IMC: Compare input bits with the bits of a mask (S7-1500)

IMC: Compare input bits with the bits of a mask (S7-1500) - STEP 7

FBD (S7-1200, S7-1500)

ft:publication_title

FBD (S7-1200, S7-1500)

Product

STEP 7

Version

V20

Publication date

11/2024

Language

en-US

IMC: Compare input bits with the bits of a mask

Description

You can use the "Compare input bits with the bits of a mask" instruction to compare the signal state of up to 16 programmed input bits (IN_BIT0 to IN_BIT15) with the corresponding bits of a mask. Up to 16 steps with masks can be programmed. The value of the IN_BIT0 parameter is compared with the value of the mask CMP_VAL[x,0], with "x" indicating the step number. In the CMP_STEP parameter, you specify the step number of the mask that is used for the comparison. All programmed values are compared in the same manner. Unprogrammed input bits or unprogrammed bits of the mask have the default signal state FALSE.

If a match is found in the comparison, the signal state of the OUT parameter is set to "1". Otherwise the OUT parameter is set to "0".

If the value of the CMP_STEP parameter is greater than 15, the instruction is not executed. An error message is output at the ERR_CODE parameter.

Parameters

The following table shows the parameters of the "Compare input bits with the bits of a mask" instruction:

Parameter	Declaration	Data type	Memory area	Description
EN	Input	BOOL	I, Q, M, D, L, T, C or constant	Enable input
ENO	Output	BOOL	I, Q, M, D, L	Enable output
IN_BIT0	Input	BOOL	I, Q, M, D, L or constant	Input bit 0 is compared with bit 0 of the mask.
IN_BIT1	Input	BOOL	I, Q, M, D, L or constant	Input bit 1 is compared with bit 1 of the mask.
IN_BIT2	Input	BOOL	I, Q, M, D, L or constant	Input bit 2 is compared with bit 2 of the mask.
IN_BIT3	Input	BOOL	I, Q, M, D, L or constant	Input bit 3 is compared with bit 3 of the mask.
IN_BIT4	Input	BOOL	I, Q, M, D, L or constant	Input bit 4 is compared with bit 4 of the mask.
IN_BIT5	Input	BOOL	I, Q, M, D, L or constant	Input bit 5 is compared with bit 5 of the mask.
IN_BIT6	Input	BOOL	I, Q, M, D, L or constant	Input bit 6 is compared with bit 6 of the mask.
IN_BIT7	Input	BOOL	I, Q, M, D, L or constant	Input bit 7 is compared with bit 7 of the mask.
IN_BIT8	Input	BOOL	I, Q, M, D, L or constant	Input bit 8 is compared with bit 8 of the mask.
IN_BIT9	Input	BOOL	I, Q, M, D, L or constant	Input bit 9 is compared with bit 9 of the mask.
IN_BIT10	Input	BOOL	I, Q, M, D, L or constant	Input bit 10 is compared with bit 10 of the mask.
IN_BIT11	Input	BOOL	I, Q, M, D, L or constant	Input bit 11 is compared with bit 11 of the mask.
IN_BIT12	Input	BOOL	I, Q, M, D, L or constant	Input bit 12 is compared with bit 12 of the mask.
IN_BIT13	Input	BOOL	I, Q, M, D, L or constant	Input bit 13 is compared with bit 13 of the mask.
IN_BIT14	Input	BOOL	I, Q, M, D, L or constant	Input bit 14 is compared with bit 14 of the mask.
IN_BIT15	Input	BOOL	I, Q, M, D, L or constant	Input bit 15 is compared with bit 15 of the mask.
CMP_STEP	Input	BYTE	I, Q, M, D, L, P or constant	The step number of the mask used for the comparison.
OUT	Output	BOOL	I, Q, M, D, L	The signal state "1" indicates that a match was found. A signal state of "0" indicates that no match was found.
ERR_CODE	Output	WORD	I, Q, M, D, L, P	Error information
CMP_VAL	Static	ARRAY OF WORD	I, Q, M, D, L or constant	Comparison masks [0 to 15, 0 to 15]: The first number of the index is the step number and the second number is the bit number of the mask.

ERR_CODE parameter

The following table shows the meaning of the values of the ERR_CODE parameter:

Error code* (W#16#...)	Explanation
0000	No error
000A	The value at the CMP_STEP parameter is greater than 15.
*The error codes can be displayed as integer or hexadecimal value in the program editor. You can find information on switching the display formats under "See also".