Client wants to control pumps based on day of the week

Hey guys,

I have a client that has a pump they want to control based on what day of the week it is. As in, on Monday have the pump turn on at a certain hour and minute, and then turn off at a certain hour and minute. Same thing on Tuesday, Wednesday, etc. Problem is, is it possible to determine what day of the week it is? HMI is Wonderware InTouch, PLC is Allen Bradley ControlLogix.

Unfortunately I'm not seeing anything that would indicate what day of the week it is, in either HMI or PLC. It sounds so simple on paper, but I'm seeing a huge amount of work to possibly make this work. Any ideas?

http://www.plctalk.net/qanda/showthread.php?t=101840
http://www.plctalk.net/qanda/showthread.php?t=106252


A couple of threads to get you on the right track

What I do, if the PLC is always powered on it is easier, is when the hour & minute are 0 for a ONS I add 1 to my day of week DINT. When it reaches 7 MOV 0 on the next branch.

At commissioning all I have to do is make sure the value is correct. Then I check the value in 7 rungs and set a bit "TodayIsSunday" or the proper day.

If the PLC is powered down overnight or over the weekend, you will have to program in some logic to know the last day you set the value and compare to the date at power up and change it enough times for the number of days off.

Or, have the value settable on the HMI and at power-up make the value -1 and if -1 don't change it or do anything looking at it until the operator sets the value.

Hello
Not sure how good these CLX are, but if it supports DATE_TO_ULINT then this function returns the day 1-7 are Monday to Sunday

Pp

RA RSLogix/Studio 5000 provides a DayOfWeek.L5X as part of their software Samples.
Check your local drive - C:\Users\Public\Documents\Studio 5000\Samples

It also includes logic adjustments for Leap Year as well as 400 Year Century.

Thanks guys! I'll check out the info provided here and see what I can come up with.

Here's one I adapted from the Rockwell one. I import into all my projects.

It sets your day of week as a number and name.

Tells you what week number you are on too for that year.

May or may not be usefull for you.