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MELSEC-F
TROUBLESHOOTING11
11 - 36
POINT
(1) When the Ethernet module is replaced due to an error, reboot the following
external devices and restart data communication:
(If the external device retains the Ethernet address, it may be impossible to
continue communication because when a module is replaced the Ethernet
address changes.)
In the same way, when the external device (personal computer, etc.) is
replaced, restart the Ethernet module.
• All external devices that communicated with the station whose Ethernet
module was replaced.
• All external devices that communicated with other station's PLC via a
station whose Ethernet module was replaced.
(2) When connecting a device to the Ethernet module, see the following sections
for the required devices and connection method:
Section 2.2: Devices Required for Network Configuration
Section 4.4: Connecting to the Network
(3) If the Ethernet module could not receive messages sent from external
devices frequently, check the values stored in the following buffer memory.
(a) Simultaneous transmission error detection count storage area (BFM#398
to 399) and Error/End code storage area for each error log block
(BFM#229...)
When the error detection count number is high or when the error code
C0C7
H has been stored, high load may be applied to the Ethernet
connection line to transfer data among connected devices.
To reduce the load to the Ethernet line, it is necessary to take corrective
measures such as dividing the network or reducing the data transmission
frequency.
Consult your network administrator and take appropriate measures.