HELP NOT NEEDED - Enjoy this Rs500 prg

.....I do not need help with this ....
this program is running - sort of - on an existing
machine. apparently came from South Australia
(900 Km's east)it has been running with this fault for three years. RS 5/03

interesting maths - search for N7:0


this is a dual hydraulic press (4 plattens two per die set)
controlled with 4 Analogue outputs to Proportionate valves
Using 4 analogue Inputs - Linear Pots - each connected to
one platten.

THE OPERATION
All four Plattens are fluctuating back and forward (1st Slide)
or Up and down (2nd Slide) by about 10~20mm
Both Open and Closed positions

ENJOY

It appears all those instructions that use N7:0 are "do nothing" dummies.

not quite
instead of using SCP they are calculating the platten position preset from a HMI keypad.
the actual monitored value of N7:0 if +/- 37625
N7:0 is used to multiply by -1 in some cases
And as an addition value and as a subtraction value
all at the same time
for 4 different devices

Are any of the results using N7:0 really used for anything?

yes they are controlling the plattens - as far as i can tell they are using the scan order of the processor to control the machine.
N7:0 is used both through XIO/C contacts as well as directly on.
Even as a transitional value -eg n12: x N7:0 = N7:0 x N14 etc
it is working but oscillates 10~15 mm at all stop points - Amusing really.
I am still working through the program - off line - Labeling and documenting. - I'll post that later.

look at O:10.0, O:10.1 also

iant said:

look at O:10.0, O:10.1 also

Click to expand...

Thanks for sharing.
I think that the instruction gets jumped over in rung 001 Lad 18?

The Outputs O:10.0 O:10.1 O:11.0 and O:11.1 are the Analogue output cards.
so no it is not jumped there
it has been fun so-far