260
(5) Error log area (address: E0
H
to 1FF
H
)
The following table lists the details of the error log area. The buffer memory addresses of the error log block are
those of the error log block 1. For the addresses of the error log block 2 and later, refer to the list of buffer memory
addresses. ( Page 35, Section 3.5.2)
*1 The error information is continued to be stored into the following areas even if the count of the errors is stopped:
• Error log write pointer storage area
• Error log block
*2 An error log block area consists of 16 error log blocks that have the same data order.
Values stored in the buffer memory are cleared when an E71-connected station is powered on or reset. (They are not
cleared during the initial process.) Although this area does not normally need to be read, read it when necessary for
maintenance or other purposes.
Buffer memory
name
Address Description
Number of errors
E3
H
The number of errors registered in the error log block area is stored. When the number of
errors reaches 65536, the count stops at FFFF
H
(65535).
*1
Error log write pointer
E4
H
The number of the error log block where the latest error log is registered is stored.
• 0: No error (no registration of error log)
• 1 or more: The number of the error log block where the latest error log is registered.
If the pointer value is 16, it means that the latest error log is registered in the error log block
16 area. When the number of errors reaches 17, the error log is then registered in the error
log block 1 area again.
*2
Error log
block
Error
code/end
code
E5
H
An error code indicating error details is stored. The subheader code of the error message is
stored in bits 0 to 7 of the corresponding area. (Bits 8 to 15 store 0.) For errors below the
TCP/IP or UDP/IP level, 0 is stored.
Command
code
E7
H
The command code of the error message or the values of the lower bytes of the request type
and subrequest type of the data link instructions are stored.
0 is stored in the following cases:
• For messages not containing a command code
• For errors below the TCP/IP or UDP/IP level (because their commands are unknown)
Connection
No.
E8
H
The number of the error connection is stored in bits 0 to 7 of the corresponding area. (Bits 8
to 15 store 0.) For errors below the TCP/IP or UDP/IP level, 0 is stored.
Own station
port No.
E9
H
The port number of the error own station is stored. For errors below the TCP/IP or UDP/IP
level, 0 is stored.
Destination
IP address
EA
H
and EB
H
The IP address of the error connected device is stored. 0 is stored in the following cases:
• For errors below the IP level
• When an error response was sent through the CPU module
Destination
Port No.
EC
H
The IP address of the error connected device is stored. For errors below the TCP/IP or
UDP/IP level, 0 is stored.
Status for each protocol
178
H
to 1FF
H
The number of occurrences of the corresponding status of each protocol is stored. When the
count value by the E71 exceeds two words, the count stops at FFFFFFFF
H
(4294967295).
Subrequest type
b15 b8
to
Request type
b7 b0
to
Command code
b15 b0
to
or
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