12HFA51A42H PLC system module
12HFA51A42H PLC system module
GE 12HFA51A42H PLC system module
The basic components of PLC
1. Central processing unit
The central processing unit (CPU) consists of a controller, arithmetic unit, and registers integrated into a single chip. The CPU is connected to memory, input/output interfaces, programmers, and power supplies through data bus, address bus, control bus, and power bus.
The CPU of small PLCs uses 8-bit or 16 bit microprocessors or microcontrollers, such as 8031, M68000, etc., which are very affordable; The CPU of medium-sized PLC adopts 16 bit or 32-bit microprocessors or microcontrollers, such as 8086, 96 series microcontrollers, etc. The main characteristics of these chips are high integration, fast calculation speed, and high reliability; However, large PLCs require the use of high-speed chip microprocessors.
The CPU commands the PLC control system to complete various work tasks according to the functions assigned by the PLC internal system program.
2. Memory
The memory inside the PLC is mainly used to store system programs, user programs, and data.
1) System program memory
The PLC system program determines the basic functions of the PLC. This part of the program is written by the PLC manufacturer and solidified in the system program memory, mainly including the system management program, user instruction interpretation program, and functional program and system program calls.
The system management program mainly controls the operation of the PLC, making it work in the correct order; The user instruction interpreter converts PLC user instructions into machine language instructions and transmits them to the CPU for execution; Functional programs and system program calls are responsible for calling different functional subroutines and their management programs.
The system program belongs to important data that needs to be stored for a long time, so its memory uses ROM or EPROM. ROM is a read-only memory that can only read content and cannot write content. ROM is non-volatile, meaning that it can still store stored content even after the power is disconnected.
EPEROM is an electrically erasable read-only memory that requires ultraviolet light to illuminate the lens window on the chip in order to erase the written content. Electrically erasable programmable read-only memory also includes E2PROM, FLASH, etc.
2) User program memory
The user program memory is used to store the PLC application programs loaded by the user. In the early stage of loading, the user program needs to be modified and debugged, so it is called the user debugging program. It is stored in the random access memory RAM that can be read and written randomly for convenient modification and debugging by the user.
The program that has been modified and debugged is called a user executed program. As there is no need for further modification and debugging, the user executed program is fixed in EPROM for long-term use.
3) Data storage
During the operation of PLC, intermediate result data (such as status data of input/output components, preset and current values of timers and counters, etc.) and configuration data (such as input/output configuration, setting input filtering, pulse capture, output table configuration, defining storage area retention range, analog potentiometer setting, high-speed counter configuration, high-speed pulse output configuration, communication configuration, etc.) need to be generated or called. These types of data are stored in the working data memory. As the working data and configuration data are constantly changing and do not need to be stored for a long time, the RAM is used for random access memory.
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☣ About supplier
Xiamen Xingruijia Import and Export Co., Ltd.’s product content includes distributed control systems (DCS), programmable logic controllers (PLC), MOTOROLA MVME industrial modules, industrial control communication converters (Anybus), remote output/input modules (RTU), industrial computers (IPC), industrial low-frequency screens (IPC), human-machine interface SCSI (50, 68, 80Pin), AnyBus (Gateway), which has become a global sales enterprise for industrial automation spare parts and components
Our company is able to directly purchase from overseas, provide equipment and spare parts from different countries and manufacturers, solve your problems in searching for multiple places or concerns about product quality issues, etc. We have a great advantage in price, and provide detailed product information. We warmly welcome you to call or use email to inquire
management idea
We adhere to the business philosophy of “professionalism, integrity, innovation, cooperation, and win-win”, constantly exploring new products, providing customers with high-quality services, making them more satisfied, and constantly expanding new business scope
Featured services
The company has a leading advantage in discontinuing control system components. We have a large inventory and surplus of control system components, as well as some hardware for the discontinued control system. We have also released many new hardware and products to support your existing control system or apply new control technologies. The discontinued “DCS system spare parts, PLC module spare parts,” complete machine and accessory series have a strong advantage. As long as you need PLC products, we can help you find them. The company has a great price advantage
Corporate spirit
We advocate the corporate spirit of “diligence, pragmatism, exploration, and development”, and build a positive, united, collaborative, innovative and enterprising corporate culture and talent environment within the enterprise
Advantage brands
ABB Robots, FANUC Robots, YASKAWA Robots, KUKA Robots, Mitsubishi Robots, OTC Robots, Panasonic Robots, MOTOMAN Robots, etc
Allen Bradley Automation is a global strategic brand of Rockwell Automation, providing customers with a complete set of components, products, control and information platforms, as well as support services and manufacturing solutions.
