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9.2.2 Output (Y)
(1) Definition
The output (Y) is used to output control results on programs to external devices such as signal lamps, digital
displays, electromagnetic switches (contactors), or solenoids.
Data can be output to the outside like using a normally open contact.
(2) Allowable number of
There are no restrictions on the number of normally open or closed contacts of Yn used in a program,
as long as the program capacity is not exceeded
Programmable
logic cont
X0
Y20
X1
Y20
(3) Using the output (Y) as the internal relay (M)
The output (Y) corresponding to the slots for input modules or empty slots can be utilized as the internal relay (M).
9 - 8
Sequence
operation
Figure 9.6 Output from a CPU module to external devices
normally open or closed contacts
No restrictions on the quantity used.
Y20
X2
X3
Program
Figure 9.7 Output (Y) used in a program
Input module
Figure 9.8 Using as the internal relay
Signal lamp
Digital display
Output (Y)
Contactor
.
Y20
Y21
Y22
OUT Yn
Equivalent to
internal relay
Load
M51
Out ladder (external device)
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