Checking The Network Status; Communication Test - Mitsubishi Electric MELSEC iQ-R Series User Manual

4.3

Checking the Network Status

Communication test

Performs the transmit test and receive test with the RJ71DN91 connected to another DeviceNet device using a DeviceNet
cable.
Set the different node address from the own node to the communication target.
Procedure
1.
Connect the terminating resistors to both ends of the DeviceNet cable.
2.
Connect RJ71DN91 and other DeviceNet device with the DeviceNet cable.
3.
Match the communication speed to other DeviceNet device and set the mode switch to A to C. (A: 125kbaud, B:
250kbaud, C: 500kbaud)
4.
Turn on the power for network and the power of other DeviceNet device.
5.
Reset or power off and on the CPU module to start the test.
Checking the status and result of communication test
■Status of the communication test
Check the status of the communication test with the LED indication of the module.
Test status
Test in progress
Completed successfully
Completed with an error
■Checking the result
Check the result with 'Hardware test result area' (Un\G1583) of the buffer memory.
Check the result of the communication test with 'Hardware test result area' (Un\G1583) of the buffer memory.
Error code for Description
communication
test
01H The same node address as the own node
is on the network.
02H A bus off occurs.
03H The power is not supplied to the network.
04H An error has occurred at transmit data.
05H An error has occurred at receiving data.
06H The test normally completes.
LED indication
The MS LED is flashing in green/red alternately. (Including when the mode backs to the online mode after the completion
of the auto configuration or saving data to flash ROM.)
The MS LED turns on in green.
The MS LED turns off and the ERR LED turns on.
Action
Set different node addresses to every node on the network.
• Set the same value to the communication speed of every node on the network.
• Check the status of the network comprehensively: if the terminating resistor comes off, if
the distance and wiring of the communication cable is correct, and others.
Check if the power is correctly wired and supplied to the network.
• Connect other nodes on the network.
• Set the same value to the communication speed of every node on the network.
• Check the status of the network comprehensively: if the terminating resistor comes off, if
the distance and wiring of the communication cable is correct, and others.
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4 TROUBLESHOOTING
4.3 Checking the Network Status
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