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3 Basic Program Instructions
This chapter introduces the basic instructions and their functions.
3-1
.
Basic Instructions List
XD, XL series support all the basic instructions:
Mnemonic Function
Format and Device
Chapt
er
LD
Initial logical operation
contact type NO
(normally open)
3-2
LDD
Read the status from the
contact directly
3-6
LDI
Initial logical operation
contact type NC
(normally closed)
3-2
LDDI
Read the normally closed
contact directly
3-6
LDP
Initial logical operation-
Rising edge pulse
3-5
LDF
Initial logical operation-
Falling /trailing edge
pulse
3-5
AND
Serial connection of NO
(normally open) contacts
M0
3-3
ANDD
Read the status from the
contact directly
3-6
ANI
Serial connection of NC
(normally closed)
contacts
M0
3-3
ANDDI
Read the normally closed
contact directly
3-6
ANDP
Serial connection of
rising edge pulse
3-5
ANDF
Serial connection of
falling/trailing edge
pulse
3-5
OR
Parallel connection of
NO (normally open)
contacts
3-4
ORD
Read the status from the
contact directly
X0
D
3-6
X
0
D
X
0
D
X
0
D
X
0
D
M0
M0
M0
M0
M0
M0
M0