PLC5 Structured Text

Hello, I am working on a project in which I need to use some spare analog inputs on a 1771 IFE card in a PLC5/20. The BTR is set up using structured text. I think N37 is the data register
to read in data for the card because this is the only BTR in the program that I can not account for, but monitoring the data file compared to the 1771IFE Manual does not seem to be correct. Only one other BTR in the program and it is writtten in ladder. I can not tell by this code which slot it is reading data from or the length. I can not find any documentation on The BTR instruction in structured text. Any help will be appreciated.I do not have documentation for this program.

IF ((S:30 <> N37:40)) THEN
F38:17 := S:30 / 1000.0;
N37:40 := S:30;
END_IF;
F38:0 := ((S:8 / 1000.0) * 0.05) + (F38:0 * 0.95);
BTR (0, 0, 0, N37:0, 0, 0, 0) ;
N37:0/15 := RETAIN(0);
F38:28 := (N37:19 + N37:43) * F38:24;
F38:20 := ((2.0 * F38:20) + ((F38:28 - F38:33) / F38:17)) / 3.0;
F38:33 := F38:28;

Never used BTR in ST, would guess the parameters are similar to the ladder version.
Does the BTR even work? Does the values in N37:0 ever change?


Is there a BTW for this module?

Post your code. The .RSP file, zip it first then post.

I have not used a block transfer instruction in structured text myself. However, generally speaking, the "block format" instructions (BTR/BTW, MSG, PID) in sturctured text follow the sequentially from the ladder instructions. I don't think it is a coincidence that the ST version you listed has the same number ofg fields as the ladder version, discounting the module type which just preloads the control word.

Keith

Keith,
You are correct. I found an example and it showed just that. As you see my code does not have anything for the Data File.
I am not sure if my RSLogix5 Ver.6.30.00 is compatible with the structured text. I will try to dig up some 6200 software next week.
Thanks
Keith