
B-62924EN/04 MAINTENANCE 1.PROFIBUS FOR THE Series 16/18-C
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1.2 LED INDICATORS AND THEIR MEANINGS
The PROFIBUS interface board for the Series 16/18-C has two
functions (DP-Master and DP-Slave functions). Each function uses
separate LED indicators.
1.2.1 DP-Master Function LED Indicators
Name Color Description
SYSFAIL Red Indicates the state of the SYSFAIL signal on the PROFIBUS
interface board. It is turned on when the power is switched on.
ALARM Red Software-controlled alarm LED. It is turned on when the power is
switched on. When the DP-Master function is started normally,
the LED is turned off and remains off thereafter.
P-WKR Red Turned on if an SRAM parity error occurs in the DP-Master.
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.
P-DPR Red Turned on if a DPRAM parity error occurs in the DP-Master.
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.
Name Color Description
TOKEN Green Indicates whether normal communication is performed.
Lit if normal communication is performed.
The LED does not go on when the power is turned on.
P-WKRSYSFAIL
LED1
P-DPR
LARM
LED2 TOKEN
During normal
operation
(communication)
When the power is
switched on
l: On
¡: Off