7: B
ASIC
I
NSTRUCTIONS
FC5A M
ICRO
S
MART
U
SER
’
S
M
ANUAL
FC9Y-B1268
7-21
DC= and DC
≥
(Data Register Comparison)
The DC= instruction is an equivalent comparison instruction for data register values. This instruction will constantly com-
pare data register values to the value that has been programmed in. When the data register value equals the given value,
the desired output will be initiated.
The DC
instruction is an equal to or greater than comparison instruction for data register values. This instruction will
constantly compare data register values to the value that has been programmed in. When the data register value is equal
to or greater than the given value, the desired output will be initiated.
When a data register comparison instruction is programmed, two addresses are required. The circuit for a data register
comparison instruction must be programmed in the following order: the DC= or DC
instruction, a data register number
D0 through D1999 (all CPU modules) or D2000 through D7999 and D10000 through D49999 (slim type CPU modules), fol-
lowed by a preset value to compare from 0 to 65535.
The preset value can be designated using a decimal constant or a data register D0 through D1999 (all CPU modules) or
D2000 through D7999 and D10000 through D49999 (slim type CPU modules). When a data register is used, the data of
the data register becomes the preset value.
For LC (Load Compare) instructions, see page 4-8 (Advanced Vol.).
Ladder Diagram (DC=)
Ladder Diagram (DC
)
Data register # to compare with
Preset value to compare
DC=
50
D2
DC>=
D15
D3
Instruction
Data
DC=
OUT
D2
50
Q0
Program List
Instruction
Data
DC>=
OUT
D3
D15
Q1
Program List
Q0
Q1
The DC= and DC
instructions can be used repeatedly for different preset values.
The comparison instructions also serve as an implicit LOD instruction.
The comparison instructions can be used with internal relays, which are ANDed or ORed at a separate program address.
Like the LOD instruction, the comparison instructions can be followed by the AND and OR instructions.
Ladder Diagram
Instruction
Data
DC=
OUT
LOD
AND
OUT
D5
10
M0
I0
M0
Q0
Program List
Ladder Diagram
Instruction
Data
DC=
AND
OUT
D5
10
I0
Q0
Program List
Instruction
Data
DC=
OR
OUT
D5
10
I0
Q0
Program List
Ladder Diagram
I0
I0
M0
DC=
10
D5
DC=
10
D5
I0
DC=
10
D5
M0
Q0
Q0
Q0
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