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Status Area and Troubleshooting Section 9-2
Data Link Status: CIO 1500 + 25 × (Unit No.) + 7 to + 22
When the first data link status word is set to the default (0000) for either the
manually set data link tables or automatically set data link tables (In the first
data link status word parameter), the data link status is stored in the above
area (CIO 1500 + 25
× (Unit No.) (+ 7 to +22)).
When a different area has been set for the first data link status word, the sta-
tus is stored in the specified area. The status storage format is the same as
the one shown in the above diagram.
Note Refer to 5-4 Checking Data Link Status for details on status flags.
Bit Status and Error Processing
Data Link Status
Node 2
Node 4
Node 6
Node 8
Node 10
Node 12
Node 14
Node 16
Node 18
Node 20
Node 22
Node 24
Node 26
Node 28
Node 30
Node 32
PLC status
0: Inactive (user program not running)
1: Active (user program running)
Communications error (data link reception)
0: Normal
1: Error
PLC's CPU Unit error
0: Normal
1: Error
Data link participation
0: Not in data link or data link inactive
1: In data link
Offset error
0: Normal
1: Error
Error: Offset exceeds
number of send words.
Insufficient (short) receive area
0: Sufficient
1: Insufficient
Insufficient: Receive
area is smaller than
send area. Excess data
is truncated; other data
is received.
Remaining receive area
0: Not remaining
1: Remaining
Remaining: Receive
area is larger than send
area. Data is received
and remaining words
are cleared.
Node 1
Node 3
Node 5
Node 7
Node 9
Node 11
Node 13
Node 15
Node 17
Node 19
Node 21
Node 23
Node 25
Node 27
Node 29
Node 31
+7
+8
+9
+10
+11
+12
+13
+14
+15
+16
+17
+18
+19
+20
+21
+22
Bit status Probable cause Probable remedy
PLC’s CPU Unit error is 1:
ON
A fatal PLC error, non-fatal
PLC error, or a watchdog
timer error has occurred.
Refer to the PLC’s opera-
tion manual and correct
the error. If the error occurs
again, replace the PLC.
The Unit is mounted to a
non-compatible PLC.
Refer to 1-2-4 Controller
Link Unit Models and PLCs
and mount onto the correct
PLC.