[MEQ]는 Masked Comparison for Equal 의 약어다
Source [B3:16]의 데이터에 Mask 데이터 Hex [00FF] 합성한 데이터를
Compare 데이터와 비교해서 같으면 [O:2/0] Coil On
다시 설명하면 아래와 같다.
SOURCE - [ 0 0 0 0 | 0 0 1 1 | 0 0 0 1 | 1 0 1 1 ]
MASK - [ 0 0 0 0 | 0 0 0 0 | 1 1 1 1 | 1 1 1 1 ]
COMPARE-[ 0 0 0 0 | 1 1 0 1 | 0 0 0 1 | 1 0 1 1 ]
[-원본글-]
The MEQ instruction is used to compare data at a souce address with data at a compare
address. Use of this instruction allows portions of the data to be masked by a separate word.
The symbol for the Masked Comparison for Equal Instruction command is illustrated above. The
MEQ command [MEQ] is placed on the left side of the rung to determine if a rung will be true or
false for an output command. There are three parameters to enter, Source, Mask, and Compare:
⊙ Source - the address of the value you want to compare.
⊙Mask - the address of the mask through which the instruction moves data. The mask
can be hexadecimal value.
⊙Compare - an integer value or the address of the reference.
If the 16 bits of data at the source address are equal to the 16 bits of data at the compare
address
(less masked bits), the instruction is true. The instruction becomes false as soon as it detects a
mismatch. Bits in the mask word mask data when reset; they pass data when set.
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