Mitsubishi FX3u - Counters and Timers

[BenJones 1]

Hi All, Just a quick question. I am programming an FX3u with IEC developer and I need to use some sort of function to calculate the running time of a machine (in hours). This machine will be switched on and off and I need an additive way to read the amount of hours the machine has been running for. Can this be done with a timer or counter ? Any help would be useful Best wishes, Ben

[kaare_t 155]

Simply make your own small timer. By making one of your own you'll have better control and higher flexibility than using timers/counters. Remember to use battery-backed up registers to ensure that the values are stored when turning off the PLC.

[BenJones 1]

BRILLIANT !!! Thanks Kaare ! That works really well Just showed my boss and he's impressed too...I owe you one ! I've also found the back-up battery 'latched' registers which are D200-D299 so I've used them Great stuff. Ben

[kaare_t 155]

No problem and thanks for the feedback //Kaare