ProSoft Technology MVI69-DNP - Manual (Page 95)

Reference MVI69-DNP ♦ CompactLogix or MicroLogix Platform
DNP 3.0 Master/Slave Communication Module
ProSoft Technology, Inc. Page 95 of 129
November 3, 2008
5.4 Error Status Table
The program maintains an error status table. You can use the error/status data to
determine the "health" of the module.
The data in the block is structured as follows:
Word Block
Offset Variable Name Description
0 2 Current DNP Slave Port
status This value represents the current value of the
error code for the port. This value will only be
valid if the port is configured as a slave. The
possible values are described in the application
documentation.
1 3 DNP Slave Port last
transmitted error code This value represents the last error code
transmitted to the master by this slave port.
2 4 DNP Slave Port total
number of message
frames received by slave This value represents the total number of
message frames that have matched this slaves
address on this port. This count includes
message frames which the slave may or may
not be able to parse and respond.
3 5 DNP Slave Port total
number of response
message frames sent
from slave This value represents the number of good (non-
error) responses that the slave has sent to the
master on this port. The presumption is that if
the slave is responding, the message was
good. Note: This is a frame count.
4 6 DNP Slave Port total
number of message
frames seen by slave This value represents the total number of
message frames received by the slave,
regardless of the slave address.
5 7 DNP Slave
synchronization error
count (Physical Layer
Error) This value counts the number of times a sync
error occurs. The error occurs when extra bytes
are received before the start bytes (0x05 and
0x64) are received.
6 8 DNP Slave overrun error
count (Physical Layer
Error) This value counts the number of times the
overrun error occurs. This error occurs when
the mainline Data Link Layer routine cannot
read the data received on the communication
port before it is overwritten.
7 9 DNP Slave length error
count (Physical Layer
Error) This value counts the number of times an
invalid length byte is received. If the length of
the message does not match the length value
in the message, this error occurs.
8 10 DNP Slave bad CRC
error (Data Link Layer
Error)
This value counts the number of times a bad
CRC value is received in a message.
9 11 DNP Slave user data
overflow error (Transport
Layer Error)
This value counts the number of times the
application layer receives a message fragment
buffer which is too small.
10 12 DNP Slave sequence
error (Transport Layer
Error) This value counts the number of times the
sequence numbers of multi-frame request
fragments do not increment correctly.
11 13 DNP Slave address error
(Transport Layer Error) This value counts the number of times the
source addresses contained in a multi-frame
request fragments do not match.