Allen Bradley 1785 L20C15

The Allen Bradley 1785 L20C15 comes with a built-in communication interface and is compatible with the 1771 series I/O rack. Its logical operation and data processing capabilities meet the control requirements of small and medium-sized equipment, and it is suitable for scenarios such as packaging equipment, small assembly lines, and metallurgical auxiliary devices. As a professional supplier, Feimu Technology will complete all-inclusive tests including power-on communication and long-term aging for all incoming spare parts, eliminating the hidden aging problems of components. The modules can directly be compatible with the original project programs, and the on-site modification and alteration are small, reducing the equipment debugging cost.

Internal structure

The Allen Bradley 1785 L20C15, as a processor module of the PLC-5 series, is mainly composed of the following components internally:

Main Control Board (PCB)

Integrated processor, memory, and control circuits, responsible for program execution and data processing.

The processor unit (CPU)

Executing PLC control program, complete the logic operation, data processing and system control.

Storage unit (Memory)

It is used to store user programs, data tables, and system running data.

Communication Circuit (Communication Circuit)

It is responsible for data communication between the processor and external devices such as DH+ and Remote I/O.

The back Interface (Backplane Interface)

Connect with PLC-5 frame to supply power to module and realize internal data exchange.

Status indication circuit (Status Indicators)

Processor operation, failure and communication status are displayed by LED.

Structural relationship: CPU → Memory → Control circuit → Communication interface → backplane interface → PLC-5 system

The core advantage selling point

PLC-5 architecture compatibility: Suitable for existing PLC-5 system maintenance.

Stable control performance: meet the needs of continuous operation of industrial equipment.

I/O management capability: supports data collection and control of field devices.

System maintenance convenience: can be used for the replacement of spare parts after the original processor failure.

Life Cycle Support: Helps extend the usage period of traditional PLC-5 equipment.

Technical Specifications

Application fields

The Allen Bradley 1785 L20C15 is mainly used for:

Industrial automated production lines,

Mechanical equipment control,

Material conveying systems,

Process control equipment,

Maintenance of factory PLC-5 systems,

Repair of old automated equipment;

Typical scenario: It is used to replace the faulty processor in the original PLC-5 system, restoring the equipment operation while maintaining the original control architecture.

FAQ

Q1. How to troubleshoot if the module fails to start?

Check PLC rack power supply and install state, the CPU module and program status, confirm whether there is a processor failure.

Q2. The PLC can't communicate with the module?

Check DH+ line, node address, communication driver and network configuration, and use RSLinx for communication diagnosis.

Q3. Replace the former need to backup?

It is recommended to back up PLC programs, data files, I/O configuration and communication parameters in advance.

Q4. How to verify if the module is functioning properly?

Verify it through visual inspection, power-on test, CPU operation test, communication test, and RSLogix 5 program read/write test.

Why choose us

Feimu Technology has been deeply engaged in importing and supplying discontinued industrial control spare parts for many years. We use actual photos of the products as the basis for shipment and refuse to use fake pictures from the internet. What customers see is exactly what they get.

For discontinued and scarce CPUs like Allen Bradley 1785 L20C15, we have set up an independent hardware inspection station. Each module is stored with real photos of the product, screenshots of ControlNet communication tests, and aging operation data. The entire set of inspection records and vouchers can be consulted by customers.

We strictly adhere to not refurbishing or altering hardware labels, and truthfully inform the product condition. We also provide automated industry technical engineers to assist in verifying the model compatibility with the existing production line before placing an order. Urgent orders support remote video verification of the goods and priority shipment. From model verification, goods verification to later technical assistance, we provide a full chain service to help factories avoid the losses caused by refurbished parts and hidden defects in the market of discontinued spare parts.