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MELSEC-
2 SYSTEM CONFIGURATION
(b) Instantaneous power failure of remote I/O module
When instantaneous power failure occurs in the power source (24V DC) for
the remote I/O module, incorrect data may be input.
1) Causes of incorrect input due to instantaneous power failure
The hardware of the remote I/O module converts the supplied power of
24V DC into 5V DC inside the module and uses it for its own operation.
When instantaneous power failure occurs in the remote I/O module,
the following,
(Time until 5V DC is turned OFF inside the remote I/O module)
>(Response time from ON to OFF of the input ), is established.
Therefore, when the devices are refreshed within the time shown as
(1), data will be incorrectly input. (Especially, when the input response
time is set to the high-speed response type)
Input (Xn)
Remote I/O module
(Inside 5V DC)
Remote I/O module
(Power for module and
external power supply for input)
1)
Externally powering off for
input, turns input (Xn) OFF
after response time from ON to
OFF of Input unit.
Externally powering off for
input, turns input (Xn) ON
after response time from OFF
to ON of input module.
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