
B-62924EN/04 MAINTENANCE 2.LCD-MOUNTED TYPE PROFIBUS FOR THE Series 16i/18i/21i
- 155 -
2.2 LED INDICATORS AND THEIR MEANINGS
The integral-type PROFIBUS interface board for the Series
16i/18i/21i comprises two boards. Each board uses separate LED
indicators.
2.2.1 LED Indicators of the DP-Master Function
Name Color Description
LED1 Green Indicates whether the CPU of this board has been
activated.
Lit if the CPU has been released from the reset state and
activated.
The LED does not go on when the power is turned on.
LED2 Green Indicates whether the current communication is normally
performed.
Lit if the current communication is normally performed.
Not lit if communication is not performed.
The LED does not go on when the power is turned on.
LEDB Red Indicates if a RAM parity error has occurred on this board.
Lit if a parity error has occurred.
The LED does not go on when the power is turned on.
Once lit, the LED continues illuminating until the power is
turned off.
LED1 LED2 LEDB