FX Series Programmable Controlers Applied Instructions 5
5-71
f) Because this instruction uses a series of
multiplexed signals it requires a certain amount of
‘hard wiring’ to operate. The example wiring
diagram to the right depicts the circuit used if the
previous example instruction was programmed. As
a general precaution to aid successful operation
diodes should be places after each input device
(see diagram opposite). These should have a
rating of 0.1A, 50V.
g) Example Operation
When output Y20 is ON only those inputs in the
first bank are read. These results are then stored;
in this example, auxiliary coils M30 to M37. The
second step involves Y20 going OFF and Y21
coming ON. This time only inputs in the second
bank are read. These results are stored in devices
M40 to M47. The last step of this example has Y21
going OFF and Y22 coming ON. This then allows all of the inputs in the third bank to be
read and stored in devices M50 to M57. The processing of this instruction example would
take 20 × 3 = 60msec.
X10X11 X12 X13 X14 X15 X16X1724V 0V S/S
Y22 Y23 Y24 Y25 Y26 Y27+V Y20 Y21
3.
2.
1.
0,1 A
50 V
Diode
Input
devices
Transistor output unit
(source)
Notice how the resulting matrix-table does not use any of the P8 and P9 bit devices when
state S or auxiliary M relays are used as the storage medium.
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