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Allen Bradley 1785-L60L

Allen Bradley 1785-L60L

Feimu Technology, as a professional supplier, offers you this Allen Bradley 1785-L60L. It is a classic PLC-5/60 processor that supports 64K memory. Through rigorous procurement channels and a complete set of functional tests, we ensure that every module delivered to you is in good condition and stable. If you have any questions, please feel free to come and inquire.

Feimu Technology offers the Allen Bradley 1785-L60L programmable controller to overseas customers. This processor belongs to the PLC-5/60 series and provides 64K words of user memory with hot standby capability for legacy system applications. As a high-end processor with 64K memory, although this module belongs to the previous generation technology, it still plays an indispensable central role in many legacy systems. For those customers who are committed to maintaining the stable operation of existing production lines and seeking cost-effective alternatives, this spare part is undoubtedly a highly reliable choice, capable of effectively solving the maintenance problems of old systems.



Technical Specifications

The Allen Bradley 1785-L60L is a high-end processor for the PLC-5/60 system. It provides 64K words of user memory and supports hot standby redundancy for critical applications.

Parameter Specification
Product Model Allen Bradley 1785-L60L
Product Series PLC-5/60
User Memory 64K words (approximately 128K bytes)
Maximum I/O Points 4096 points total (2048 inputs + 2048 outputs)
Maximum I/O Racks Up to 24 racks
Communication Ports 1 x DH+, 1 x RS-232
Scan Time 0.5ms per 1K instructions
Hot Standby Support Yes (standard feature)
Programming Software RSLogix 5
Programming Cable 1747-PIC or USB converter
Module Size Two-slot module
Backplane Current Draw 2.5A at 5V DC
Power Dissipation 6W maximum
Operating Temperature 0°C to 60°C
Storage Temperature -40°C to 85°C
Certifications UL, cUL, CE

PLC-5/60 Processor Comparison – L Series Models

The PLC-5/60 family includes several variants. The “L” suffix indicates a specific configuration. This comparison helps you understand the differences between models.

Model Memory I/O Capacity Hot Standby Physical Size
1785-L60B 64K words 4096 I/O Supported 2-slot
1785-L60L 64K words 4096 I/O Supported 2-slot
1785-L80B 100K words 4096 I/O Supported 2-slot
1785-L20B 16K words 1024 I/O Not supported 1-slot

Key differences between L60B and L60L:

  • 1785-L60B: Standard 64K processor for PLC-5/60 systems.
  • 1785-L60L: Same memory and I/O capacity as L60B. The “L” typically indicates a version with enhanced communication or specific factory configuration.
  • Both models: Support hot standby redundancy.
  • Compatibility: L60L can replace L60B in most systems without program changes.

Typical Applications – Where the 1785-L60L Is Still Used

Despite being a legacy product, the 1785-L60L is still installed in many critical systems. Here are real application examples.

Industry Application Why 1785-L60L Is Used
Oil & Gas Pipeline monitoring and control Proven reliability. System already validated. Replacement cheaper than redesign.
Water Treatment Pump station automation Runs 24/7. Hot standby ensures no downtime.
Automotive Assembly line coordination Existing network uses PLC-5. Replacing the processor keeps the line running.
Warehousing Automated storage and retrieval systems Complex logic already programmed. No budget for full system upgrade.

Status LEDs and Diagnostics

The 1785-L60L has multiple LEDs on the front panel. These provide immediate status information without a programming terminal.

LED Status Meaning Action
PWR Green Processor powered and operating normally. No action needed.
PWR Off No power to processor. Check chassis power. Check module insertion.
RUN Green Processor is in RUN mode. No action needed.
RUN Off Processor is in PROGRAM mode. Switch to RUN mode from RSLogix 5.
RUN Flashing Processor in PROGRAM mode with forces enabled. Check forces. Enable or disable as needed.
FAULT Red Processor fault. Hardware or software error. Check fault code in RSLogix 5. Clear fault or cycle power.
BAT Red Battery voltage low. Replace battery within 1 week.
DH+ Green DH+ communication active. No action needed.
DH+ Off No DH+ communication. Check cable. Check terminator. Check node address.