Allen Bradley’s products are spread across various industrial fields, such as food processing, forestry products, plastics, automobiles, semiconductors, subways
Pharmaceuticals, tires, metallurgy, material processing, mining, water treatment, electricity and energy, printing, and oil and gas, among others
Our Advantages
✔ We only provide the original new items, 100% make Packing & Delivery
✔ We can offer you 100% original products.
✔ We will give you 100% quality assurance.
✔ We can offer you competitive price.
✔ We can make sure the quickly delivery time.
✔ We have a professional technical team.
✔ We will reply your inquiry within 12 hours.
✦ About FAQ
Q: Are you a trading company or a manufacturer?
A: Yes, we are a trading company.
Q: Do you have inventory or need to buy from other suppliers?
A: We keep a lot of inventory to sell, and we have our own warehouse.
Q: Do you provide 100% original and new products?
A: Of course. No plagiarism, no counterfeiting, no renovation! Original only! ! !
Q: Do you sell outdated products? Even a very old product?
A: If there is a new model that needs to be replaced, we will recommend you to use the new model;
if it is not easy to replace, we will help check the old one in good condition.
If used or other conditions, we will tell you the truth.
Q: How long is your delivery time?
A: If the goods are in stock, it usually takes 2-3 working days. If the quantity is large,
it will take 5-7 working days after receiving the payment.
If it is not a normal product, it always takes 3-4 weeks or 6-8 weeks to order.
✦ Application industry:
Power plants, steel mills, automobiles, petrochemicals, tobacco, metallurgy
Note: Please follow the instruction manual of this product to install and debug, so as not to damage the product
Reasons for choosing us–Seven core advantages:
Brand new imported:
All products are produced and supplied by foreign original factories
Rigorous test:
All products have been strictly tested for a long time by professional and technical personnel before delivery.
Free product consultation:
Before purchasing and after using, if you encounter technical problems with the product, we will provide you with a 24-hour service hotline for free product consultation.
One year warranty:
Brand new product is guaranteed for one year
15 days replacement:
Within 15 days, there is no reason to return or exchange for non-artificial quality problems
Order directly from the original factory abroad:
Eliminate intermediate links, minimize costs, have a large number of spot stocks, and directly suppl
Notice before purchase
1、 All prices in the store are not actual prices. If you need to know the product prices, please contact online customer service.
2、 On the day of spot payment, the goods will be shipped; Futures are calculated from the date of payment, excluding domestic and foreign holidays.
3、 If the buyer has any objections after receiving the goods through express delivery or logistics, please raise them within the day of receiving the goods.
. Before placing an order, the buyer needs to confirm the price and delivery time with the seller; If the buyer unilaterally places an order, the order will be considered invalid;
. After placing an order, the buyer is not allowed to change the product brand, specifications, quantity, unit price, etc. If the buyer provides incorrect product specifications and models, resulting in incorrect orders, the seller is not responsible for replacing the goods, returning the goods, refunding, etc., nor is it responsible for any losses caused as a result;
. After placing an order, if there are no quality issues, we do not accept returns/exchanges or refunds without reason;
. Therefore, if the product manufacturer suspends production, upgrades without 3C, increases prices, or is restricted, resulting in the inability to place orders, the order will be cancelled and the seller will not be liable for any related legal liabilities;
. Due to objective factors beyond the seller’s control, such as natural weather, transportation and freight, political and political reasons, the seller shall not be liable for any related legal liabilities resulting in delayed delivery. The buyer and seller shall negotiate whether the order is still effective.
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