GE 90-30/20/Micro manual Format of Program Function Blocks

2

For a coil, the reference represents a location in memory that is controlled by the flow of power into the coil. In this example, if power flows into the left side of the coil, reference %Q0004 is turned ON.

%Q0004

–( )–

The programming software and the Hand-Held Programmer both have a coil check function that checks for multiple uses of %Q or %M references with relay coils or outputs on functions.

Format of Program Function Blocks

Some functions are very simple, like the MCR function, which is shown with the abbreviated name of the function within brackets:

–[ MCR ]–

Other functions are more complex. They may have several places where you will enter information to be used by the function.

The generic function block illustrated below is multiplication (MUL); parameters vary with the type of function block. Its parts are typical of many program functions. The upper part of the function block shows the name of the function. It may also show a data type; in this case, signed integer.

	_________________
	_____			This is the function block name (MUL).
	MUL		—
	———————————————
???????—I1		Q—???????
???????—I2
	_____
	_________________
	_____			This is the function block name (MUL)
				and data type (INT). INT (signed integer)
	MUL_—			represents the type and size of data to be
	INT			acted on.
	———————————————
???????—I1		Q—???????
???????—I2

_____

Many program functions allow you to select the data type for the function after selecting the function. For example, the data type for the MUL function could be changed to double precision signed integer. Additional information on data types is provided earlier in this chapter.

GFK-0467K Chapter 2 System Operation 2-27