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FX Series Programmable Controllers Basic Program Instructions 2
2-7
2.7 Or, Or Inverse
Program 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
(normally open)
contacts
X, Y, M, S, T, C 1
ORI
(OR Inverse)
Parallel
connection of NC
(normally 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 programming panels, screens and printers will not be able to display
or print the program if it exceeds the limit of the hardware. It is preferable for each
line or rung of ladder program to contain up to a maximum of 10 contacts and 1 coil.
Also keep number of follow-on outputs to a maximum of 24.