Fbd_Mask_Equal Structure; Entering An Immediate Mask Value - Allen-Bradley Logix5000 Reference Manual

Input Parameter Data Type
EnableIn BOOL
Source DINT
Mask DINT
Compare DINT
Output Parameter Data Type
EnableOut BOOL
Dest BOOL
Description:
Compare Instructions (CMP, EQU, GEQ, GRT, LEQ, LES, LIM, MEQ, NEQ)

FBD_MASK_EQUAL Structure

Description
If cleared, the instruction does not execute and outputs are not updated.
If set, the instruction executes as described under Execution.
Default is set.
Value to test against Compare.
Valid = any integer
Defines which bits to block (mask).
Valid = any integer
Compare value.
Valid = any integer
Description
The instruction produced a valid result.
Result of the instruction. This is equivalent to rung-condition-out for the relay ladder
MEQ instruction.
A '1' in the mask means the data bit is passed. A '0' in the mask means the data bit
is blocked. Typically, the Source, Mask, and Compare values are all the same data
type.
If you mix integer data types, the instruction fills the upper bits of the smaller
integer data types with 0s so that they are the same size as the largest data type.

Entering an Immediate Mask Value

When you enter a mask, the programming software defaults to decimal values. If
you want to enter a mask by using another format, precede the value with the
correct prefix.
Prefix
16#
8#
2#
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Description
Hexadecimal
For example; 16#0F0F
Octal
For example; 8#16
Binary
For example; 2#00110011
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