FX Series Programmable Controllers Basic Program Instructions 2
2-6
2.6 And, And Inverse
Pro
ram example:
Basic points to remember:
- Use the AND and ANI instructions for serial connection of contacts. As man
contacts as
required can be connected in series (see followin
point headed “Peripheral limitations”).
- The output processin
to a coil, throu
h a contact, after writin
the initial OUT instruction
is called a “follow-on” output (for an example see the pro
ram above; OUT Y4). Follow-
on outputs are permitted repeatedl
as lon
as the output order is correct.
Mnemonic Function Format Devices Program steps
AND
(AND)
Serial connection
of NO (normall
open) contacts
X, Y, M, S, T, C 1
ANI
(AND Inverse)
Serial connection
of NC (normall
closed) contacts
X, Y, M, S, T, C 1
X
X
Y
Y
X
M
T
Y
X2
Y3
AND
X0
X3
T1
ANI
AND
2
0
3
3
3
101
1
4
LD
AND
OUT
LD
ANI
OUT
OUT
AND
0
1
2
3
4
6
7
5
Y3
M101
Y4
Peripheral limitations:
• The PLC has no limit to the number of contacts connected in series or in parallel.
However, some pro
rammin
panels, screens and printers will not be able to displa
or print the pro
ram if it exceeds the limit of the hardware. It is preferable for each
line or run
of ladder pro
ram to contain up to a maximum of 10 contacts and 1 coil.
Also, keep the number of follow-on outputs to a maximum of 24.