Product Authenticity Verification

Allen Bradley 1785-L60L processors are high-value legacy components. They are frequently counterfeited or sold with damaged internal components. Use these checks to verify authenticity.

  • Front panel color: Genuine processors use a specific beige-gray color consistent with the PLC-5 family. Counterfeits often have a different shade or glossy finish.
  • Label quality: Genuine labels have permanent printing with the model number 1785-L60L clearly visible. Counterfeit labels often have blurry text or peel at edges.
  • Module weight: Genuine 1785-L60L weighs approximately 1.2 kg. The heavy metal casing and thick PCB give it substantial weight. Counterfeits often feel lighter.
  • Backplane connector: All pins on the backplane connector must be gold-plated and straight. Counterfeits often use tin pins or have bent pins.
  • Battery compartment: Genuine processors have a battery compartment on the front panel. Counterfeits often have a missing or poorly made battery compartment.

If the processor shows a red FAULT LED after loading the program, suspect a counterfeit. Contact Feimu Technology with photos for verification.



What Feimu Does

Feimu Technology does not ship untested processors. Each 1785-L60L goes through the following verification process before leaving our warehouse.

  • Visual inspection: Panel color checked. Labels verified. Battery compartment inspected. Backplane connector checked for bent pins.
  • Power-on test: Processor installed in PLC-5 test chassis. Power applied. PWR LED confirmed on.
  • Memory test: Standard test program downloaded to the processor. Program verified to run without errors.
  • DH+ test: Processor connected to DH+ network. Communication confirmed with a second device.
  • Battery test: Battery voltage measured. Verified above 2.8V.
  • 24-hour burn-in test: Processor runs continuously with a test program. Temperature monitored.
  • Packaging: Processor placed in anti-static bag. Sealed in foam-lined carton. Labeled with module number and test date.

Test reports are available upon request. Email sales@feimutech.com for a copy of your processor's test report.


Core functional features

Memory capacity:

Usually equipped with 100K bytes of user memory, which is sufficient to store thousands of ladder diagram logic and data tables.

I/O processing capability:

Supports up to 4096 I/O points, allowing for the connection of a large number of sensors and actuators.

Scanning speed:

Features extremely fast logic scanning speed, ensuring high responsiveness for real-time control.

Communication capability:

Built-in powerful communication functions, supporting DH+ and Remote I/O communication, enabling easy connection to programming terminals, human-machine interfaces (HMI), and other controllers to build a distributed control system.


What are the characteristics of the structural design?


The components on this Allen Bradley 1785-L60L are densely arranged, but they are not disordered at all. The capacitors and resistors around the chip are actually designed to resist interference and stabilize voltage. To prevent damage from dust and moisture in the workshop, a thick layer of three-proof paint is applied to the surface of the board. The heat dissipation part is also very particular, using a large area of metal heat conduction plate, directly attached to the heat, not the kind of easy to break the small fan, relying on natural heat dissipation can be stable, which reduces a point of failure, with more worry.


What are the advantages compared to similar products?


The most distinctive feature of this Allen Bradley 1785-L60L is its durability and excellent compatibility. Many old equipment in factories can only be perfectly adapted with this type of PLC with the old interface. Switching to a new one not only requires rewriting the program but also might necessitate replacing the underlying I/O module, which is too costly. This product is like that universal key that can be used directly when inserted, without any hassle. Additionally, its programming environment is the familiar RSLogix 5. Many old engineers can write programs with their eyes closed and it is particularly convenient for maintenance, as there is no need to relearn those complex new software.


Usage and Application Scenarios

1. Scenarios where monitoring of thousands of parameters is required include oil and gas pipeline transportation, water treatment plants, and chemical reaction process control.

2. In automobile manufacturing and large assembly lines, as the main controller, it coordinates the synchronized operation of multiple workstations, robots, and conveyor belts.

3. Control of large automated storage warehouses, high-rise stacker cranes, and complex conveying and sorting systems.

4. Energy monitoring and management for power plant distribution systems or large facilities.



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