalog listing specifies the replacement ribbon cable in lots of five. Confirm the package quantity when placing an order.

Q5: Can this cable be used with all CompactBlock LDX expansion modules?

It is designed for compatible CompactBlock LDX I/O assemblies. Check the specific base-block and expansion-block connection requirements before installation.

Q6: What is the difference between the 1790-7CMCBL and 1790-15CMCBL?

The main difference is length. The 1790-7CMCBL is 7 cm long, while the 1790-15CMCBL is 15 cm long and provides additional spacing flexibility for supported mounting arrangements.

Q7: Is this a DeviceNet network cable?

No. It is an internal I/O expansion ribbon cable. It should not be confused with the external DeviceNet communication cable.

Q8: Can the cable be used for vertical mounting?

The standard 7 cm cable is intended for normal expansion interconnections. For vertical back-to-back mounting requiring additional spacing, the optional 15 cm cable is specified.

Q9: Does the cable provide power to external field devices?

Its primary purpose is to interconnect compatible I/O blocks. It is not a general-purpose field power cable.

Q10: What should be checked before replacing the cable?

Verify the catalog number, module compatibility, cable length, connector condition, and correct orientation. Follow the equipment manufacturer's safety and installation procedures.

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