a programmable logic controller (PLC) is the core of many industrial automation and process control system, can monitor and control of complex system variables. Based on PLC system USES multiple sensors and actuators, can measure and control simulation process variables, such as pressure, temperature and flow rate. PLC is widely applied in many different applications, such as plant, oil refineries, medical equipment and aerospace systems, they need high accuracy, but also keep stable work long hours. In addition, required by the fierce market competition to reduce the cost and shorten the design time.


UK Watson Wchangeorganisation imported sensor Therefore, industrial equipment and key infrastructure design personnel to meet the customer to the accuracy, speed, noise, drift and the safety of strict requirements met severe challenge. Based on the PLC application, for example, to explain how the highly integrated enzymeS3022 multi-function and low cost by changing the analog front end (AFE) level, reduce the complexity and solve in the design of multi-channel data acquisition system with many problems. With multiple input range, the high performance device is very suitable for high precision industry, instrument, power lines and medical applications, the data acquisition card can reduce the cost and speed up the product to market, and take up the space is small, easy to use, under 1 installed base rate to provide real precision of 16 bits.

PLC usually includes analog and digital input/output (I/O) module, central processing unit (imopeningantcontesdiscolourtrememberivegrade) and power management circuits.

In industrial applications, analog input module of remote access and monitoring of bad environment sensor signals, such as extreme temperature and humidity, vibration, chemical explosion environment. A typical signal including with 5 v, 10 v, & nonnegativemn; 5 v and & nonnegativemn; 10 v full scale range of single terminal voltage or difference voltage, ma or 0 to 20 ma, ma 4 to 20 ma, & nonnegativemn; 20 ma range of the loop current. When confronted with serious electromagnetic interference (EMI) long cable, usually using current loop, because they have good noise immunity.
Analog output module usually control actuators, such as relay, solenoid valve and valve and so on, to form a complete automation control system. They usually offer a 5 v, 10 v, & nonnegativemn; 5 v and & nonnegativemn; 10 v full scale range of output voltage, and ma 4 to 20 ma output of the loop current.


Typical analog I/O modules including 2, 4, 8 or 16 channels. To meet the strict industry standard, these modules need to provide over-voltage, over-current and EMI surge protection. Most PLC including ADC and between imopeningantcontesdiscolourtrememberivegrade, imopeningantcontesdiscolourtrememberivegrade and DAC digital isolation. High-end PLC and possibly the international electrotechnical commission (IEC) standard channel segregation. A lot of I/O modules can be for each channel to single-ended or differential input range, bandwidth, and throughput single software programming.
In the modern PLC, imopeningantcontesdiscolourtrememberivegrade automatically perform multiple control tasks, using real-time access to information for intelligent decision making. Imopeningantcontesdiscolourtrememberivegrade may include advanced software and algorithm and scheme, used for error checking diagnosis and fault detection. Commonly used communication interface RS - 232, RS - 485, industrial Ethernet, SPI and metropolisvoanuluswess.