Omron CQM1H-CLK21 User Manual
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157
Checking Data Link Status
Section 5-4
When 8-bit Format is Specified (i.e., when using a C200HX/HG/HE, CVM1, CV-series, or CQM1H-series
PLC or when using a CS/CJ-series PLC with the data link status storage format specification in the DM
Parameter Area set to 8-bit format)
(See note 1.)
Note
1.
When the default setting is used for the data link status storage destination,
16 words are determined within the status area according to the unit num-
ber setting. When the 8-bit format is specified, therefore, the data that is
reflected will be limited to node addresses 1 to 32.
When data link status is required for node addresses 33 or larger, do not
use the default setting, i.e., specify the first word of the status storage area.
If this is done when an 8-bit format is specified, 31 words will be used as
the status storage area.
2.
Always 1 for the Controller Link Support Board.
3.
Always 0 for the Controller Link Support Board.
4.
Even if an offset error occurs, the data link will operate and the node will
participate in the data links. In the node where the offset error occurred,
however, all receive area words will be cleared to 0.
PLC status (See note 2.)
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 (See note 3.)
0: Normal
1: Error
Data link participation
0: Not in data link or data link inactive
1: In data link
Offset error (See note 4.)
0: Normal
1: Error
Error: Offset exceeds number of
send words.
Insufficient (short) receive
area (See note 5.)
0: Sufficient
1: Insufficient
Insufficient: Receive area is smaller than
send area. Excess data is truncated; other
data is received.
Remaining receive area
(See note 6.)
0: Not remaining
1: Remaining
Remaining: Receive area is larger than
send area. Data is received and remaining
words are cleared.
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
15
Node 1
Node 3
Node 5
Node 7
to
Node 29
Node 31
Node 33
Node 35
to
Node 55
Node 57
Node 59
Node 61
Node 2
Node 4
Node 6
Node 8
to
Node 30
Node 32
Node 34
Node 36
to
Node 56
Node 58
Node 60
Node 62
7
8
0
First status word + 0
First status word + 1
First status word + 2
First status word + 3
First status word + 14
First status word + 15
First status word + 16
First status word + 17
First status word + 27
First status word + 28
First status word + 29
First status word + 30