Mitsubishi Electric MELDAS 60 Series Parameter Manual page 45

Note 2: RIO communication interrupt
If communication between the control unit and remote I/O unit fails, the alarm and remote I/O unit
number are displayed.
Z55 RIO NOT CONNECT
(a) and (b) above indicate the following matters.
This applies for both the remote I/O 1st system communication interrupted station and board connection
remote I/O communication interrupted station.
Note 3: System warning
Z57 SYSTEM WARNING
1. List of Alarms
1.5 System Alarms
(a)(b)
↓ ↓
Alarm RIO RIO RIO
number (seventh (sixth (fifth
station) station) station)
0
1
×
2
×
3
×
4
×
5
× ×
6
× ×
7
×
8
×
9
× ×
A
× ×
B
× ×
C
× ×
D
× × ×
E
× × ×
F
00xx 0000
↑
001x : When the expansion cassette (HR437) is not mounted, a program
memory capacity exceeding 1280m was designated.
002x : When the APLC open option was validated, 5120m was
designated
for the program memory capacity.
00x1 : After formatting the program memory capacity to 1280m or more,
the expansion cassette (HR437) was removed, or an expansion
cassette (HR437) not used during formatting was mounted.
Board connection remote I/O
communication interrupted station
0 0
Remote I/O 1st system communication
interrupted station
Remote I/O 2nd system communication
interrupted station
RIO Alarm RIO
(fourth number (third
station) station)
0
×
1
2
×
3
4
×
5
6
×
7
×
8
× ×
9
×
A
× ×
B
×
C
× ×
D
×
E
× ×
F
I - 31
RIO RIO RIO
(second (first (0th
station) station) station)
×
×
× ×
×
× ×
× ×
× × ×
×
×
× ×
×
× ×
× ×
× × ×