Allen Bradley 1747-L20B is a processor in the Rockwell SLC 500 series. It was a very popular PLC product at that time. Although there are now more advanced ControlLogix series, this old model is still the core controller in many old equipment. Its main function is to execute the programs you have written, controlling various actions of the machine, such as starting the motor and lighting the indicator lights. All these actions must follow its instructions. Because many old equipment still cannot do without it, it is very crucial to find a reliable supplier when you need to buy replacement parts. We guarantee that every product we provide is original and brand new, with sufficient inventory, and can ensure this old buddy to continue working stably on your production line.
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CPU brain: |
It houses the processor and memory, responsible for thinking and remembering your "script". Power heart: It comes with a 120/240V AC power supply, providing energy to the entire system. |
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Input ports (12): |
24V DC, used to "listen" to external signals, such as when sensors detect something or someone presses a button. |
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Output ports (8): |
Relay outputs, used to "give orders", directly starting contactors, lighting indicator lights, and other "physical tasks". |
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Communication mouth: |
Standard with one DH-485 port, used to "chat" with touch screens (HMI), other PLCs, or your computer. |
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Expansion slots (3): |
These are its "external attachment positions". Feeling that your hands and feet are not enough? You can plug in various expansion modules, such as adding more input and output ports, or adding a module that can handle temperature and pressure, making it more capable. |
1.The Allen Bradley 1747-L20B excels at logical reasoning. Just like thinking in one's mind, "If this sensor has a signal and that button has been pressed, then start this motor", this kind of task is what it does best.
2.It can make the equipment work in an orderly manner. For assembly, filling, and packaging on the assembly line, it can make the machines follow the steps you set step by step, ensuring no mistakes.
3.It has built-in timing and counting functions. For example, "Let the motor run for 10 minutes and then stop", or "Notify me when the 100th product is reached", these are a piece of cake for it.
4.It can perform simple arithmetic operations. Addition, subtraction, multiplication, and division, as well as data transfer, it can do. This makes the control smarter.
5.It can also chat via the Internet. Through its DH-485 interface, it can be connected to touch screens and upper computers, allowing you to see the situation on the production line from your office and even operate remotely.
1. We have completely bid farewell to the "relay forest". Previously, a complex machine was accompanied by a wall full of relays and wires, resembling a spider web. The Allen Bradley 1747-L20B replaced them with software programs, making the cabinet smaller while improving reliability. Changing the logic only requires a few clicks on the computer.
2. Maintenance no longer becomes a headache. If the relay cabinet broke down before, electricians had to check each wire one by one with a multimeter, sweating profusely. But with PLC, it has a fault diagnosis function. If it detects a problem, it will tell you right away, significantly reducing downtime.
3. Equipment upgrading and renovation is extremely convenient. If the production line wants to add some new functions, for it, it's just a matter of modifying the program or adding an expansion module. It saves money and time, and doesn't require completely rebuilding the entire system.
As a product from the well-known brand Rockwell (A-B), the Allen Bradley 1747-L20B’s quality has been tested over several decades. Firstly, it is extremely durable and robust, designed specifically for the dirty, noisy and shaking environment of factories. It is highly durable and many machines have remained in use without replacement since they were installed. It can be regarded as a "model worker". Secondly, it is of standardized design and the programming software RSLogix 500 is mature and stable. Engineers all over the world can basically use it. There are plenty of materials and tutorials available, and there is no shortage of people who can repair it. Finally, its reliability is extremely high. The average downtime is very long, which makes it reassuring to use. It won't cause problems for you frequently and will allow you to carry out production smoothly.
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