Omron 3G8F7-CRM21, User Manual

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6
LED Indication Section 1-4
1-4 LED Indication
MS (Module Status) : To indicate the node status. (green and red)
NS (Network Status) : To indicate the communications status. (green and red)
Note The indicators flash in 0.5 second interval, i.e., they light for 0.5 second and
become unlit for another 0.5 second.
LED Name Indicating state Status Meaning
MS Green light Normal state The Master Board is in normal operation.
Green flash Stand-by It waits for a start-up by the application.
Red light Fatal error Master Board hardware error (including Watchdog Timer
(WDT) error)
Red flash Non-fatal error EEPROM read error or PC WDT error
Unlit Power-off or in
preparation One of the following applies:
Power is off.
The system is resetting or initializing.
NS Green light Online and in remote I/O
communications All of the followings apply:
⋅
Power is supplied. Remote I/O communications starts up.
⋅
None of the Slave and Repeater Units has
communications error.
⋅
No Registration Table error exists.
⋅
None of the Slave and Repeater Units has node address
duplication.
Green flash Online and in
preparation for remote
I/O communications It is before the remote I/O communications starts or during
communication. (In any state other than the communication
stop due to a communications error.)
Red light Fatal communication
related error The communications circuit has an error.
Red flash Non-fatal communication
related error One of the following applies:
⋅
One or more Slaves or Repeater Units has a
communications error.
⋅
One or more Slaves or Repeater Units has a Registration
Table error. That means a Slave Unit to participate is not
participating or a non-registered Slave Unit is
participating.
⋅
The communications stops due to a communications
error.
⋅
Illegal configuration error (an error of Repeater levels)
⋅
One or more Slaves or Repeater Units had node address
duplications.
Unlit Power-off or in
preparation One of the following applies: Power is off. The system is
resetting or initializing.