As a compliant industrial control supplier, Feimu Technology conducts comprehensive aging tests on each controller for communication, memory, and logic scanning, eliminating defective products from maintenance and refurbishment, to ensure the continuous and stable operation of the production line.
The Allen Bradley 1785 L26B model comes with built-in hierarchical permission encryption protection, which can lock the core process programs to prevent tampering. It is equipped with battery backup memory to ensure that the programs are not lost in case of power failure. This model has already been discontinued by the original manufacturer. The refurbished units available on the market often have problems such as capacitor aging and communication port failures, which can easily cause the entire control system to stop running.
Allen Bradley 1785 L26B boasts high reliability: The PLC-5 series has undergone extensive industrial field testing and is suitable for continuous operation of automated equipment.
Supports DH+ network communication: It can communicate with other PLC-5 controllers, PanelView HMI, programming terminals, and other devices.
Extremely powerful expansion capabilities: Supports 1771 series digital, analog, and intelligent I/O modules.
Storage protection function: Uses batteries to maintain SRAM and supports EEPROM backup to enhance the reliability of program storage.
Suitable for replacing spare parts of old systems: Often used to maintain the operation of old equipment to avoid the downtime costs caused by upgrading the entire control system.
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Parameters |
Specifications |
|
Processor Type |
PLC-5/26 Protected Processor |
|
User Memory Capacity |
16K Words SRAM |
|
Memory Type |
Battery-Backed Static RAM |
|
Program Backup |
Supports EEPROM Module (1785-ME Series) |
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Maximum I/O Capacity |
512 Points (Any Combination) |
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Complementary I/O Capacity |
512 Inputs + 512 Outputs |
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Maximum Analog I/O |
512 Channels |
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Communication Interfaces |
1 DH+ Port, 1 DH+/Remote I/O Port |
|
Maximum I/O Rack Capacity |
13 I/O Racks (Up to 12 Remote Racks) |
|
I/O Scan Time |
Approx. 10 ms (57.6 kbps) / 7 ms (115.2 kbps) / 3 ms (230.4 kbps) |
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Controller Installation Location |
Left Slot of 1771 I/O Chassis |
|
Backplane Power Consumption |
Approx. 2.6 A @ 5V DC |
Mainly using: RSLogix 5
6200 PLC-5 Programming Software (Early System)
Supported features:
Ladder Logic
Data table editing
Online monitoring Fault diagnosis
Common download methods:
DH+ network download
PLC programming via serial port connection
Restoring the program using EEPROM
Before downloading, it is necessary to confirm:
The PLC is in the Program mode
The communication driver is correctly configured
There is no conflict in the node address
The program file matches the CPU type
Since the CPU uses the battery to maintain SRAM, battery failure may cause:
Loss of program; loss of data files; CPU failure alarm; inability to enter the RUN state upon power-on Suggestion:
Regularly check the BAT indicator light; replace the battery when in operation; keep the EEPROM backup
The Allen Bradley 1785 L26B does not have an Ethernet interface by itself.
If you need to connect to a modern Ethernet/IP system, usually you need:
DH+ Ethernet gateway
PLC-5 Ethernet module
Third-party protocol conversion equipment
It cannot be directly connected to the ControlLogix EtherNet/IP network.
The main reasons are:
A large number of industrial equipment is still running the PLC-5 system
The cost of replacing the entire control system is high
The risk of downtime for upgrading is high
It is necessary to maintain compatibility with the original program
Since the Allen Bradley 1785 L26B belongs to an older model of PLC-5, the manufacturer has stopped production. When continuing to use it, it is recommended to:
Regularly back up the PLC program;
Replace the aging batteries;
Prepare a backup CPU;
Check the quality of the DH+ network communication;
For long-term projects, consider migrating to the Rockwell Automation ControlLogix platform.
For the outdated PLC processors, it is difficult to find original equipment parts after they are discontinued. The cost of fault shutdown and maintenance is extremely high. Our company has been deeply involved in the full series of PLC-5 products for many years. As a reliable supplier, we have specially reserved 1785 L26B in stock that has passed the whole machine test. The delivery cycle is short. At the same time, we provide technical assistance for program download and old system configuration connection, so that the equipment does not need to be completely renovated, and the controller replacement and maintenance can be completed at a low cost.
Address
No. 26, Yuhu Street, Encheng Subdistrict, Enping City, Jiangmen City, Guangdong Province, China
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