Created Date: February 27,2016

Created by: kewakl

I have a sensor I want to create trend data for. To graph to my Cmore panel from a Click plc. a For-Next loop would be perfect for this however I do not see a way to index the addresses. that leaves the only option of creating a rung(or three) for each point of data. And a subroutine is out since I'm already in one but even then I would have to create a rung for each address. That would mean 100-200 rungs just for a chart. Is there another way to accomplish this without changing plc's?

The whole action of a ForNext loop happens in ONE scan .

You can create your own index in a ForNext loop.

Rung 1

Clears any existing count in the LoopCount

Sets an origin for the beginning of destination into DF for your samples

Rung 2

Begins the ForNext Loop with a max of 10 (DS1)

Rung 3

Tracks the loop count (not including the ZERO count)

Rung 4

Calcs the offset into DF for the destination

Rung 5

Copies the Source (DF1) to DF through DF

-where and equate to the value of DS3 at that count in the ForNext loop

Rung 6

Terminates the ForNext loop

I am not sure whether the FOR instruction or the NEXT instruction provides the internal increment/evaluation of the ForNext loop's index, so I did not attempt to describe that.

This snippet assumes that your scaled input for analog resides in DF1, and you wish to log that into DF101-DF110.

Trigger

------]^ ^

------------------------------------------ NEXT

I have NOT tested this on a real CLICK.

Created Date: February 27,2016

Created by: kewakl

this should do the opposite of my first snippet

This snippet assumes that your logged data resides at DF101-DF110. and you wish to copy it to DF1. (however useful this would be since DF1 will get overwritten 10 times each scan that the ForNext loop is enabled)

Trigger

------]^ ^ DF1

------------------------------------------ NEXT

Created Date: February 27,2016

Created by: kewakl

This should copy the desired number of items from a location beginning at DF to a destination beginning at DF (offset by 1) so it will perform a controlled/triggered block copy from DF ... to DF ... --

depending on how many times Trigger is turned on, and when Init_TEMPVars is turned on.

This lets you control the interval of the Trigger and the initialization of the temporary variables.

Be careful that your src offset does not reach into your dst range.

The red code is an dirty example of a Src/Dst/Index error trap.

Init_TEMPVars

------]^

DS1 299 Trigger

-------]>

Trigger

------]^ ^ ^ ^ DF //copy

//src to dst

A counter could be used for the DS1 math. It would require a more complicated control branching than a MATH instruction.

again, I haven't tested this on a CLICK

Created Date: February 27,2016

Created by: notfet

I did look at the program and did not see what is posted in the screen shot. I think that will do what I need, However since all I want to do in index the pointer the Hex values should be omitted correct? It seems all that is for is indexing the drum instructions in the subroutine. The for next loop is out since I will be looking at a 1sec clock(500ms on 500ms off) so here is what I end up with for the pointer.

Rung 1

Rung 2 Result DF10

Rung 3 )]

Rung 4 to 104 math for charting purposes.(Maybe I could index this as well.

I know the use of the brackets is crude please excuse them but that's the general idea correct?

Created Date: May 28,2018

Created by: tony51

I'm sure you have this figured out by now.

I 've done this, using a DS register as the pointer for indexing, say set DS101 to 300

Then on input for sample grab, I set another bit (for debounce, not needed if clock based), and copy the value I want to DD

once my debounce timer is done, if DS101 is less than max samples, add 1 to DS101

if DS101 is greater than or equal to max sample, set if back to 300 (beginning).

5 rungs, including return from subroutine and first scan to initialize to handle whatever amount of samples.

You can add a timestamp as well and do averaging, like a moving average with the same idea.

Created Date: February 26,2016

Created by: notfet

I have a sensor I want to create trend data for. To graph to my Cmore panel from a Click plc. a For-Next loop would be perfect for this however I do not see a way to index the addresses. that leaves the only option of creating a rung(or three) for each point of data. And a subroutine is out since I'm already in one but even then I would have to create a rung for each address. That would mean 100-200 rungs just for a chart. Is there another way to accomplish this without changing plc's?