The E71 Frequently Fails To Receive A Message Sent From The Connected Device; A Dedicated Instruction Is Not Completed - Mitsubishi Electric QJ71E71-100 User Manual

16.5.2
The E71 frequently fails to receive a message sent from the
connected device.
The following table lists how to troubleshoot the problem when the E71 frequently fails to receive a message sent from
the connected device.
Check item
Are there many detected errors in Simultaneous
transmission error detection count (address: 18E
18F )?
H
Has the error code C0C7 been stored in Error code/end
H
code (address: E5 ) in the error log block?
H
Has 1 been stored in Receive buffer full detection signal
H
*1
(address: 5240 )?
H
Has the number in Received TCP packet count (address:
1B8 and 1B9 ) increased?
H H
*1 Available only for the QJ71E71-100.
Availability depends on the QJ71E71-100 version. (
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 (
16.5.3

A dedicated instruction is not completed.

The following table lists how to troubleshoot the problem when a dedicated instruction is not completed.
Check item
Is the network parameter mode set to "Online"?
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 (
288
There may be a heavy load on the Ethernet line due to data sending and
and
H
receiving between connected devices.
• Taking action such as separating networks or decreasing the number of data
sending reduces the load on the Ethernet line.
• Consult the network administrator and reduce the load on the Ethernet line.
• Taking action such as separating networks or decreasing the number of data
sending reduces the load on the Ethernet line.
• When communications using a fixed buffer is used, check whether the
BUFRCV instruction is executed. (
• To receive data at shorter intervals than the scan time of the CPU module
using a fixed buffer, add the normally closed contact for the completion
device of the BUFRCV instruction to the execution conditions of the
BUFRCV instruction. (
If the packets cannot be received even though the number of received TCP
packets has increased, set the value of TCP Maximum Segment Transmission
setting area (address: 1E
( Page 353, Appendix 4)
Page 374, Appendix 6.2)
Page 373, Appendix 6.1)
Set the network parameter mode to "Online".
( Page 83, Section 7.1.2)
(If a dedicated instruction is executed in the "Offline" mode, no error occurs but
the instruction is not completed.)
Page 374, Appendix 6.2)
Page 373, Appendix 6.1)
Action
Page 143, Section 12.4.1)
Page 172, Section 12.9.3 (2) (b))
) to 8000 . Then perform the initial process again.
H H
Page 350, Appendix 3)
Action