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161
Checking Data Link Status
Section 5-4
5.
With CS/CJ-series PLCs, the status of the words from first status word +
16 to first status word + 30 when 8-bit format is specified and the status of
the words from first status word + 8 to first status word + 15 (i.e., the status
of nodes 33 to 62) is reflected when the Wired Network 62 Node Enable
Bit in the DM Parameter Area is turned ON.
The flags in the data link status operate as follows:
The Data Link Participation Flag and the PLC Status Flag can be used to see
if the system has started normally. These flags, however, cannot be used to
detect communications errors. Use the Communications Error Flag and PLC’s
CPU Unit Error Flag to detect errors.
If the Local Node Data Link Participation Flag is OFF, the previous status will
be maintained as the data link status and may not be correct. Make sure that
the Local Node Data Link Participation Flag is ON before checking data link
status.
Note
The following Local Node Data Link Participation Flags are available.
CS/CJ-series, CVM1, CV-series PLCs:
Bit 15 in 1500 + 25
×
unit 6
C200HX/HG/HE PLCs: SR 25205
CQM1H-series PLCs:
IR 9015
Name
Function
Data link participation The corresponding flag will turn ON if the node has never
participated in the data link normally. The flag will not turn
OFF once it has turned ON even if the node is no longer par-
ticipating in the data links.
Communications
error
The corresponding flag will turn ON if continuous data link
data cannot be received from the node, e.g., due to a cable
break. The flag will turn OFF again if normal data is received.
PLC’s CPU Unit error
The corresponding flag will turn ON if the CPU Unit has a
fatal error, non-fatal error, or watchdog timer error. The flag
will turn OFF again if the node returns to normal.
The status of this flag is based on data sent from the node
and will not turn ON if data cannot received, e.g., due to a
Communications Error. Make sure that the Communications
Error Flag is OFF before checking this flag.
PLC status
The corresponding flag will turn ON if the user program is
being executed in the CPU Unit. It will turn OFF is the user
program is not being executed.
The status of this flag is based on data sent from the node
and will not turn ON if data cannot received, e.g., due to a
Communications Error. Make sure that the Communications
Error Flag is OFF before checking this flag.
Содержание C200HW-CLK21
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Страница 12: ...xiii TABLE OF CONTENTS Index 367 Revision History 373 ...
Страница 13: ...xiv ...
Страница 19: ...xx ...
Страница 57: ...32 Application Precautions Section 1 5 Example CX Programmer Response Timeout Setting ...
Страница 69: ...44 Message Service Procedure Section 2 2 ...
Страница 111: ...86 Constructing Networks with Repeater Units Section 3 4 ...
Страница 154: ...129 Setting Data Links Section 5 2 Device Information Setting Data Link Tables ...
Страница 261: ...236 Response Codes Section 6 7 ...
Страница 297: ...272 Message Delay Times Section 8 4 ...
Страница 353: ...328 Handling Precautions Section 9 6 ...
Страница 364: ...339 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Страница 365: ...340 Changing the Data Link Tables with Active Data Links Section 10 2 ...
Страница 369: ...344 Standard Models Appendix A ...
Страница 391: ...366 Using the Relay Terminal Block Appendix C ...
Страница 397: ...372 Index ...
Страница 401: ...376 Revision History ...