106
Checking Data Link Status
Section 5-4
Note N: Unit number
5-4-3
Checking by Manipulating Bit/Word Status
After you have confirmed that the data link function is operating normally,
check to see whether or not the data link is operating as intended, i.e., check
to see if the desired bits/words data is being transferred to the intended words
at other nodes.
Although the data link function itself may be operating correctly, the data link
areas may have been input incorrectly.
Change the contents of a bit or word in a data link send area using a Program-
ming Device or the user program and check whether the change is reflected in
data link areas of other nodes as intended.
Note Do not restart the polling node of the Controller Link Network while data links
are active. Otherwise, the data links may stop.
5-4-4
Error Detection Program Example
When the local node’s data link is participating, the AND condition of the data
link status for each node can be taken using the Data Link Participation Flag
and the Communications Error Flag, and the error output.
The following example shows an error output program for cases where the
local node data link stops.
The local node’s Communications Error Flag (in the data link status area) will
be turned ON if the local node is isolated from the network while the data link
is active. In this case, the data link remains active, so the node’s Data Link
Participation Flag will remain ON even though the node is isolated from the
network.
Manual
CS-series PLC
Specify in the data
link tables
16 words in the following
ranges
CIO:
0 to 6640
LR:
0 to 184
DM:
0 to 32752
EM:
0 to 32752
CIO 1500 + 25
×
N + 7 to 22
CVM1 or CV-
series PLC
16 or 31 words in the following
ranges
CIO:
0 to 2540
LR:
0 to 184
DM:
0 to 24560
EM:
0 to 32750
CIO 1500 + 25
×
N + 7 to 22
Data link
mode
PLC and
operating level
First data link
status word
Setting range
Default status
Local node
Data Link
Participation Flag
Node 1
Data Link Participating Flag
Node 1
Communications Error Flag
Node 1
Error output
Node 2
Error output
Node 32
Error output
Node 2
Data Link Participating Flag
Node 32
Data Link Participating Flag
Node 2
Communications Error Flag
Node 32
Communications Error Flag
Summary of Contents for CS1W-CLK12-V1
Page 3: ...iv ...
Page 5: ...vi ...
Page 9: ...x TABLE OF CONTENTS ...
Page 11: ...xii ...
Page 59: ...42 Component Names and Functions Section 3 1 Dimensions Unit mm ...
Page 62: ...45 Component Names and Functions Section 3 1 Dimensions Unit mm ...
Page 91: ...74 CVM1 and CV series Optical Ring Controller Link Units Section 4 2 ...
Page 108: ...91 Setting Data Links Section 5 2 Device Information Setting Data Link Tables ...
Page 125: ...108 Checking Data Link Status Section 5 4 ...
Page 181: ...164 Setting Routing Tables Section 7 4 ...
Page 199: ...182 Memory Areas Related to Duplex Operation Section 8 6 ...
Page 275: ...258 Handling Precautions Section 10 7 ...
Page 298: ...281 CS series Optical Bus Controller Link Units Appendix C Dimensions Unit mm 101 35 130 ...
Page 299: ...282 CS series Optical Bus Controller Link Units Appendix C ...