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hello dear friends. one question has been in my mind for some years and i have not found an answer for it till now. suppose you want to write plc program(s7-300) for a new machine from beginning. this machine have many cylinders,motors,valves and etc. my question is that how you write plc program for each part to avoid confusing? Do you consider an fc for each part(for example:electric valves)? In most of programs i have seen that the programmer write whole cycle of machine in one fc and this fc communicate with other FCs. this fc called "sequencing". how do you write plc program? do you write sequencing program? please please share your experiences. best regards.

hello. i have read most of manuals about wincc flexible but i am confused about the runtime. suppose i want to use wincc flexible runtime on my pc as hmi and communicate with s7-300 cpu and use cp5611 a2 on the pc as an interface. please confirm my understanding: 1)create wincc flexible project and in "connection" tab select mpi network and s7-300 as controller and pc677(for example) as op. 2)set "pg/pc interface" to cp5611(mpi). 3)connect mpi cable to cpu mpi port and other end to cp5611a2 card. 3)compile and save the project on wincc flexible and run .fwx file. i have another question: Should i use hmi station on simatic manager software to be able connect the wincc flexible runtime to s7-300 cpu(is a must?) please please answer me if there is any problem in my understanding. best regerds