Omron DeviceNet 3G8F7-DRM21-E, Руководство по эксплуатации

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LED Indicators and Error Processing
Section 7-1
7-1 LED Indicators and Error Processing
The DeviceNet PCI Board have an MS (Module Status) indicator that indi-
cates the status of the Board itself and an NS (Network Status) indicator that
indicates the status of the Network. These indicators show when an error has
occurred and what type of error it is.
This section explains the meaning of the LED indicators and the processing
required when an error has occurred. This explanation assumes that the
Board has been installed and set up properly.
Indicator Status during
Normal Operation The following table shows the status of the MS and NS indicators during nor-
mal operation.
Indicator Status when an
Error has Occurred The following table shows the status of the MS and NS indicators when an
error has occurred and lists probable causes for the errors.
Indicator status Network/Board status Comments
MS NS
OFF OFF Waiting for initialization Boot program initialization processing is being executed.
Flashing
(green) OFF Waiting for start of scanner pro-
gram Scanner firmware initialization processing is being executed.
ON
(green) OFF MAC ID (node address) duplica-
tion check in progress Waiting for online request or the request has been received and
a node address duplication check is in progress between the
Board and other nodes in the network.
ON
(green) Flashing
(green) Remote I/O communications
stopped and message communi-
cations not established. Communications have not been established with other nodes
even though the Board is online.
With message communications, this indicates that the local
node has not sent a message to another node and that a mes-
sage has not been received from another node.
ON
(green) ON
(green) Remote I/O or message commu-
nications in progress. Indicates normal communications when remote I/O and/or mes-
sage communications are active.
Indicator status Error Probable cause and remedy
MS NS
Flashing
(red) No
change Hardware error
(EEPROM) An EEPROM error occurred.
Replace the Board.
Flashing
(red) OFF PC watchdog timer error The Board’s PC watchdog timer management function detected a
PC watchdog timer error. (The computer application has stopped.)
Restart the computer application or the computer itself.
ON
(red) OFF Hardware error
(Watchdog timer or RAM) One of the following hardware errors occurred:
• Board watchdog timer error
• RAM error
Replace the Board
No
change ON
(red) Node address duplication The Board’s node address has been set on another node.
Change the node address settings to eliminate the duplication.
Restart the computer or reset the Board.
Bus off detected Communications were stopped because a large number of data
errors occurred.
• Check the communications baud rate settings in all of the nodes.
• Check that the cable lengths (trunk and drop lines) are within
specifications.
• Check for loose or broken cables.
• Check that there are Terminating Resistors at each end of the
trunk line and nowhere else in the network.
• Check for excessive noise.