182 Ethernet module User’s Manual
Chapter 8 Error Handling
8
8.1 LED Display
The EN311 indicates its module status in the RUN, STBY, ACC, and EXT.POWER
LEDs.
Table 8-1 lists the states indicated by the RUN and STBY LEDs. Note that the EN311
operating mode can be determined by the combination of the RUN and STBY LED
display states as listed in Table 8-2.
User programs should read out and verify the down information error codes listed in
Table 8-2 using the MREAD instruction issued for the down information in the S controller
interface buffer (see section 7.2, "Down Information").
Modules that fail (go to the down state) should be replaced.
Table 8-1 States Indicated by the RUN and STBY LEDs
LED display Description
RUN(Run) Indicates the module normal/error (down mode) status.
On Module normal
Off Module error (down)
STBY(Standby) Indicates the module operating mode when the module is operating
normally and an abbreviated error indication when the module is down.
On Standby (normal mode)
Off Run (normal mode)/Self-diagnostics error (down mode)
Blinking Module went down during operation (down mode)
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