Troubleshooting By Symptom - Mitsubishi Electric MELSEC iQ-F FX55-ASL-M User Manual

9.3

Troubleshooting by Symptom

This section describes troubleshooting method by symptom. If an error has occurred in the FX5-ASL-M, identify the error
cause with GX Works3. (Page 67 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 FX5-ASL-M on or off?
Are the number of transmission points of the FX5-ASL-M and the address
setting of the slave module correct?
Does the total length of the transmission cables (DP, DN) exceed 200 m?
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 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 24 V DC external power supply satisfy
the specifications?
Are two or more FX5-ASL-M modules connected within one AnyWireASLINK
line?
Are there AnyWireASLINK system master modules of different series
connected within one AnyWireASLINK line?
When data of the slave module cannot be checked
When I/O data and parameter data of the slave module cannot be checked, check the following.
Check item
Is the I/O information of the slave module stored in the following buffer
memory addresses in the program?
• 'Input information area' (Un\G0 to Un\G15)
• 'Output information area' (Un\G4096 to Un\G4111)
Are the I/O LEDs of the slave module normal?
Are two or more FX5-ASL-M modules connected within one AnyWireASLINK
line?
9 TROUBLESHOOTING
68
9.3 Troubleshooting by Symptom
Action
Perform the troubleshooting for when the LINK LED is on or off. (Page 65
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 FX5-ASL-M.
• Check that the ID of the slave module is not the same as the IDs of other
slave modules.
When the total length exceeds 200 m, adjust the total length within 200 m.
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 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 24 V DC external power supply within
the rated value (21.6 to 27.6 V DC). (The recommended voltage is 26.4 V
DC.)
Connect only one FX5-ASL-M module within one AnyWireASLINK line.
Connect only one AnyWireASLINK system master module within one
AnyWireASLINK line.
Action
Check that information regarding the slave module has been properly
assigned and that the instructions written in the program are free from
mistakes.
Check the I/O LED status of the slave module and check that there is no
disconnection, short circuit, or poor contact in the wiring on the load side.
Connect only one FX5-ASL-M module within one AnyWireASLINK line.