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104
Checking Data Link Status
Section 5-4
Note
1.
Always 1 for the Controller Link Support Board.
2.
Always 0 for the Controller Link Support Board.
3.
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.
4.
The following shows an example of an insufficient (short) receive area.
5.
The following shows an example of a remaining receive area.
Note
1.
A communications error will occur in a node that is not participating in the
network. When a communications error occurs, previous status is retained
for other nodes status.
2.
Only the PC status and the PC’s CPU Unit error status are refreshed for
nodes that are participating in the network, but not participating in the data
links.
PC status (see note 1.)
0: Inactive (user program not running)
1: Active (user program running)
Communications error (data link reception)
0: Normal
1: Error
PC's CPU Unit error (see note 2.)
0: Normal
1: Error
Data link participation
0: Not in data link or data link inactive
1: In data link
Offset error (see note 3.)
0: Normal
1: Error
Error: Offset exceeds number of
send words.
Insufficient (short) receive
area (see note 4.)
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 5.)
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
Node 9
Node 11
Node 13
Node 15
Node 17
Node 19
Node 21
Node 23
Node 25
Node 27
Node 29
Node 31
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
First status word + 0 to + 15
7
8
0
Send
area
Receive
area
Data indicated by
Send
area
Receive
area
Data indicated by
Sufficient
is received in
node 2.
Insufficient (short)
Data indicated by
cannot be received in node 2.
and the remaining data is truncated.
is received
Node 1
Node 2
Node 1
Node 2
Data indicated by
Send
area
Receive
area
Send
area
Receive
area
Data indicated by
No remaining
is received in
node 2.
is received in node 2 and the
remaining words are cleared.
Remaining
Node 1
Node 2
Node 1
Node 2
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