Communications Using Slmp Cannot Be Performed; Communications Using The Predefined Protocol Cannot Be Performed - Mitsubishi Electric MELSEC-L SERIES Basic User Manual

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.
Check item
Has the connection with the connected device been opened?
(Check the corresponding bit of 5000
Is the IP address setting of the connected device correct?
Does the Protocol in the open setting match with that of the
connected device (TCP/IP or UDP/IP)?
Is "Predefined protocol" set to Fixed Buffer Communication in
the open setting?
Is Predefined protocol ready (X1D) on?
Was the ECPRTCL instruction executed?
Was the ECPRTCL instruction completed normally?
Is the execution protocol number set to the control data of the
ECPRTCL instruction?
Is the communication status of the connected device normal?
Has an open or initial error occurred in the error log area?
*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 (
• Self-loopback test (
• 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
in the buffer memory.) connection. If so, correct the program.
H
• Read Open error code (address: 7C
storage area. Then check the error details and correct the error.
Check and correct the IP address of the connected device.
Check and correct the settings if they are unmatched.
• 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)
Write the protocol setting data to the E71.
Correct the execution conditions of the ECPRTCL instruction.
Check the error code in the ECPRTCL instruction completion status area
and correct the error.
Set the execution protocol number to the control data of the ECPRTCL
instruction.
Correct the error in the connected device.
Check and correct the error.
Page 333, Appendix 6.2)
Page 332, Appendix 6.1)
CHAPTER 16 TROUBLESHOOTING
Action
) in the communication status
H
*1
.
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