Basic Instructions; Comparison Operation Instructions - Mitsubishi Electric MELSEC-Q/L Programming Manual

6

BASIC INSTRUCTIONS

6.1

Comparison Operation Instructions

BIN 16-bit data comparisons
LD, AND, OR
High
Basic Process
Redundant Universal
performance
LD
AND
OR
(S1), (S2): Data for comparison or head number of the devices where the data for comparison is stored (BIN 16 bits)
Setting Internal device
data
Bit Word
(S1) 

(S2)
Processing details
• Treats BIN 16-bit data from device designated by (S1) and BIN 16-bit data from device designated by (S2) as a normally-
open contact, and performs comparison operation.
• The results of the comparison operations for the individual instructions are as follows:
Instruction symbol Condition
= (S1)=(S2)
<> (S1)(S2)
> (S1)>(S2)
<= (S1)(S2)
< (S1)<(S2)
>= (S1)(S2)
• When (S1) and (S2) are assigned by a hexadecimal constant and the numerical value (8 to F) whose most significant bit
(b15) is "1" is designated as a constant, the value is considered as a negative BIN value in comparison operation.
Operation error
• There is no operation error in the LD instruction, AND instruction, or OR instruction.
LCPU
indicates an instruction symbol of
Command
Command Command
R, ZR J\
Bit Word
Comparison Instruction symbol
operation result
Continuity =
<>
>
<=
<
>=
/
/
S1 S2
S1 S2
S1 S2
U\G Zn
Condition
(S1)(S2)
(S1)=(S2)
(S1)(S2)
(S1)>(S2)
(S1)(S2)
(S1)<(S2)
6 BASIC INSTRUCTIONS
6.1 Comparison Operation Instructions
/ .
/ /
Constant Others
K, H


Comparison
operation result
Non-continuity
187
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