Communication Status LEDs
The LED panel on the 171 CBU 78090 (M1) processor includes the following LEDs you can use to diagnose the state of communication over the 2 serial ports:
MB1 CH0 (yellow)
MB2 CH1 (yellow)
The LED panel on the 171 CBU 98090 (M1E) and 171 CBU 98091 (M1E-GD) processors includes the following LEDs you can use to diagnose the state of communication over the serial and Ethernet ports:
MB1 CH0 (yellow)
ETH STS (green)
ETH LNK/ACT (green)
ETH 100 (green)
Diagnosing Communication Status
The state of each of these LEDs describes the communication status for each processor, as follows:
LED |
Processor |
Flash Pattern |
Communication State |
|
|---|---|---|---|---|
M1 |
M1E & M1E-GD |
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MB1 CH0 |
X |
X |
flashing1 |
Data exchange (RX or TX) on the configurable RS232/RS485 serial port (channel 0) in progress. |
OFF |
No data exchange on the serial connection. |
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MB2 CH1 |
X |
flashing1 |
Data exchange (RX or TX) on fixed RS485 serial port (channel 1) in progress. |
|
OFF |
No data exchange on the serial connection. |
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ETH STS |
X |
ON |
Communication OK. |
|
2 flashes2 |
Invalid MAC address. |
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3 flashes2 |
Ethernet link not connected. |
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4 flashes2 |
Duplicate IP address. |
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5 flashes2 |
Waiting for served IP address. |
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6 flashes2 |
Operating using default IP address. |
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ETH LNK/ACT |
X |
ON |
Ethernet link detected; no communication activity. |
|
OFF |
No Ethernet link detected. |
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flashing |
Data exchange on the Ethernet link in progress. |
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ETH 100 |
X |
ON |
Ethernet transmission at 100 Mbits/s (fast Ethernet). |
|
OFF |
Ethernet transmission at 10 Mbits/s, or no Ethernet link detected. |
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1. ON for 200 ms, OFF for 200 ms, repeated continuously. 2. ON for 200 ms, OFF for 200 ms, repeated N times, followed by OFF for 1000 ms. |
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