IFM controller German IFM model IFM price

The IFM controller feeds back part or all of the control system's output to the system input via specific methods and devices, compares the feedback information with the original input, and applies the comparison result to control the system, preventing deviation from the set target. Closed-loop control systems utilize negative feedback. This is an automatic control system forming a closed loop consisting of a forward signal path and a feedback path, also known as a feedback control system. Closed-loop control systems have the following characteristics in control: a deviation signal is generated by comparing the feedback quantity of the output signal with the input quantity; this deviation signal is used to control or regulate the output, allowing the system output to automatically track the input, reducing tracking error, improving control accuracy, and suppressing the influence of disturbance signals. In addition, closed-loop control systems formed by negative feedback have other advantages: the introduction of the feedback path makes the system insensitive to changes in component parameters in the forward path, thereby lowering precision requirements for components in the forward path; feedback action can also make the entire system insensitive to certain nonlinear effects.

IFM controller introduction

The controller uses microelectronics technology to perform various control functions. Under the action of input signals from the field, it controls field actuators to operate according to predetermined programs and specific rules. Based on user usage methods and characteristics, programmable controllers can be divided into two completely different markets: project-based markets and OEM markets. In the main application projects for programmable controllers, they are primarily used in industries such as metallurgy, automotive, municipal, and power; in the OEM market, programmable controllers are mainly applied in traditional industries such as textile machinery, packaging, and machine tools. The most basic and widespread application is sequential logic control, used to replace relay control systems to achieve logical and sequential control. It can be used for single-machine control, multi-machine control, and automation production line control. The PLC controls mechanical moving parts to perform corresponding operations based on operation buttons, limit switches, and other command signals provided from the field.

IFM controller applications

An automatic control system that includes power amplification and feedback, causing the output variable value to respond to the input variable value. After the CNC device issues command pulses, when the command value is sent to the position comparison circuit, if the worktable has not moved (i.e., there is no position feedback signal), the command value causes the servo drive motor to rotate, driving the machine tool worktable via transmission elements such as gears and ball screw nut pairs. A position measuring element mounted on the machine tool worktable measures the actual displacement of the worktable and feeds it back to the comparator in the CNC device for comparison with the command signal. The resulting difference is used for control. If a difference exists, it is amplified by an amplifier to further control the servo drive motor rotation until the difference is zero, at which point the worktable stops moving. This system is called a closed-loop servo system.

IFM controller advantages

In a feedback control system, regardless of the cause (external disturbances or internal system changes), as long as the controlled variable deviates from the specified value, a corresponding control action is generated to eliminate the deviation. Therefore, it has the ability to suppress interference, is insensitive to changes in component characteristics, and can improve the system's response characteristics. However, the introduction of a feedback loop increases system complexity, and improper gain selection can cause system instability. To improve control accuracy, when disturbance variables can be measured, disturbance-based control (i.e., feedforward control) is often used simultaneously as a supplement to feedback control to form a composite control system. Generally, open-loop control systems have a simpler structure and lower cost. The disadvantages of open-loop control systems are low control accuracy, poor interference suppression capability, and sensitivity to changes in system parameters. They are generally used in occasions where external influences can be ignored or precision requirements are not high, such as washing machines, stepper motor control devices, and water level regulation systems. In closed-loop control systems, whether due to changes in input signals, the influence of interference, or changes in internal system parameters, as long as the controlled variable deviates from the specified value, a corresponding action is generated to eliminate the deviation. Therefore, closed-loop control has strong interference suppression capabilities. Compared with open-loop control, the system is less sensitive to parameter changes, allowing less precise components to be used to construct a more precise control system, achieving satisfactory dynamic characteristics and control accuracy. However, using feedback devices requires adding components, resulting in higher costs and increased system complexity. If the system's structural parameters are not selected appropriately, the control process may become poor, or even exhibit unstable conditions such as oscillation or divergence. Therefore, how to analyze the system and reasonably select the system structure and parameters to achieve satisfactory system performance is a problem that automatic control theory must study and resolve.

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