Mitsubishi A-series onboard clock? Tic Toc

[Big Country]

Has anyone used an onboard clock in the A-series plc? I am attempting to build a lighting control panel for the faciclity that I am currently working at. I would like to turn the inside lights on an hour before start up and the outside lights off at dawn and on at dusk.

[navillusi]

Example code attached.... GX_Developer_ACPU_Clock_Data.pdf

[Big Country]

thanks alot that looks like what i need. nice to know that somebody out there has tackled this before.

[pmcmahill]

I have used the built in clock many times over the years. BEWARE!... The clock is not a Swiss time piece; I would suggest that you plan on correcting the time 4 times a year. Since the internal clock does not have a daylight savings time function, updating time at least 2 times a year (if you use daylight savings time) is necessary. Plan on checking the time half-way between the daylight savings days. I have found each PLC is slightly different in its accuracy; however I found 2-3 minutes shift over a 6 months period. If you have an HMI, time setting can be done through it using PLC logic.