Direct Connection To The Engineering Tool Is Not Possible - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

A message sent from the external device cannot be received frequently.
When the Ethernet-equipped module frequently fails to receive a message sent from the external device, check the following
items.
Check item
Are there many detected errors in 'Simultaneous transmission error detection
count (receive buffer full count)' (Un\G5022 to Un\G5023)?
Has a system error been stored in 'Latest error code' (Un\G100 to Un\G163
(Connection No.1 to No.64 latest error code))?
Has 1H been stored in 'State of receive buffer' (Un\G1900030)?
If the above action does not solve the problem, perform the module communication test to check for hardware failure. (
Page 284 Module communication test)
*1 The buffer memory address is for when the network type of the RJ71EN71 or the RnENCPU (network part) is set to "Ethernet" and the
P1 connector is used.
When using the P2 connector or the CPU module (built-in Ethernet port part), or setting the network type to "Q Compatible Ethernet",
refer to the following.
Page 336 Buffer Memory
*2 The module communication test cannot be performed for the CPU module (built-in Ethernet port part). Perform the troubleshooting of
the CPU module and check for hardware failure. ( MELSEC iQ-R CPU Module User's Manual (Startup))
*3 Availability for the buffer memory depends on the firmware version. ( Page 406 Added and Enhanced Functions)

Direct connection to the engineering tool is not possible.

When the direct connection to the engineering tool is not possible, check the following items.
Check item
Is the Ethernet-equipped module directly connected to the engineering tool
with a single cable?
Is "Disable Direct Connection with MELSOFT" under "Security" of "Application
Settings" is set to "Disable"?
Is the transfer setup setting of the engineering tool correct?
Does a timeout occur when connecting to the engineering tool?
Does the device (personal computer) to be connected support the direct
connection?
If the above action does not solve the problem, perform the module communication test to check for hardware failure. (
Page 284 Module communication test)
*1 The module communication test cannot be performed for the CPU module (built-in Ethernet port part). Perform the troubleshooting of
the CPU module and check for hardware failure. ( MELSEC iQ-R CPU Module User's Manual (Startup))
Action
If many errors are detected or a system error is stored, there may be a heavy
*1
load on the Ethernet line due to data sending and receiving between
connected devices.
• Taking action such as separating networks or decreasing the number of
*1
data sending reduces the load on the Ethernet line.
• Consult with the network manager and reduce the load on the Ethernet line.
*3
• Taking action such as separating networks or decreasing the number of
data sending reduces the load on the Ethernet line.
• When communications using the fixed buffer is used, check whether the
BUFRCV instruction is executed. ( Page 73 Receive procedure)
• To receive data at shorter intervals than the scan time of the CPU module
using the fixed buffer, add the normally closed contact for the completion
device of the BUFRCV instruction to the execution conditions of the
BUFRCV instruction. ( Page 92 Receiving side)
*2
Action
Directly connect the Ethernet-equipped module to the engineering tool with a
single cable.
If "Disable Direct Connection with MELSOFT" is set to "Disable", change the
setting to "Enable".
If the setting is incorrect, check the following items.
• Check that "Ethernet Board" is selected in "PC side I/F".
• Check that "Ethernet Port Direct Connection" is selected in the "PLC side I/
F Detailed Setting of PLC Module" window or "PLC side I/F Detailed Setting
of Ethernet Module" window of "PLC side I/F".
• When "PLC side I/F" is "Ethernet Module", check that "Other Station (Single
Network)" is selected for "Other Station Setting" and "Access to Ethernet
module set on PLC side I/F" is selected in the "Network Communication
Route Detailed Setting of Ethernet" window of "Network Communication
Route".
Increase the value for "Check at Communication Time" and "Retry Times" in
the "Other Station Detailed Settings" window of "Other Station Setting" of the
"Specify Connection Destination Connection" window and connect again.
If the device does not support the direct connection, connect a hub.
*1
3 TROUBLESHOOTING
3.4 Troubleshooting by Symptom
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