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7. Basic Commands
ORB
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{ ORB ... Parallel connection of blocks
Usable device
Bit device Word device
Con-
stant
Pointer
X Y M L F BSB T SM VTCDRWSWZSDKH P
Digit
desig-
nation
Index
No. of
steps
1
ORB
OR or ORI is used for
the one contact
parallel connection.
A block
B block
Function
(1) OR operation of the A block and B block is executed, and the operation results are obtained.
(2) ORB connects circuit blocks with two or more contacts in parallel. Use OR or ORI to connect
circuit blocks with only one contact in parallel.
Coding
No. of
steps
Com-
mand
Device
10 LD X0
11 AND X1
12 LD X2
13 AND X3
14 ORB
15 ORI X4
16 OUT Y10
X2
X1X0
Y10
10
X4
X3
17
(3) The ORB symbol is a connection symbol instead of a contact symbol.
(4) When consecutively writing ORB, a max. of 7 commands (8 blocks) can be written. The PLC
cannot execute a correct operation if 8 or more commands are written consecutively.