Fieldbus coupler/controller |
• 55 |
Fieldbus controller 750-819 |
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3.2.9 LED display
The coupler possesses several LEDs for on site display of the controller operating status or the complete node.
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02 |
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A |
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C |
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C |
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A |
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SERVICE |
B |
D |
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STATUS |
24V |
0V |
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ICOM |
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I/O |
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USR |
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Fig. 3-14: Display elements 750-819 |
g081902x |
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A differentiation between two LED groups is made.
The first group = fieldbus contains the solid color LEDs having the designation SERVICE (green), STATUS (red) und ICOM (green) indicating the operating status of the communication via LON.
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 and software exception handling, i. e. the status of the fieldbus node.
The three-color USR-LED can be accessed by a user program in the programmable fieldbus controller.
LEDs located on the right-hand side in the coupler power supply section show the status of the supply voltage.
Modular I/O System
LONWORKS®
56 • Fieldbus coupler/controller Fieldbus controller 750-819
3.2.9.1 Blink code
Detailed fault messages are displayed with the aid of a blink code. A fault is cyclically displayed with up to 3 blink sequences.
•The first blink sequence (approx. 10 Hz) starts the fault display.
•The second blink sequence (approx. 1 Hz) following a pause. The number of blink pulses indicates the fault code.
•The third blink sequence (approx. 1 Hz) follows after a further pause. The number of blink pulses indicates the fault argument.
3.2.9.2Fieldbus status
The operating status of the communication via LON is signalled via the top LED group (SERVICE, STATUS and ICOM).
The SERVICE LED is directly connected to the Service Pin of the Neuron Chip and indicates the state of the Neuron-C application.
Given that the proper application of the controller is not processed in the Neuron Chip, but processing takes place inside the CPU via the IEC 61131-1 program, the application is performed internally within the controller. This is the case even for the states "Unconfigured", "Applicationless" and "Watchdog Timer" which are described below.
Indeed, no communication takes place over the LON network.
SERVICE- |
Meaning |
Trouble shooting |
LED |
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green |
Configuration successfully completed. |
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(lights up for |
Adress assigned and Neuron-C application is |
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half a second |
active. |
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and then |
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remains off) |
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green blinks |
No configuration, |
Press the Service-Pin of the coupler and check |
(1 second on, |
no addressing of the Network Management |
the Neuron-C application. |
1 second off) |
Tool (domain, subnet, node), Neuron-C |
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application is not activated yet. |
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green blinks |
No Neuron-C application loaded on the |
Load the Neuron-C application from your net- |
(1 second on, |
node. |
work management tool software into the node. |
2 seconds off |
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then remains |
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on) |
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green blinks |
Watchdog Timer, |
Check the Neuron-C application, if necessary |
cyclically |
Neuron-C application error |
restart the application. |
The STATUS LED indicates that a coupler is activated. This is the case when a wink task is sent and when the communication of both network manager and DPRAM interface fails.
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STATUS- |
Meaning |
Trouble shouting |
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LED |
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red blinks |
5 times within the WINK task |
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(0,5 Hz) |
(fault messages basically have a greater priority |
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than the WINK task. |
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red blinks |
DPRAM interface communication fault (has |
Reset fieldbus coupler hardware by switching off |
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(2 Hz) |
priority) |
the supply voltage of the coupler for about 3 |
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seconds. |
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Change the fieldbus coupler if necessary. |
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Modular I/O System
LONWORKS®
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Fieldbus coupler/controller • 57 |
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Fieldbus controller 750-819 |
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The ICOM-LED indicates a communication and data exchange between Neu- |
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ron® Chip and µC165. |
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ICOM-LED |
Meaning |
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Trouble shooting |
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green |
Data exchange |
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off |
No data exchange |
Check bus system integrity |
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3.2.9.3 Node status |
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LED |
Color |
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Meaning |
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IO |
red /green |
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The 'I/O' LED indicates the node operation and signals faults occur- |
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/ orange |
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ring. |
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The coupler starts after switching on the supply voltage. The "I/O" LED flashes red. Following an error free start up the "I/O" LED changes to green steady light.
In the case of a fault the "I/O" LED continues blinking red. The fault is cyclically displayed with the blink code.
Fig. 3-15: Signalling the LED's node status |
g012111e |
After overcoming a fault, restart the coupler by cycling the power.
Modular I/O System
LONWORKS®
58 • |
Fieldbus coupler/controller |
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Fieldbus controller 750-819 |
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I/O-LED |
Meaning |
Trouble shooting |
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green |
Data cycle on the internal bus |
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off |
No data cycle on the internal bus |
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red |
Coupler hardware defective |
Change the controller |
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red |
a) When starting: internal bus is initialized |
Evaluate the fault signal |
(fault code |
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blinks |
b) During operation: general internal bus fault |
and fault argument) |
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red |
Fault message during internal bus reset and |
Evaluate the fault signal |
(fault code |
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blinks cyclically |
internal fault. |
and fault argument) |
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Modular I/O System
LONWORKS®