Send parameters

Quote

- Is it possible to cast from real to integer and vice versa ?

- Not sure what you mean, could you clarify this?

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- How can I allocate a variable name to a signal so I can use e.g. IF SIG(buffer.full) ?

- If buffer.full is to be mapped to a specific output, ie output number 20 - would be written as:
buffer.full = 20
SIG buffer.full; Turns on Output 20
- Outputs/Inputs are not mapped specifically to a signal, they are just mapped to real values.
- The command used, will then execute the real value in conjunction with the command.

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- Is it possible to use something like IFNOT ?

- Yes.
IF NOT SIG(buffer.full) THEN
xxxxxxx
END

I don't quite understand what you are trying to from your example, as it's written.

.PROGRAM main()
start:
BITS 289,16 = .height
BITS 290,16 = .width
BITS 291,16 = .rowcount
BITS 292,16 = .nwidth
IF SIG(launch) THEN
CALL prod(.height,.width,.rowcount,.nwidth)
END
GOTO start
.END

I'm assuming you wish to read 'words' (16 bits) based on signals coming into the Controller (inputs) and define local variables with the integer value - probably via a fieldbus protocol.
Then CALL a subroutine and parse in the received variables (BCD integer values from the incoming signals).
- defining is done from right side of '=' to the left.
- Also your BITS are referring to output signals not input signals and are overlapping too.

For example:
BITS 289,16 = .height
- Means, set Outputs (289 - 304) with the (BCD) integer value of .height
- .height needs to be defined with an integer value first.
- in its current condition, would produce an 'undefined variable' error.
BITS 290,16 = .width
- Means, set Outputs (290 - 305) with the (BCD) integer value of .width
- .width needs to be defined with an integer value first.
- in its current condition, would produce an 'undefined variable' error.

In this arrangement, your outputs (BITS) are overlapping also..........

So your program re-written to read incoming signals would be:

PROGRAM main()
start:
.height = BITS(1289,16)
.width = BITS(1305,16)
.rowcount = BITS(1321,16)
.nwidth = BITS(1337,16)
IF SIG(launch) THEN
CALL prod(.height,.width,.rowcount,.nwidth)
END
GOTO start
.END

- If using fieldbus protocol, obviously your signals need to mapped in the signal allocation aux function also.......

Hope this helps........................