Allen Bradley 1785-L20B

Feimu Technology, as a professional supplier, has introduced the Allen Bradley 1785-L20B basic processor to overseas industrial partners. It is the "powerful engine" of the PLC-5 series, equipped with 16K memory, specially designed for old equipment that does not require a large-capacity controller, balancing operational efficiency and cost control. This product is an original Allen Bradley processor and is available in stock for immediate delivery. It can be quickly shipped to meet equipment replacement or backup needs, with outstanding cost performance.

Product Parameters

How about the adaptability?

The most outstanding advantage of the Allen Bradley 1785-L20B is its adaptability. As a basic model, it is compact in size and does not occupy too much space, making it suitable for use in small control cabinets or standalone devices. It adopts the familiar RSLogix 5 programming environment for engineers, and for those who have used AB products before, it has zero learning curve and no need to learn new software, significantly improving the debugging efficiency.

At the same time, its compatibility is excellent. When paired with the old 1771 I/O module, it operates smoothly without the need to replace all the underlying modules for replacing the CPU. This further reduces the cost of equipment upgrades and maintenance. All the products we supply are brand new and strictly controlled in quality to ensure stable operation upon installation, compatible with Factory industrial control cabinets, and no additional modifications are required.

Core Technology

Memory Capacity:

Usually equipped with 16K bytes of user memory, which is sufficient to support medium complexity control logic and data processing.

I/O Processing Capacity:

Supports up to 1024 I/O points, capable of controlling local racks and also controlling distributed racks through remote I/O links.

Scanning Speed:

The logical scanning speed is approximately 2ms/K. For most general automation applications, the response speed is more than sufficient. Standard configuration:

It is equipped with an RS-232/422/485 serial port for connecting to programming terminals or operator interfaces.

Expansion:

By installing the communication module on the right side of the processor, support for DH+ or Remote I/O communication can be expanded, allowing for connection to a wider range of factory networks.

Main application scenarios:

Medium-sized production line control:

Used to manage medium-sized manufacturing processes such as food and beverage packaging lines and assembly lines.

Process control module:

As the control core of a specific process segment (such as filtration, batching) in a chemical plant or water treatment plant.

Equipment integrated control:

Often integrated into control cabinets of compressors, printing machines, textile machinery, etc., serving as the main controller of the equipment.

Replacement Procedure – 1785-L20B to 1785-L20B

Replacing a failed 1785-L20B with a new 1785-L20B requires careful preparation. Follow these steps to avoid program loss and minimize downtime.

Before replacement:

• Backup the program: Upload the program from the failed processor if possible. If not, locate the latest program file on the plant server.
• Record I/O configuration: Write down all chassis slot assignments and module types.
• Note the DH+ node address: The node address is set on the processor. Use the same address on the new processor.

Replacement steps:

1. Power down the chassis.
2. Remove the failed processor from the slot.
3. Insert the replacement processor into the same slot.
4. Set the DH+ node address to match the old processor.
5. Power up the chassis.
6. Download the program from RSLogix 5 to the new processor.
7. Place the processor in RUN mode.
8. Verify all I/O modules are communicating.

Common mistake: Forgetting to set the DH+ node address on the new processor. If the node address is different, other devices on the DH+ network will not communicate with it.