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11 - 14
MELSEC-F
TROUBLESHOOTING11
11 - 14
(f) Error log block - Connection No. (starting from BFM#232)
1) The faulty connection No. is stored in bits 0 to 3 of the corresponding
area. ("0" is stored in bits 4 to 15).
2) For errors below the TCP and UDP levels, "0" is stored.
(g) Error log block - Local station Port No. (starting from BFM#233)
1) This block stores the local station's port No. when an error occurred.
2) "0" is stored for errors below the TCP and UDP levels.
(h) Error log block - Destination IP address (starting from BFM#234)
1) This block stores the IP address of an external device when an error
occurred.
2) "0" is stored in the following cases.
• For errors below the IP level
• When an error response was relayed through the PLC.
(i) Error log block - Destination Port No. (starting from BFM#236)
1) This block stores the external device's port No. when an error occurred.
2) "0" is stored for errors below the TCP and UDP levels.
(j) Status for each protocol (BFM#376 to 511)
1) This address stores the count of the occurrence for the applicable
contents of each protocol's condition.
(The value counted by the Ethernet module.)
2) When the count value exceeds two words, the count stops at
FFFFFFFF
H (4294967295).
POINT
Values stored in the buffer memory are cleared when the Ethernet module's local
station is powered on. (They are not cleared during the initial processing.)
Normally, it is not necessary to read this area; so, read it as needed during
maintenance.