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FX Series Programmable Controllers Basic Program Instructions 2
2-11
2.11 Or Block
Program example:
Basic points to remember:
- An ORB instruction is an independent instruction and is not associated with an
y
device
number.
- Use the ORB instruction to connect multi-contact circuits (usuall
y
serial circuit blocks) to
the precedin
g
circuit in parallel. Serial circuit blocks are those in which more than one
contact connects in series or the ANB instruction is used.
- To declare the startin
g
point of the circuit block use a LD or LDI instruction. After
completin
g
the serial circuit block, connect it to the precedin
g
block in parallel usin
g
the
ORB instruction.
Mnemonic Function Format Devices Program steps
ORB
(OR Block)
Parallel connection
of multiple contact
circuits
N/A 1
X0 X1
X2 X3
ORB
X4 X5
ORB
LD
AND
LD
AND
ORB
ORB
LDI
AND
0
1
2
3
4
6
7
5
8 OUT
X
X
X
X
X
0
1
2
3
4
Y
X
5
6
LD
AND
LD
AND
LDI
ORB
AND
ORB
0
1
2
3
4
6
7
5
8 OUT
X
X
X
X
X
0
1
2
3
5
Y6
X4
Recommended sequential
programming method
Non-preferred batch
programming method
Y6
Batch processing limitations:
• When usin
g
ORB instructions in a batch, use no more than 8 LD and LDI instructions
in the definition of the pro
g
ram blocks (to be connected in parallel). I
g
norin
g
this will
result in a pro
g
ram error (see the ri
g
ht most pro
g
ram listin
g
).
Sequential processing limitations:
• There are no limitations to the number of parallel circuits when usin
g
an ORB
instruction in the sequential processin
g
confi
g
uration (see the left most pro
g
ram
listin
g
).