EREMA controller, German EREMA model, EREMA price

The EREMA controller is an electronic system for digital arithmetic operations, specifically designed for industrial environments. It uses a programmable memory to execute instructions for stored logic operations, sequential control, timing, counting, and arithmetic operations. It controls various types of mechanical equipment or production processes through digital or analog input (I) and output (O) interfaces. The programmable controller was developed based on electrical control technology and computer technology, gradually evolving into a new type of industrial control device with a microprocessor at its core, integrating automation technology, computer technology, and communication technology. The PLC has been widely used in the automatic control of various production machinery and processes, becoming one of the most important, widespread, and frequently applied industrial control devices. It is recognized as one of the three pillars of modern industrial automation (PLC, robots, CAD/CAM).

EREMA Controller Classification

1) Non-networked door controller: A single unit manages one door. It cannot be controlled via PC software, nor can records be viewed; control is performed directly through the controller. Features include low price and simple installation and maintenance. However, records cannot be viewed. It is unsuitable for locations with more than 50 people or high personnel turnover (frequent hiring and resignations), and unsuitable for projects with more than 5 doors. 2) Networked door controller: An access control type that communicates with a computer, allowing direct management via software, including card and event control. Benefits include convenient management, centralized control, record viewing, and data analysis for other purposes. Features include higher price and increased installation and maintenance difficulty, but simple training and value-added services such as attendance tracking. Suitable for projects with many people, high mobility, and many doors. 3) TCP/IP network door controller: Also known as Ethernet networked access control, this is a networkable access control system that connects the computer and controller via network cables. In addition to all the advantages of networked access control, it offers faster speed, simpler installation, greater networking capacity, and cross-regional or cross-city networking. However, equipment costs are high, and computer networking knowledge is required. Suitable for large projects, locations with many people, speed-sensitive applications, and cross-regional projects.

EREMA Controller Structure

1) Central Processing Unit (CPU): The Central Processing Unit (CPU) is the control center of the PLC, serving as its neural core. Each PLC system has at least one CPU. It receives and stores user programs and data entered via the programmer according to the functions assigned by the PLC system program; checks the status of the power supply, memory, I/O, and watchdog timer, and diagnoses syntax errors in the user program. When the PLC is running, it first scans and receives the status and data from field input devices, storing them in the I/O image area. It then reads the user program line by line from the user program memory, executes logical or arithmetic operations as per the instructions after command interpretation, and sends the results to the I/O image area or data registers. After all user programs are executed, the output states from the I/O image area or data in the output registers are transmitted to the corresponding output devices. This cycle continues until operation stops. To further improve PLC reliability, large PLC systems use dual CPU redundant systems or triple CPU voting systems. Thus, even if one CPU fails, the entire system continues to operate normally. CPU speed and memory capacity are important parameters of the PLC, determining its operating speed, I/O quantity, and software capacity, thereby limiting the control scale. 2) Memory: System program memory stores system software; user program memory stores PLC user applications; data memory stores intermediate states and information during PLC program execution, equivalent to the RAM of a PC. 3) Input/Output Interface (I/O module): The interface between the PLC and electrical circuits is completed through the input/output section (I/O). The I/O module integrates the PLC I/O circuitry. Its input latch reflects input signal status, and output points reflect output latch status. Input modules convert electrical signals into digital signals for the PLC system, while output modules do the reverse. I/O modules include digital input (DI), digital output (DO), analog input (AI), and analog output (AO). 4) Communication Interface: The main function of the communication interface is to enable data exchange (communication) between the PLC and external devices. Communication interfaces come in various forms, with the most basic being standard serial interfaces such as UBS, RS-232, and RS-422/RS-485. Connections can be made using multi-core cables, twisted pair, coaxial cable, or optical fiber. 5) Power Supply: The PLC power supply provides working power to the PLC circuit and plays a crucial role in the entire system. A good, reliable power supply system is the most basic guarantee for the PLC. Generally, if AC voltage fluctuation is within +10% (+15%), the PLC can be connected directly to the AC mains without additional measures. Power input types include: AC power (220VAC or 110VAC) and DC power (commonly 24VDC).

EREMA Controller Features

1) High reliability and strong anti-interference capability: The PLC replaces a large number of intermediate relays and time relays with software, leaving only a small amount of hardware related to inputs and outputs. Wiring can be reduced to 1/10~1/100 of that in relay control systems, significantly reducing failures caused by poor contact. High reliability is a key performance metric for electrical control equipment. The PLC uses modern large-scale integrated circuit technology, strict manufacturing processes, and advanced internal anti-interference techniques, resulting in high reliability. For example, the average mean time between failures (MTBF) for the Mitsubishi F series PLC is as high as 30 hours. Some PLC systems using redundant CPU have even longer MTBFs. Regarding external PLC circuitry, compared to relay contactor systems of similar scale, electrical wiring and switch contacts are reduced to hundreds or even thousands of times less, greatly lowering failure rates. Additionally, the PLC features hardware self-diagnosis for faults, issuing alarm information promptly when issues arise. In application software, users can also incorporate self-diagnostic programs for peripheral devices, providing fault self-diagnosis protection for circuits and equipment other than the PLC. Thus, it is no surprise that the entire system exhibits extremely high reliability. 2) Complete hardware support, comprehensive functions, and strong applicability: The PLC has evolved into a series of products in various sizes (large, medium, and small), standardized, serialized, and modularized. It is equipped with a wide variety of hardware devices for user selection, allowing flexible and convenient system configuration to create systems with different functions and scales. PLC installation and wiring are also convenient, typically using terminal blocks for external connections [3]. The PLC has strong load-driving capability, capable of directly driving general solenoid valves and AC contactors, suitable for industrial control applications of various scales. In addition to logic processing, modern PLC units mostly have comprehensive data arithmetic capabilities, suitable for various digital control fields. Numerous PLC function units have emerged, allowing the PLC to penetrate various industrial controls such as position control, temperature control, and CNC. Enhanced PLC communication capabilities and developments in human-machine interface technology make it very easy to use the PLC to compose various control systems. 3) Easy to learn and use, popular among engineering technicians: As a general-purpose industrial control computer, the PLC is industrial control equipment oriented toward industrial and mining enterprises. Its interfaces are easy to use, and its programming language is easily accepted by engineering technicians. Ladder diagram symbols and expressions are quite similar to relay circuit diagrams. Using only a few PLC digital logic control instructions, relay circuit functions can be easily implemented. This opens a convenient door for those unfamiliar with electronic circuits, computer principles, and assembly language to use computers for industrial control. 4) Easy to modify: System design, installation, and debugging require little workload, maintenance is convenient, and modifications are easy. PLC ladder programs generally adopt sequential control design methods. This programming method is regular and easy to master. For complex control systems, ladder diagram design time is much less than designing relay system circuit diagrams. The PLC replaces wiring logic with stored logic, greatly reducing external wiring of control equipment, significantly shortening the design and construction cycle of control systems, and making maintenance easier. More importantly, it makes it possible to change the production process of the same equipment by changing the program. This is very suitable for multi-variety, small-batch production scenarios. 5) Small size, light weight, and low energy consumption: Taking ultra-small PLC units as an example, recently produced models have base dimensions smaller than 100mm, equivalent to only a few relays in size, thus reducing the cabinet volume to 1/2~1/10 of the original. Its weight is less than 150g, and power consumption is only a few watts. Due to its small size, it is easily installed inside machinery, making it an ideal controller for mechatronics integration.

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