CJ1M Clock Timing Issue

[denise01 3]

Hello, I am using the example clock programme to take timings from my CJ1M PLC in order to turn on and reset counts for my factory production output I use a compare function eg >= (325) and <=(315) in order to make these points. Trouble is I require certain points to be reset at one minute past the hour and so timings fro clock have to be precise. I have noticed that time on D103 is approx 4 minures out so therefore cant be used. I have synchronised plc to pc and still problem any advice would be appreciated. Regards Peter clock timing.cxp

[chelton 66]

What is the purpose of the ORW D102 D101 D102 in the example posted? Regards Chris

[denise01 3]

[denise01 3]

Hello Chris, D 103 displays the plc hour and minute combined in BCD form I use this to compare with set timings that I need to switch on or reset a counting function. So I need to reset an hourly total at one minute past the hour. I us a = 300 function. The problem I have is that the pllc clock is not accurate enough for this purpose. I wonder if it is the scanning speed that affects it. In other words if I set a compare to activate at one minute past five the D103 reading will not remain constant with the timing of the pc clock. If you want I can post the programme so you can see the full picture. Regards Peter

[BITS N BYTES 66]

Set up a oneshot when Minutes and Seconds both equal 0, Hour Oneshot.cxp

[denise01 3]

Hello Sparky, Am not familiar with these functions, if I wanted an output to come on at one minute past five in the afternoon how would I utilise the functions that you have provided. Regards Peter

[denise01 3]

Sorry Bits and Bytes have just finished work of course I am sparky. Many Thanks Peter