96 • Fieldbus Controller 750-841
LED Display
3.1.8 LED Display
The controller has several LED’s for a visual display of the controller and nodes operating status.
ETHERNET 01 |
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ETHERNET 01 |
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LINK |
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C |
LINK |
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C |
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C |
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MS |
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MS |
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D |
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NS |
24V |
0V |
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NS |
24V |
0V |
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TxD/RxD |
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TxD/RxD |
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I/O |
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I/O |
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USR |
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USR |
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Fig. 3-14: Display elements 750-841 |
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g084102x |
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The LEDs can be divided into three groups.
The first group of LEDs display the status of the Ethernet fieldbus. It contains both solid and two-color LEDs. They are labelled as: ‘LINK‘ (green), ‘MS‘ (red/green), ‘NS‘ (red/green), and ‘TxD/RxD‘ (green).
The second group of LEDs are three-color LEDs (red/green/orange). One of the LED is labelled ‘I/O’, and displays the status of the internal bus. The other is labelled ‘USR’, and is programmable with WAGO-I/O-PRO CAA.
The third group uses solid colored LEDs. They are located on the right-hand side of the controller power supply. These display the status of the supply voltage.
3.1.8.1 Blink code
When the PFC is in a faulted, the ‘I/O’ LED is used to signal the fault type through a series of flashes (i.e., blink code). The blink code is cyclically displayed using 3 different blink sequences.
•The first blink sequence (approx. 10 flashes/second) indicates the start of a new sequence.
•After a pause, a second blink sequence starts (approx. 1 flash/second). Count the number of flashes to determine the fault code (e.g., 3 flashes equals Fault Code 3).
•The third blink sequence (approx. 1 flash/second) starts following a another pause. Count the number of flashes to determine the fault argument.
WAGO-I/O-SYSTEM 750 ETHERNET TCP/IP
Fieldbus Controller 750-841 • 97
LED Display
3.1.8.2 Fieldbus status
The health of the ETHERNET Fieldbus is signalled through the top LED group (‘LINK‘, ‘MS‘, ‘NS‘ and ‘TxD/RxD‘). The two-colored LEDs ‘MS’ (module status) and ‘NS’ (network status) are solely used by the Ethernet/IP protocol. These two LEDs conform to the Ethernet/IP specifications.
LED |
Meaning |
Trouble shooting |
LINK |
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green |
Link to a physical network exists |
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OFF |
No link to a physical network |
Check the fieldbus connection. |
MS |
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red / green |
Self test |
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flashing |
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red |
The system indicates a not remediable error |
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red flashing |
The system indicates a remediable error |
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green |
The system is not yet configures |
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flashing |
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green |
Normal operation |
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OFF |
No system supply voltage |
Check the supply voltage (24V and 0V) |
NS |
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red / green |
Self test |
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flashing |
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red |
The system indicates a double IP-address in the |
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network |
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red flashing |
At least one connection announced a Timeout, |
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where the CONTROLLER functions as target. |
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green |
No connection |
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flashing |
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green |
At least one connection is developed (also |
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connection to the Message rout applies) |
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OFF |
Dem System ist keine IP-Adresse zugeordnet |
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oder es liegt keine Betriebsspannung an |
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TxD/RxD |
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green |
Data exchange via ETHERNET taking place |
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OFF |
No data exchange via ETHERNET |
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WAGO-I/O-SYSTEM 750 ETHERNET TCP/IP
98 • Fieldbus Controller 750-841
LED Display
3.1.8.3 Node status
The ‘I/O‘-LED displays the communication status of the internal bus. Additionally, this LED is used to display fault codes (blink codes) in the event of a system error.
LED |
Meaning |
Trouble shooting |
I/O |
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green |
Fieldbus controller operating perfectly |
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red |
a) During startup of fieldbus controller: |
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Internal bus being initialized, |
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Startup displayed by LED flashing fast for approx. |
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1-2 seconds |
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red |
b) After startup of fieldbus controller: |
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Errors, which occur, are indicated by three conse- |
Evaluate the fault message (fault code and |
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cutive flashing sequences. There is a short pause |
fault argument). |
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between each sequential. |
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During startup of the controller, the ‘I/O‘-LED blinks as the internal bus is intialized. The LED will turn solid green after a fault free start-up.
