IEC 61131-1 pdf download Programmable controllers – Part 1 : General information 1 Scope This Part of lEC 61131 applies to programmable controllers (PLC) and their associated peri-pherals such as programming and debugging tools (PADTs), human-machine interfaces(HMIs)，etc.，which have as their intended use the control and command of machines andindustrial processes. PLCs and their associated peripherals are intended to be used...