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FX
-16LNK-M MELSEC-I/O LINK REMOTE I/O SYSTEM MASTER BLOCK
2N
Cautions on system configuration
Pay attention to the following points in the power supply wiring (system design) so that erroneous inputs to or
outputs from remote I/O units can be prevented.
1 ) Countermeasures against erroneous inputs or outputs occurred when the power is turned on or off
•
When the power is turned on
[Draft 1]Turn on at first the power of remote I/O units and the power of master blocks supplied from the
outside. Then, turn on the power of a basic PC unit.
[Draft 2]Turn on at the same time the power of remote I/O units, the power of master blocks supplied
from the outside and the power of a basic PC unit.
•
When the power is turned off
[Draft 1]Turn off at first the power of a basic PC unit. Then, turn off the power of remote I/O units and the
power of master blocks supplied from the outside.
[Draft 2]Turn off at the same time the power of a basic PC unit , the power of remote I/O units and the
power of master blocks supplied from the outside.
2 ) Countermeasures against erroneous inputs occurred when the power of a remote I/O unit is instanta-
neously interrupted
If the power of a remote I/O unit is instantaneously interrupted, erroneous inputs may occur.
•
Causes of erroneous inputs by instantaneous power interruption
The hardware of a remote I/O unit converts the I/O unit power supply (24V DC) into 5V DC inside, then
uses it.
If the power of a remote I/O unit is instantaneously interrupted, the following relationship is generated.
(Time until 5V DC inside remote I/O unit is turned off) > (Response time of input unit ON → OFF)
Accordingly, if I/O refresh occurs within the time shown as
Connection and Wiring 3
➀
in the figure below, erroneous inputs occur.
3-2
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