17 expansion modules can be linked, up to 248 digital I/O points or 35 analog I/O points. 13K bytes of program and data storage space. 26 independent 30kHz high speed calculators, 2 independent 20kHz high speed pulse outputs, with PID controller. 3Two RS485 communication programming ports with PPI communication protocol. 4The I/O terminal block can be easily removed as a whole. 5Control system for higher requirements, with more input and output points, stronger module expansion capability