Concatenating strings in SLC5/05 controllers

[gromit 4]

How can I concatenate strings into string files as follows.
Any time an event occurs, I want an entry in the string file that includes date/timestamp from real time clock, and also an integer number that correlates with the first out or cause of the event.
The integer can be anywhere from 1 to 25, and possibly 100 to indicate the trip has cleared.
I would like it to be able to maintain the last 20 events.
Please advise.
An enhancement to this would be to type out the cause next to the date/timestamp, based on the value of the integer word.
Such as... 
if N7:0 = 1
"21/11/2020 15:32:24 Tank-1  Level High-High"
if N7:0 = 4
"20/11/2020 11:12:04 Tank-2  Temperature High-High"
if N7:0 = 2
"17/11/2020 05:31:02 Tank-1  Level Low-Low"
if N7:0 = 1
"17/11/2020 03:22:12 Tank-1  Level High-High"

Edited 22 Nov 2020 by gromit

[Criticore 0]

You will need to use the ACN function to concatenate two strings. You can stack this by just placing that string into a buffer then doing it again.

I believe you will need to use the status bits to get the Date and time though. 

Send me a message if you get stuck and I can help you through it.

Edited 23 Nov 2020 by Criticore

[gromit 4]

Criticore,
Thanks for your response.
I was able to create the basic logic to convert the dd+mm+yyyy , hh+mm+ss and trip number to strings and then concatenate into a string, as follows (21112020 : 153550 > 12)...

 BST AIC S:39 ST78:0 NXB AIC S:38 ST78:1 NXB AIC S:37 ST78:2 NXB AIC S:40 ST78:3 NXB AIC S:41 ST78:4 NXB AIC S:42 ST78:5 NXB AIC N77:10 ST78:9 BND 
  BST LES N77:10 999 XIC N77:0/0 NXB XIC N77:0/15 BND OSR N77:0/3 BST CTU C5:77 20 18 NXB GRT C5:77.ACC 20 RES C5:77 NXB ACN ST78:0 ST78:1 ST78:10 NXB ACN ST78:10 ST78:2 ST78:11 NXB ACN ST78:11 ST78:7 ST78:12 NXB ACN ST78:3 ST78:4 ST78:13 NXB ACN ST78:13 ST78:5 ST78:14 NXB ACN ST78:12 ST78:14 ST78:15 NXB ACN ST78:15 ST78:8 ST78:16 NXB ACN ST78:16 ST78:9 ST78:17 BND 
The output is basic and ugly as follows, (dd+mm+yyyy+:+hh+mm+ss+>+trip number)(21112020  : 153550 > 12) and I would like to enhance it, but the current issue is that I am not able to figure out how to maintain the last 20 events.
I tried using a counter to save the last 20 events into 20 contiguous string registers, but am not able to use indirect addressing to save the results to ST78:20 through ST78:40.
Any assistance would be appreciated.
Thanks.

Edited 23 Nov 2020 by gromit

[gromit 4]

On 11/23/2020 at 0:28 PM, gromit said:

Criticore,
Thanks for your response.
I was able to create the basic logic to convert the dd+mm+yyyy , hh+mm+ss and trip number to strings and then concatenate into a string, as follows (21112020 : 153550 > 12)...

 BST AIC S:39 ST78:0 NXB AIC S:38 ST78:1 NXB AIC S:37 ST78:2 NXB AIC S:40 ST78:3 NXB AIC S:41 ST78:4 NXB AIC S:42 ST78:5 NXB AIC N77:10 ST78:9 BND 
  BST LES N77:10 999 XIC N77:0/0 NXB XIC N77:0/15 BND OSR N77:0/3 BST CTU C5:77 20 18 NXB GRT C5:77.ACC 20 RES C5:77 NXB ACN ST78:0 ST78:1 ST78:10 NXB ACN ST78:10 ST78:2 ST78:11 NXB ACN ST78:11 ST78:7 ST78:12 NXB ACN ST78:3 ST78:4 ST78:13 NXB ACN ST78:13 ST78:5 ST78:14 NXB ACN ST78:12 ST78:14 ST78:15 NXB ACN ST78:15 ST78:8 ST78:16 NXB ACN ST78:16 ST78:9 ST78:17 BND 
The output is basic and ugly as follows, (dd+mm+yyyy+:+hh+mm+ss+>+trip number)(21112020  : 153550 > 12) and I would like to enhance it, but the current issue is that I am not able to figure out how to maintain the last 20 events.
I tried using a counter to save the last 20 events into 20 contiguous string registers, but am not able to use indirect addressing to save the results to ST78:20 through ST78:40.
Any assistance would be appreciated.
Thanks.

I was able to enhance the output to display one of 24 different causes, rather than just the trip number.
such as Tank-1 Level Hii-Hi, Tank-2 Level Low-Low, FSL-101 Flow Low, etc.
Now I just need help with maintaining the last 20 or so events.
I tried using indirect addressing to save the string to 20 contiguous string registers, but it says that the ACN instruction doesn't allow indirect addressing.
ANY IDEAS?

[gromit 4]

I was able to get it to work by using a counter and indirect addressing on a COP instruction, rather than an ACN instruction.

Everything is working now.