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5 SEQUENCE INSTRUCTIONS
(2) ORB is used to perform parallel connections for ladder blocks with two or more contacts.
For ladder blocks with only one contact, use OR or ORI; there is no need for ORB in such
cases.
[Ladder Mode]
X0
X1
0
X2
X3
X4
(3) The ORB symbol is not the contact symbol, but rather is the connection symbol.
(4) When programming in the list mode, it is possible to use up to 15 ORB instructions
successively (16 blocks).
[Operation Errors]
(1) There are no operation errors associated with ANB or ORB instructions.
[Program Example]
(1) A program using ANB and ORB instructions
[Ladder Mode]
5 - 8
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[List Mode]
0
LD
X0
Y10
1
AND X1
2
LD
X2
3
AND X3
4
ORB
5
OR X4
6
OUT X10
[List Mode]
Steps
MELSEC-Q/QnA
Instruction
Device
5 - 8
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