Notes On Configuring The System - Mitsubishi MELSEC-A AJ71PT3 User Manual

2. SYSTEM CONFIGURATION
2:5 Notes on Configuring the System
The following must be noted for the MINI link system to protect
remote 110 stations from input fault.
(1) For prevention of input fault at power-on and -off
(a) The master station must powered up after or simul-
taneously with remote 110 stations.
(b) The master station must powered down before or simul-
taneously with remote 110 stations.
REMARKS
I
The following power supplies are available for remote
110
stations. For further
information, see the MELSECNET/MINI Remote
110
User's Manual. .
(a)
110
unit power supply
····················Internally
converted to 5V DC and used in •
the internal circuit of the remote I/O
station.
(b) Input external supply
power···········
Power supply for the input remote I/O
unit only.
(c) Output external supply
power·········
Power supply for the output remote
110
unit only.
(2) For prevention of input fault due to instantaneous power
failure of remote 110 station
Input fault may be caused by instantaneous power failure
occurring at the remote 110 station power supply.
I
(a) Input fault caused by instantaneous power failure
The remote 110 hardware uses the I/O unit power supply of
5V DC converted by itself from 24V DC).
If instantaneous power failure occurs at the remote 110
station, the time elapsed until 5V DC in the remote 110 is
switched off) becomes greater than the input unit switch-
off response time. Hence, input fault occurs if liD refresh is
executed within the period of time indicated by @ below.
•
®
-=-
\
-
Input (Xn)
External supply 24V DC
(For liD unit power supply
and input external supply power)
Internal 5V DC
When the input external supply power is switched off,
input (Xn) is switched off after the input unit switch-off
response time has elapsed.
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