woodys1
Lifetime Supporting Member
I need help in setting up a 12hr clock on a slc500. Any help would be greatly appreciated.
12hr clock
- Thread starter woodys1
- Start date
Ken Roach
Lifetime Supporting Member + Moderator
There's a very nice 24-hour clock built into the Status file of the SLC-500 controllers.
What exactly do you need to do ?
What exactly do you need to do ?
- Ken Roach,I need to devise a SLC 5/03 program that will implement a 12 hour clock. The hours should be consistent with a real clock in that they go from 1 - 12. Also use output o:2/00 as an AM/PM indicator. Address 0:4.0 is the address of the digital display. Display the time according to the following arrangement:
Input Pressed Display
1:1/07 Hours
1:1/10 Minutes
Both or neither Seconds
of the above
Whoever set this as project work should know that a 12-hour clock goes from 00:00 to 11:59, so the hours don't go from 1-12, but from 0-11
Take a look at the Real-Time clock data in the Status file as Ken has pointed you to. In there you will find the data that you can now write code to manipulate, according to the problem presented to you.
What have you done so far? Can you post what you have done?
Ken Roach
Lifetime Supporting Member + Moderator
Okay, sounds like a neat little project.
First, the AM/PM indicator.
The actual Hours value is in the Status register S:40 and goes from 0 to 23. Since you know the hours 0 through 11 are AM and the hours 12 through 23 are PM, you can use a Limit (LIM) instruction or a pair of Greater Than or Equal To (GEQ) and Less Than or Equal To (LEQ) instructions to set the "PM" indicator.
Next, the "Hour" value. Because of the way we express hours in civilian 12-hour parlance, you're going to need to subtract 12 from the PM hours, and add an exception for the hour between midnight and 1 AM.
If you can think it through and express it, then Forum members can help you put it into SLC-500 instructions.
First, the AM/PM indicator.
The actual Hours value is in the Status register S:40 and goes from 0 to 23. Since you know the hours 0 through 11 are AM and the hours 12 through 23 are PM, you can use a Limit (LIM) instruction or a pair of Greater Than or Equal To (GEQ) and Less Than or Equal To (LEQ) instructions to set the "PM" indicator.
Next, the "Hour" value. Because of the way we express hours in civilian 12-hour parlance, you're going to need to subtract 12 from the PM hours, and add an exception for the hour between midnight and 1 AM.
If you can think it through and express it, then Forum members can help you put it into SLC-500 instructions.
And "PM" stands for "Post Meridian", so you only need a single "Greater Than" (GRT) Instruction to test for PM
OkiePC
Lifetime Supporting Member
woodys1 said:
This is pretty close to a program.
1) You need to get a copy of the clock hours (S:40), and when GRT-er than 12, SUB-tract 12.
2) When Input I:1/07 is on (assuming a N.O. pushbutton) MOV your internal N register for hours to O:4.0
3) When normally open PB I:1/10 is on, MOV the s register (S:41) to the destination O:4.0
4) When [I:1/07 AND (series XIC instructions) I:1/10]<-one branch are both on OR (other branch) they are both off (XIO instructions), MOV S:42 to O:4.0
Now, you have 90% of a program.
3 trainers, 8 students !!!! omg
OK, I'll try to make it easy....
a> S:40 contains the HOURS in 24-hour format, 0-23
You will need to MOV this to an internal register, eg. N7:0.
then check the internal register to see if it is greater than 11, and subtract (SUB) 12 if it is. Branch round the SUB to OTE the bit used to indicate "PM"
b> you don't need to move the minutes from S:41, or the seconds from S:42
c> now set up some rungs to MOV the data you now have to the output O:4.0
If "minutes" button pressed - MOV the minutes data, S:41
If "seconds" button pressed - MOV the seconds data, S:42
If neither pressed - MOV the adjusted hour, N7:0
OK, I'll try to make it easy....
a> S:40 contains the HOURS in 24-hour format, 0-23
You will need to MOV this to an internal register, eg. N7:0.
then check the internal register to see if it is greater than 11, and subtract (SUB) 12 if it is. Branch round the SUB to OTE the bit used to indicate "PM"
b> you don't need to move the minutes from S:41, or the seconds from S:42
c> now set up some rungs to MOV the data you now have to the output O:4.0
If "minutes" button pressed - MOV the minutes data, S:41
If "seconds" button pressed - MOV the seconds data, S:42
If neither pressed - MOV the adjusted hour, N7:0
GRT-er than 11 Okie
OkiePC
Lifetime Supporting Member
Nah, when it's 12:30, I don't wanna see 00 when I push the hours button!
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