Mitsubishi Electric Q81BD-J61BT11 User Manual page 37

2 SYSTEM CONFIGURATION
2 - 3
(b) During momentary power failure of the remote I/O modules
When a momentary power failure occurs in the power being supplied to the
remote I/O modules (24 V DC), an erroneous input may occur.
[Cause for erroneous inputs due to a momentary power failure]
The remote I/O module hardware uses the power by internally converting
the module power (24 V DC) to 5 V DC.
When a momentary power failure occurs in a remote I/O module, the
following situation occurs:
(Time for the 5 V DC power in the remote I/O module to turn off)
Thus, an erroneous input occurs when a refresh is performed within the
time indicated by 1) in the figure below.
Remote I/O module
(module power supply and input
external supply power)
Remote I/O module
(internal 5 V DC)
Input (Xn)
REMARK
When supplying power from a single power source to multiple remote I/O modules,
select the proper type of cable and perform wiring by considering the voltage drop.
Connections can be established if the receiving port voltage at the remote I/O
module is within the specified range of the remote I/O module to be used.
Stabilized
power supply
(4) Access to slave station No.64
When the CC-Link Ver.2 board is used, transient transmission to slave station
No.64 is not allowed.
REMARK
(1) Access to slave station No.64 is not possible even from GX Developer, GX
Works2 or GOT on any other station.
(2) Cyclic transmission can be normally performed with slave station No.64.
> (Response time for input module on
1)
When the input external power supply turns off, the input (Xn) turns off
after the response time for the input module changes from on to off.
Remote module
MELSEC
off)
Remote module
2 - 3