Fieldbus controller 750-842
•
87
LED Display
Modular I/O System
ETHERNET TCP/IP
3.2.8 LED
Display
The controller possesses several LED’s for on site display of the controller op-
erating status or the complete node.
24V 0V
+ +
01 02
ON
LINK
TxD/RxD
I/O
ETHERNET
C
D
B
A
ERROR
USR
status
voltage supply
-power jumper contacts
-system
Fig. 3-35: Display elements 750-842
g012902e
A differentiation between two LED groups is made.
The first group = fieldbus contains the solid color LEDs having the designa-
tion ON (green), LINK (green), TxD/RxD (green) and ERROR (red) indicat-
ing the operating status of the communication via ETHERNET.
The second group = internal bus consists of the three-color I/O LED
(red/green/orange). This LED is used to display the status of the internal bus,
i. e. the status of the fieldbus node.
The three-color USR-LED can be accessed by a user program in the program-
mable fieldbus controller.
LEDs located on the right-hand side in the coupler power supply section show
the status of the supply voltage.
3.2.8.1 Blink
code
A blink code displays detailed fault messages. A fault is cyclically displayed
using up to 3 different blink sequences.
•
The first blink sequence (approx. 10 Hz) indicates the fault display.
•
After a pause, a second blink sequence appears (approx. 1 Hz). The number
of blink impulses gives the fault code.
•
The third blink sequence (approx. 1 Hz) appears following a further pause.
The number of blink pulses indicates the fault argument (where the
faulty module is physically located on the node).