lou80 Posted July 25, 2006 Report Posted July 25, 2006 Hallo out there, I would like to program devices in my PLC for counting products, lets say whenever a unit of product "P1" is fabricated counter "C1" accumulates and whenever product "P2" is fabricated counter "C2" accumulates. What I would like to know is, the influence (of adding accumulators to the original program) on the scan time, lets say in percentages of the old program scan time. The type of PLC: mitsubishi FX2c. Quote
panic mode Posted July 25, 2006 Report Posted July 25, 2006 I never used FX2C but for most plcs one can find execution time for each instruction or instruction type in the spec sheets. Can't you just try it? how many such counters we are talking about? Only two? What is current scan time? Why is scan time so critical that requires this kind of analysis? Some tasks are critical but they are not that common. Most machines will be quite ok with 10-30ms but I've seen some doing 10-15x faster or slower than that... Quote
Goody Posted July 26, 2006 Report Posted July 26, 2006 Are you perhaps thinking that by adding counters - the program time is going to be longer, therefore making the machine cycle a fraction longer and also therefore making it less productive. Quote
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