GE 90-30/20/Micro manual Word INT

4

Example:

In the following example, when enabling contact FST_SCN is set, the parameter blocks for the checksum task function are built. Later in the program when input %I0137 turns on, the number of words being checksummed is read from the PLC operating system. This number is increased by 16, with the results of the ADD_INT function being placed in the “hold new count for set” parameter. The second service request block requests the PLC to set the new word count.

		_____				_____
FST_SCN
——— ——— XOR_—————————————————MOVE_
		WORD				INT
%R0150 —I1			Q— %R0150 CONST —IN				Q— %R0152
					+00001 LEN
						00001
%R0150 —I2						_____
		_____
.
.
			_____		_____		_____
%I0137
——— —————— SVC_————————— ADD_————————————————— SVC_—
		REQ			INT		REQ
	CONST —FNC			%R0151 —I1		Q— %R0153 CONST —FNC
	00006						00006
	%R0150 —PARM				CONST —I2		%R0152 —PARM
		_____			+00016 _____		_____

The example parameter blocks are located at address %R0150. They have the following content:

0 = read current count

hold current count

1 = set current count

hold new count for set

%R0150

%R0151

%R0152

%R0153

4-144 Series 90-30/20/Micro Programmable Controllers Reference Manual–September 1998 GFK-0467K