199
Troubleshooting
Section 7-2
Troubleshooting via
Indicators
There are indicators that display the Unit status of each MULTIPLE I/O TER-
MINAL Unit. The contents and causes of errors can be found by checking
these indicators.
Indicator Meanings
In addition to the above indicators, some Units also have indicators that dis-
play the I/O status.
Causes and Remedies for Communications Unit MS Indicator Errors
First use the Communications Unit MS indicator to check the status of the
Communications Unit, and then take action according to the following table.
Unit
Indicator
name
Meaning
Communications
Unit
NS
Displays the DeviceNet communications status.
MS
Displays the Communications Unit status.
TS
Displays the I/O Unit interface status.
Basic I/O Unit
TS
Displays the I/O Unit interface status.
Special I/O Unit
TS
Displays the I/O Unit interface status.
U.ERR
Displays the Special I/O Unit status.
PWR
Displays the operating power supply status.
No.
Communications
Unit MS indicator
status
Cause
Remedy
6
The power is not being supplied.
Check the operating power supply, and provide the cor-
rect power supply. If the problem persists, replace the
Communications Unit.
7
A hardware error has occurred in
the Communications Unit.
Restart the Communications Unit. If the problem per-
sists, replace the Communications Unit.
8
The DIP switch setting of the Com-
munications Unit is incorrect.
After checking the DIP switch setting (baud rate setting
pins 7, 8, or 9) and resetting it correctly, restart the
Communications Unit. If the problem persists, replace
the Communications Unit.
9
No error
Proceed to the next item, Causes and Remedies for
Communications Unit NS indicator Errors.
OFF
ON (red)
Flashing (red)
ON (green)
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Страница 13: ...xvi EC Directives 6 3 Keep DeviceNet communications cables as short as possible and ground to 100 Ω min ...
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