Status LEDs
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Status LEDs The EZ204-DP expansion unit has two LEDs.
POW LED, Function
Figure 7: Function of the POW LED
LED continuously lit:
– Power supply present
– Communication with the basic unit aborted
LED flashing:
– Power supply present
– Communication with the basic unit correct
LED not lit:
– No power supply present
– Communication with the basic unit aborted
BUS LED, Function
Figure 8: Function of the BUS LED
LED continuously lit:
– PROFIBUS-DP communication correct
LED not lit:
– No PROFIBUS-DP communication present
b
c
a
b
a
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