Panasonic FP Series PLC Programming Manual - CTi Automation

1.2.2 External Output Relays (Y)
1.2 Explanation of Relays
Function of external output relays (Y)
This relay outputs the program execution result of the programmable controller and
activates an external device (load) such as a solenoid, operating panel or intelligent
unit.
The on or off status of the external output relay is output as a control signal.
Program
Output relay
X R Y
R
Execution
CPU
Output
unit
output
External
devices
(load):
on
Usage restrictions
External output relays which are not actually allocated can be used in the same way as
internal relays. However, they cannot be specified as hold types.
When used as contacts, there are no restrictions on the number of times that can be
used.
As a rule, when specified as the output destination for operation results of OT and KP
instructions, use is limited to once in a program (to inhibit double output).
Note
You can permit duplicated use of an output by changing the
system register 20 setting. Even if the same relay is used as an
operand for instructions such as SET and RST, it is not regarded
as duplicated use of outputs.
Yn
Yn
Duplicated output
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