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Checking Data Link Status Section 5-4
Issuing the FINS Command from CVM1, CV-series, CS/CJ-series, and CQM1H-series PLCs
Data links can be stopped by sending the FINS command “STOP.” The node
to which the FINS command is issued must be participating in the data link.
5-4 Checking Data Link Status
There are two methods for checking the status of active data links:
• Check the LED indicators on the front of the Units.
• Check the data link status area.
5-4-1 LED Indicators
Check the LINK and M/A indicators on the front of the unit.
The LNK indicator will be lit at all node participating in the data links as long
as operation is normal. The data link mode (manual/automatic) can be
checked using the M/A indicator. See 9-1 Troubleshooting Using Indicators for
details.
5-4-2 Data Link Status Area
The data link status area can be used to check for errors when data link does
not operate normally even though no abnormality has been detected by the
PLC’s CPU Unit or the Controller Link Unit. The data link status area contains
the data link status information shown below.
The number of words used for data link status and the information that is
reflected depends on the setting (8-bit or 4-bit format) for the data link status
storage format specification in the DM Parameters Area, as shown in the fol-
lowing diagram.
See 9-2 Status Area and Troubleshooting for troubleshooting procedures and
see
Data Link Status Storage Format (CS/CJ Series Only) for details on set-
ting the data link status storage format in the DM Parameters Area when
using CS- and CJ-series PLCs.
Node in data links
FINS command:
RUN/STOP
CVM1, CV,
CS/CJ, or
CQM1H
RUN
ERC
INS
SD
ERH
LNK
RD
TER
M/A
CLK21
C200HX/HG/HE PLCs CVM1 and CV-series PLCsCS-series PLCs CJ-series PLCs
CQM1H-series PLC
s
RUN
ERC
INS
SD
ERH
LNK
RD
TER
M/A
CLK21
CLK21-V1
RUN
CLK21-V1
ERC INS
ERH M/A LNK RDTER
SD
Make sure that the LNK
indicator is ON at nodes
participating in the active data
links.
Name Color Status Contents
LNK
(data link)
Yellow ON Participating in data links.
Flashing Data link table setting error
OFF Not in data links or data links are inactive.
M/A
(data link
mode)
Yellow ON Manual Note: This indicator will
always be OFF when the
data links are not active.
OFF Automatic