Cutler-Hammer D320 PLC, User Manual

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70
D320 PLC User's Manual
Comparison Instructions
Mnemonic Command Word Double Word Description
STR =
AND =
OR = START =
AND =
OR =
A
= B
D C
= D
On if A(C) value and B(D) value are
the same.
STR <>
AND <>
OR <> START <>
AND <>
OR <>
A
<> B
D C
<> D
On if A(C) value and B(D) value are
different. <> means the same as
≠ .
STR >
AND >
OR > START >
AND >
OR >
A
> B
D C
> D
On if A(C) value is greater than B(D)
value.
STR >=
AND >=
OR >= START >=
AND >=
OR >=
A
>= B
D C
>= D
On if A(C) value is greater than or
equal to B(D) value.
STR <=
AND <=
OR <= START <=
AND <=
OR <=
A
<= B
D C
<= D
On if A(C) value is less than or equal
to B(D) value.
STR <
AND <
OR < START <
AND <
OR <
A
< B
D C
< D
On if A(C) value is less than B(D)
value.
Substitution, Increment/Decrement Instructions
Note: Application instructions that operate on double words (32-bit) are designated with a “D” in
front of the single word instruction. For example, DINC refers to double word decimal
increment, DDEC refers to double word decimal decrement, etc.
Mnemonic Command Word Double Word Description
LET
(DLET) Let (Substitution)
LET
D =
S = DLET
D =
S =
Store value of designated register S
into D.
INC
(DINC) Decimal increment
INC
D = DINC
D =
D value increased by 1 whenever
input is On.
DEC
(DDEC) Decimal decrement
DEC
D = DDEC
D =
D value decreased by 1 whenever
input is On.
INCB
(DINCB) BCD increment
INCB
D = DINCB
D =
D value increased by 1 (BCD)
whenever input is On.
DECB
(DDECB) BCD decrement
DECB
D = DDECB
D =
D value decreased by 1 (BCD)
whenever input is On.