F64_BCMP

Comparison of data blocks

Compares the contents of data block specified by s2_Start with the contents of data block specified by s3_Start according to the contents specified by s1_Control if the trigger EN is in the ON-state.

Parameters

Input

s1_Control (WORD)

control code specifying byte positions and number of bytes to be compared

s2_Start (WORD, INT, UINT)

starting 16-bit area to be compared to s3_Start

s3_Start (WORD, INT, UINT)

starting 16-bit area to be compared to s2_Start

Remarks

Specifying the control code s1_Control

1

Number of bytes to be compared

range: 16#01–16#99 (BCD)

2

Starting byte position of data block specified by s2_Start

1: starting from higher byte

0: starting from lower byte

3

Starting byte position of data block specified by s3_Start

1: starting from higher byte

0: starting from lower byte

The compare operation result is stored in the special internal flag R900B. When s2_Start=s3_Start, the special internal flag is in the ON-state.

The flag sys_bIsEqual used for the compare instruction is renewed each time a compare instruction is executed. Therefore the program that uses R900B should be just after F64_BCMP .

The variables s1 and s2 have to be of the same data type.

Example

POU header

All input and output variables used for programming this function have been declared in the POU header. The same POU header is used for all programming languages.

	VAR
		start: BOOL:=FALSE;
			(*activates the function*)
		ControlCode: WORD:=16#1106;
			(*s2 starting from upper byte
s3 starting from upper byte
compare 6 bytes*)
		DataBlock1: ARRAY [0..5] OF INT:=[6(1234)];
		DataBlock2: ARRAY [0..5] OF INT:=[6(1234)];
		equal_block: BOOL:=FALSE;
	END_VAR

POU body

When the variable start is set to TRUE, the function is carried out.

LD body

BODY
    WORKSPACE
        NETWORK_LIST_TYPE := NWTYPELD ;
        ACTIVE_NETWORK := 0 ;
    END_WORKSPACE
    NET_WORK
        NETWORK_TYPE := NWTYPELD ;
        NETWORK_LABEL :=  ;
        NETWORK_TITLE :=  ;
        NETWORK_HEIGHT := 6 ;
        NETWORK_BODY
B(B_CONTACT,,start,4,1,6,3,);
B(B_F,F64_BCMP!,Instance,10,0,18,6,,?DEN?Ds1_Control?Ds2_Start?Ds3_Start?AENO);
B(B_VARIN,,ControlCode,8,2,10,4,);
B(B_VARIN,,DataBlock1[0],8,3,10,5,);
B(B_VARIN,,DataBlock2[0],8,4,10,6,);
L(1,2,4,2);
L(6,2,10,2);
L(1,0,1,6);
        END_NETWORK_BODY
    END_NET_WORK
END_BODY

ST body

IF start then
    F64_BCMP( s1_Control:= ControlCode,
         s2_Start:= DataBlock1[0],
         s3_Start:= DataBlock2[0]);
END_IF;

IL body

Modified on: 2019-01-24Feedback on this pagePanasonic hotline