Introduction.

Workshop PG5
Resources
3. 3 SYMBOL EDITOR
Before we start programming we have to make a list of all the elements we are
planning to use (number of inputs and outputs, number of timers and so on).
All these elements have to be known by PG5. This is very helpful to find
elements inside the program files, tell us we have committed a programming
error, or help during the debugging process. Therefore we list all the elements
we are going to use in a central tool called “Symbol Editor”.
We use the expression Symbol rather than element because we want to emphasize
that each element has a name (a symbol). Also, giving all your resources
a name makes it easier to read the program.
Elements of a
resource:
Name of the resource:
(can be up to 80
characters long)
Type of the symbol:
Here you specify what
kind of resource you
are using. For example
Input or Register….
Comment:
ADD a long comment
to every resource.
It makes the
program easier to
read.
Filename where
your symbols belong
too. The symbols
are not known
to files other then
this one.
Address/Value:
You have to tell the PG which input or
output you want to assign to this Symbol.
In the case of internal resources (everything
but inputs and outputs) you don’t
have to specify an address. The system
will choose one for you. This is called
auto allocation.
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