In the case of a fault, the ‘I/O‘-LED continues flashing and displays a blink code.
Switching on the power supply
Coupler/Controller starts up
“I/O”-LED is blinking
Test o.k.? |
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Yes |
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“I/O” LED |
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1st flash sequence |
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(Introduction of the |
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error indication) |
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1st break |
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“I/O” LED |
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2nd flash sequence |
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Error code |
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(Number of flash cycles) |
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2nd break |
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“I/O” LED |
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“I/O”-LED is shining |
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3rd flash sequence |
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Error argument |
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(Number of flash cycles) |
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ready for operation |
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Fig. 3-15: Signalling of the LED for indication of the node status |
g012911e |
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After resolving the fault condition, restart the controller by cycling the power.
WAGO-I/O-SYSTEM 750 ETHERNET TCP/IP
Fieldbus Controller 750-841 • 99
LED Display
3.1.8.4 Fault Message via Blink Code from the I/O-LED
Fault argument |
Fault description |
Fault code 1: Hardware and Configuration fault |
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1 |
Overflow of the internal buffer memory for the inline code |
2 |
Unknown data type |
3 |
Checksum error of the parameter data |
4 |
Acknowledge Fault when writing data in the EEPROM |
5 |
Fault when reading out data from the EEPROM |
6 |
Changed I/O module configuration determined after AUTORESET |
7 |
Firmware does not run on existing hardware |
8 |
Timeout when writing data in the EEPROM |
9 |
Bus Controller initialisation fault |
10 |
RTC-Powerfail |
11 |
Fault when reading out the time from the RTC |
12 |
Fault when writing the time in the RTC |
13 |
Error Clock-Interrupt |
Fault code 2: Fault in programmed configuration |
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1 |
Process image not actively when switching control or monitor mode |
2 |
Process image is too large for the existing buffer |
3 |
Fault when compiling the process image |
Fault code 3: Internal bus command fault |
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0 |
No fault argument is put out. |
Fault code 4: Internal bus data fault |
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0 |
Data fault on internal bus or |
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Internal bus interruption on controller |
n* (n>0) |
Internal bus interrupted after I/O module n |
Fault code 5: Fault during register communication |
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n* |
Internal bus fault during register communication after I/O module n |
Fault code 6: Fieldbus specific errors |
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1 |
Invalid MACID |
2 |
Ethernet Hardware initialization error |
3 |
TCP/IP initialization error |
4 |
Network configuration error (no IP Address) |
5 |
Application protocol initialization error |
6 |
Process image is too large |
7 |
Double IP address in network |
8 |
Error when building the process image |
Fault code 7: I/O module is not supported |
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n* |
I/O module at position n is not supported |
Fault code 8: not used |
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0 |
Fault code 8 is not used. |
Fault code 9: not used |
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0 |
Fault code 9 is not used. |
Fault code 10: PFC error |
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1 |
Error when implementing the PFC run time system |
2 |
Error when generating the PFC inline code |
3An IEC task exceeded the maximum running time or the sampling interval of the IEC task could not be kept (Watchdog)
* The number of blink pulses (n) indicates the position of the I/O module. I/O modules without data are not counted (i.e. supply modules without diagnostics).
Example for a fault message
Fault: The 13th I/O module has been removed
1.The "I/O" LED starts the fault display with the first blink sequence (approx. 10 flashes/second).
2.The second blink sequence (1 flash/second) follows the first pause. The "I/O" LED blinks four times and thus signals the fault code 4 (internal bus data fault).
3.The third blink sequence follows the second pause. The "I/O " LED blinks
twelve times. The fault argument 12 means that the internal bus is interrupted after the 12th I/O module.
WAGO-I/O-SYSTEM 750 ETHERNET TCP/IP