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CHAPTER9 DEVICES
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9.2 Int
ernal User Devices
9.2.2 Output
(Y)
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 normally open or closed contacts
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.
(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).
Figure 9.6 Output from a CPU module to external devices
Figure 9.7 Output (Y) used in a program
Figure 9.8 Using as the internal relay
Signal lamp
Digital display
Contactor
Output (Y)
Sequence
operation
M51
Y22
Y21
Y20
Y20
X0
X1
Y20
Y20
X3
X2
No restrictions on the quantity used.
Programmable
logic cont
Out ladder (external device)
Program
Load
Input module
OUT Yn
Equivalent to
internal relay
