ProSoft Technology MVI94-DNP - Manual (Page 86)

Reference MVI94-DNP ♦ Flex I/O
User Manual DNP 3.0 Server over Ethernet Communication Module
Page 86 of 131 ProSoft Technology, Inc.
December 17, 2010
When the module receives this block, it searches the slave list for the slave index
contained in the block. If the index is valid for the module, it constructs a
response block containing the status data for the indicated IED unit. The format
of the response block is shown in the following table.
Word Offset in
Block Data Field(s) Description
0 Block ID This field contains the value of 9949 identifying the block
type to the PLC.
1 Block ID This is the next block requested by the module.
2 Bad CRC This value represents the number of bad CRC values
received from the slave device.
3 Buff Ovrflw This value represents the number of buffer overflow
messages received from the slave device.
4 Tran Seq# This value represents the number of incorrect transport
layer sequence number errors.
5 Conf Retry This value represents the number of data link layer
confirm request retries.
6 Conf Fail This value represents the number of data link layer
confirm request failures.
7 No App Rsp This value represents the number of application layer no
responses to requests.
Ladder logic must handle this response block and to place the data in a user data
file.
Command List Error Data
This block is used by the processor to request the command list error data from
the module. The format of the block constructed by the processor is shown in the
following table.
Word Offset in
Block Data Field(s) Description
0 Block ID This field contains the value of 9950 identifying the block
type to the module.
1 Number of
Commands to report
This field contains the number of commands to report in
the response message. The value has a range of 1 to 4.
2 Start Index of First
Command
This parameter sets the index in the command list where
to start. The first command in the list has a value of 0.
The last index in the list has a value of MaxCommands -
1.
3 to 6 Spare Not Used