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What is the main difference between Yanhua 4000 and 5000?
Yanhua 4000 is a remote I/O module, which works independently and exchanges information with PC mainly through 485 communication.

Advantech 5000 is PAC series, similar to PLC, and it is a system with CPU, which can judge and output.

4000-5000 can communicate and integrate.

The following is official website information:

ADAM-5000 computer architecture controller (including ADAM I/O series and ADAM-5550KW Micro PAC) is equipped with AMD Geode GX533 CPU, which has special control functions, such as watchdog timer, battery backup RAM and deterministic I/I/O..ADAM-5550KW computer architecture controller supports the use of five standards IEC 611in CE 5.0 environment. With optional man-machine interface software and built-in VGA port, this ADAM I/O can avoid using additional SCADA computers in the application. This lightweight and powerful ADAM-5550KW micro PAC is the best choice for applications with up to 256 I/O points.

As an international leader in designing and manufacturing data acquisition I/O modules, Advantech provides complete independent data acquisition modules, which are widely used in many industrial applications, such as facility monitoring, environmental monitoring and industrial process control. Advantech's distributed remote I/O modules are divided into Ethernet I/O (ADAM-6000 series) and RS-485 I/O (ADAM-4000 series), and are subdivided into analog I/O and digital I/O modules, some of which support Modbus communication protocol.