GE 90-30/20/Micro manual I2 %M0017 = 606Fh = %M0033 = 000Fh =, I2 %M0017 = %M0033

4

Example:

In the following example, after first scan, the MSKCMPW function block is executed. %M0001 through %M0016 is compared with %M0017 through %M0032. %M0033 through %M0048 contains the mask value. The value in %R0001 determines at which bit position the comparison starts within the two input strings. The contents of the above references before the function block is executed are as follows:

(I1 ) – %M0001 = 6C6Ch =

0	1	1	0	1	1	0	0	0	1	1	0	1	1	0	0
(I2) – %M0017 = 606Fh =
0	1	1	0	1	1	0	1	0	1	1	0	1	1	1	1
(M/Q) – %M0033 = 000Fh =
0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1

(BIT/BN) – %R0001 = 0 (MC) – %Q0001 = OFF

The contents of these references after the function block is executed are as follows:

(I1) – %M0001 =

0	1	1	0	1	1	0	0	0	1	1	0	1	1	0	0
(I2) – %M0017 =
0	1	1	0	1	1	0	1	0	1	1	0	1	1	1	1
(M/Q) – %M0033
0	0	0	0	0	0	0	1	0	0	0	0	1	1	1	1

(BIT/BN) – %R0001 = 8

(MC) – %Q0001 = ON

Ladder Diagram Representation

	_____
FST_SCN
—— ———MASK_
	COMP_
	WORD	%Q0001
%M0001 -I1 MC—————————————————————————————————————————————————————————————(S)-
	LEN
	00001
%M0017 -I2 Q- %M0033
%M0033 -M BN- %R0001
%R0001 -BIT
	_____

Notice that, in the example shown above, we used the FST_SCN contact to force one and only one execution; otherwise the masked compare would repeat, not necessarily delivering the desired results.

4-68 Series 90-30/20/Micro Programmable Controllers Reference Manual–September 1998 GFK-0467K