Mitsubishi Electric MELSEC-L Series - Communications Using SLMP Cannot be Performed; Communications Using the Predefined Protocol Cannot be Performed

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CHAPTER 16 TROUBLESHOOTING
16
16.6 Troubleshooting by Symptom 16.6.5 Communications using SLMP cannot be performed.
16.6.5 Communications using SLMP cannot be performed.
If communications cannot be performed with a connected device using SLMP, refer to the troubleshooting in the
following and take corrective action.
SLMP Reference Manual
16.6.6 Communications using the predefined protocol cannot be
performed.
The following table lists how to troubleshoot the problem when the E71 cannot perform communications using the
predefined protocol.
*1 For details on the settings, refer to Page 209, Section 15.7 (3).
If the action above does not solve the problem, perform the following tests on the E71 to check for hardware error.
• Hardware test ( Page 333, Appendix 6.2)
• Self-loopback test ( Page 332, Appendix 6.1)
Check item Action
Has the connection with the connected device been opened?
(Check the corresponding bit of 5000
H
in the buffer memory.)
• Open the connection with the connected device.
• Check if the open/close processes for I/O signals and the
OPEN/CLOSE instructions are not used together for the same
connection. If so, correct the program.
• Read Open error code (address: 7C
H
) in the communication status
storage area. Then check the error details and correct the error.
Is the IP address setting of the connected device correct? Check and correct the IP address of the connected device.
Does the Protocol in the open setting match with that of the
connected device (TCP/IP or UDP/IP)?
Check and correct the settings if they are unmatched.
Is "Predefined protocol" set to Fixed Buffer Communication in
the open setting?
• Set "Predefined protocol" to Fixed Buffer Communication in the open
setting.
• Configure the setting so that the fixed buffer setting (Send or Receive)
in the open setting matches the communication type of the protocol
(Send Only, Receive Only, or Send&Receive)
*1
.
Is Predefined protocol ready (X1D) on? Write the protocol setting data to the E71.
Was the ECPRTCL instruction executed? Correct the execution conditions of the ECPRTCL instruction.
Was the ECPRTCL instruction completed normally?
Check the error code in the ECPRTCL instruction completion status area
and correct the error.
Is the execution protocol number set to the control data of the
ECPRTCL instruction?
Set the execution protocol number to the control data of the ECPRTCL
instruction.
Is the communication status of the connected device normal? Correct the error in the connected device.
Has an open or initial error occurred in the error log area? Check and correct the error.