Diagnostics and Troubleshooting
MVI56-DNP
♦
ControlLogix Platform
User Manual
DNP 3.0 Server
Page 88 of 171
ProSoft Technology, Inc.
July 21, 2011
4.3
Error Status Table
The program maintains an error/status table. This table of data is transferred to
the ControlLogix processor automatically through Read Block 100. Ladder logic
should be programmed to accept this block of data and place it in the module’s
controller tag. You can use the error/status data to determine the "health" of the
module.
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.
