panelmate algorithm

Can anyone explain ?

For data entry address N7:105 this formula exists ;

[?]*100*([?] >= -320)*([?] <= -50)+([?] <-320)*[N7:105]+([?] > -50)*[N7:105]

It limits the value entered by the operator to the range -32000 to -5000

[?]*100*([?] >= -320)*([?] <= -50)+([?] <-320)*[N7:105]+([?] > -50)*[N7:105]

The question mark inside the square brackets is 'PanelMate speak' for 'whatever the operator entered'.

[?]*100 evaluates to the entry times 100

([?] >= -320) evaluates to zero if the entry is less than -320, 1 if the entry is greater than or equal to -320

([?] <= -50) evaluates to zero if the entry is greater than -50, 1 if the entry is less than or equal to -50

([?] <-320)*[N7:105] evaluates to the value in N7:105 if the entry is less than -320.

([?] > -50)*[N7:105] evaluates to the value in N7:105 if the entry is greater than -50.

So, if the value entered by the operator is within range, the PanelMate writes it to N7:105. If not it writes the current value in N7:105 to N7:105 (no change). Saves you from having to add ladder logic in the PLC to test for a valid data entry form the PanelMate.

Awesome answer ... thankyou !!

You're welcome.

Now register as a member, come back often, and tell your co-workers and friends about :site:

and Steve wonders why confused people seek him out ...

It limits the value entered by the operator to the range -32000 to -5000

Click to expand...

I think Steve is not 100% correct:
it limits input value from -320 to -50 and multiplies VALID input value by 100 before writing to N7:105

Probably display and input values have 2 decmal places or so.

This is old method of input validation still used by PanelMate nowdays.

You're right Contr_conn. I should have worded it differently. The value in the PLC will be in the range of -32000 to -5000, but the operator entry must be in the range of -320 to -50.

I know that this is very unusual limiting method.
It was developed well over 12 years ago on old PM2800/2900.
That time no HMI had input value scaling/calculations before sending to PLC. Most of HMIs still coming without calculations except I think PanelView Pro

But PanelMate did not have validation so calculations were used.

I use to like PanelMate and used it for years, especially I like safe 2 step control.
But now I think it is completely outdated and many new HMI screens are much better and cheaper.