Troubleshooting By Symptom - Mitsubishi Electric MELSEC iQ-R AnyWireASLINK User Manual

4.3

Troubleshooting by Symptom

This section describes troubleshooting method by symptom. If an error has occurred in the RJ51AW12AL, identify the error
cause with an engineering tool. ( Page 75 Checking Module Status)
AnyWireASLINK transmission is not available
When AnyWireASLINK transmission is not available, check the following.
Check item
Is the LINK LED of the RJ51AW12AL on or off?
Are the number of transmission points of the RJ51AW12AL and the address
setting of the slave module correct?
Does the total wiring length of the transmission cables (DP, DN) exceed
200m?
Do the wires or cables used satisfy standards?
When communication is unstable
When communications are unstable, check the following.
Check item
Is the ambient temperature for the module within the specified range?
Is there any noise affecting the system?
Is the terminating unit connected properly?
Does the total wiring length of the transmission cables (DP, DN) exceed the
specified range?
Do the transmission cables (DP, DN) satisfy the specifications?
Does the power supply voltage of the 24VDC external power supply satisfy
the specifications?
Are two or more RJ51AW12AL modules connected within one
AnyWireASLINK line?
Are there AnyWireASLINK master modules of different series connected
within one AnyWireASLINK line?
Are the RJ51AW12AL module and AnyWireASLINK bridge module connected
within one AnyWireASLINK line?
Action
Perform the troubleshooting for when the LINK LED is on or off. ( Page 73
When the LINK LED turns on or off)
• Check that the address of the slave module is within the number of
transmission points of the RJ51AW12AL.
• Check that the ID or occupied address range of the slave module is not the
same as that of other slave modules.
• When using word transmission, check that the setting items are correct.
• Check that the bit address is not mixed up with the word address.
Adjust the total wiring length within 200m.
When they do not satisfy the standards, change the wires or cables with the
ones that satisfy the standards.
Action
Keep the ambient temperature within the specified range by taking action
such as removing heat source.
Check the wiring condition.
Pay attention to the polarities of the terminating unit and connect it properly.
Adjust the total wiring length of the AnyWireASLINK system within the
specified range.
• Use transmission cables (DP, DN) that satisfy the specifications such as the
type and wire diameter, and tightening torque to the terminal block.
• Do not run multiple transmission cables (DP, DN) using a multicore cable.
Adjust the power supply voltage of the 24VDC external power supply within
the rated value (21.6 to 27.6VDC). (The recommended voltage is 26.4VDC.)
Connect only one RJ51AW12AL module within one AnyWireASLINK line.
Connect only one AnyWireASLINK master module within one
AnyWireASLINK line.
Connect only one RJ51AW12AL module or AnyWireASLINK bridge module
within one AnyWireASLINK line.
4.3 Troubleshooting by Symptom
4 TROUBLESHOOTING
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