Mitsubishi QJ71MT91 User Manual

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MELSEC-Q
11 TROUBLESHOOTING
Occurrence Error
Code
Error Name Description Lit LED Corrective Action
1) 2) 3) 4) 5)
7404H A receive error occurred.
COM.ERR.
• Check whether the operation
status of the target device is
normal or not.
• Check the line status for an
error.
• Hardware fault.
7405H
Receive error
The internal receive buffer has
no free space.
COM.ERR.
• Retry after a little while.
• Check whether the operation
status of the target device is
normal or not.
• Check the line status for an
error.
• Hardware fault.
7410H Send error A send error occurred.
COM.ERR.
• Check whether the operation
status of the target device is
normal or not.
• Check the line status for an
error.
• As the line may be busy, retry
after a little while.
• Hardware fault.
7420H
Broadcast
address
specification
error
The broadcast address was
specified in TCP-based
transmission.
COM.ERR.
Review the IP address setting of
the target device at the time of
transmission.
7421H
Ethernet
address error
The Ethernet address of the
target device is unknown.
COM.ERR.
• Review the IP address of the
target device at the time of
transmission.
• Check whether the target device
with the specified IP address
exists on the line or not.
• Check whether the operation
status of the target device is
normal or not.
• Check the line status for an
error.
• As the line may be busy, retry
after a little while.
• Replace the target device with
the one having the ARP
function.
7422H
IP check sum
error
A check sum error was
detected in the IP protocol.
COM.ERR.
• Check whether the operation
status of the target device is
normal or not.
• Check the line status for an
error.
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Mitsubishi QJ71MT91 Specifications

General

Brand	Mitsubishi
Model	QJ71MT91
Category	Controller
Language	English