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The Basic Instruction Set
Example of an ORI instruction
Ladder Diagram
X000
0
X001
In the example output Y0 is switched on when either input X0 is on or input X1 is off:
3.4.6
Instructions for connecting operation blocks
Instruction
ANB
ORB
Although ANB- and ORB are PLC instructions they are only displayed and entered as connect-
ing lines in the Ladder Diagram display. They are only shown as instructions in Instruction List
format, where you must enter them with their acronyms ANB and ORB.
Both instructions are entered without devices and can be used as often as you like in a pro-
gram. However, the maximum number of LD and LDI instructions is restricted to 8, which effec-
tively also limits the number of ORB or ANB instructions you can use before an output instruc-
tion to 8 as well.
3 – 12
Y000
ORI instruction
ON
(1)
X0
OFF
(0)
ON
(1)
X1
OFF
(0)
(1)
ON
Y0
(0)
OFF
Function
AND Block (serial connection of blocks of
parallel operations/circuits)
OR Block (parallel connection of blocks
of serial operations/circuits)
An Introduction to Programming
Instruction List
0
LD
X000
1
ORI
X001
2
OUT
Y000
t
Symbol
GX Works2 FX
MITSUBISHI ELECTRIC
F9
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