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FX Series Programmable Controllers Basic Program Instructions 2
2-7
2.7 Or, Or Inverse
Pro
g
ram example:
Basic points to remember:
- Use the OR and ORI instructions for parallel connection of contacts. To connect a block
that contains more than one contact connected in series to another circuit block in
parallel, use an ORB instruction.
- Connect one side of the OR/ORI instruction to the left hand bus bar.
Mnemonic Function Format Devices Program steps
OR
(OR)
Parallel
connection of NO
(normall
y
open)
contacts
X, Y, M, S, T, C 1
ORI
(OR Inverse)
Parallel
connection of NC
(normall
y
closed)
contacts
X, Y, M, S, T, C 1
X4
X6
M102
Y5
X7
X10
M103
M110
OR
ORI
LD
OR
ORI
OUT
LDI
ANI
AND
OR
0
1
2
3
4
6
7
5
8
9
OR
OUT
X
X
M
Y
Y
X
M
X
M
M
4
6
102
5
5
103
10
7
110
103
Y5
M103
Peripheral limitations:
• The PLC has no limit to the number of contacts connected in series or in parallel.
However, some pro
g
rammin
g
panels, screens and printers will not be able to displa
y
or print the pro
g
ram if it exceeds the limit of the hardware. It is preferable for each
line or run
g
of ladder pro
g
ram to contain up to a maximum of 10 contacts and 1 coil.
Also keep number of follow-on outputs to a maximum of 24.