FATEK FBs-CB2 - Page 143

Basic Function Instruction
6-18
FUN 4
DIFU
DIFFERENTIAL UP
FUN 4
DIFU
Symbol
Operand
D: a specific coil number where the result of
the Differential Up operation is stored.
Y M SM S
Range
Ope-
rand
Y0
∣
Y255
M0
∣
M1911
M1912
∣
M2001
S0
∣
S999
D ○ ○ ○* ○
Description
● The DIFU instruction is used to output the up differentiation of a node status (status input to "TG↑") and
the pulse signal resulting from the status change at the rising 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 TU contact.
Example The results of the following two samples are exactly the same
Ladder Diagram Key Operations Mnemonic Codes
Example 1
X1
TG
4.
DIFU
Y 0
ORG
FUN
ORG
FUN
D：
X
4
Y
1
0
Example 2
Y0
X1
OUT
ORG
ORG TU
OUT
X
Y
1
0
X1
Y0
t
t : scan time