Basic Function Instruction
6 - 19
FUN 5
DIFD
DIFFERENTIAL DOWN
FUN 5
DIFD
Symbol
Operand
N: a specific coil number where the result of
the Differential Down operation is stored.
Y M SM S
Range
Ope-
rand
Y0
∣
Y255
M0
∣
M1911
M1912
∣
M2001
S0
∣
S999
D ○ ○ ○* ○
Description
● The DIFD instruction is used to output the down differentiation of a node status (status input to "TG↓") and
the pulse signal resulting from the status change at the falling edge of the "TG↓" for one scan time is
stored to a coil specified by D.
● The functionality of this instruction can also be achieved by using a TD contact.
Example The results of the following two samples are exactly the same
Ladder Diagram Key Operations Mnemonic Codes
Example 1
Y 0
X1
TG
5.
DIFD
ORG
FUN
ORG X 1
FUN 5
D： Y 0
Example 2
Y0
X1
ORG
OUT
ORG TD X 1
OUT Y 0
X1
Y0
t : scan time
t
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