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MVI56-DNP
♦
ControlLogix Platform
Reference
DNP 3.0 Server
User Manual
ProSoft Technology, Inc.
Page 121 of 171
July 21, 2011
Read Slave Communication Error Table Block (9949)
If the ControlLogix processor sends a block 9949, the module will respond with a
slave communication error listing. The module can be set up for 40 slaves on its
DNP Master port. A 10-word data area is established in the module for each
slave. This requires 400 words of data storage.
Value Description
Index
This value corresponds to the index in the device array for the slave.
Slave Addr
This value corresponds to the DNP slave address for the device.
Bad CRC
This value represents the number of bad CRC values received from the slave
device.
Buff Ovrflw
This value represents the number of buffer overflow messages received from the
slave device.
Tran Seq#
This value represents the number of incorrect transport layer sequence number
errors.
Conf Retry
This value represents the number of data link layer confirm request retries.
Conf Fail
This value represents the number of data link layer confirm request failures.
No App Rsp
This value represents the number of application layer no responses to requests.
Spare
Reserved for future use.
Spare
Reserved for future use.
These data values are updated after each command processed by the module.
The block 9949 request is structured to retrieve data for up to 30 slave units each
call. The format of the block sent from the ControlLogix processor 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 module.
1
Number of slaves
This field contains the number of slaves to report in the
response message. The value has a range of 1 to 30.
2
Start Slave Index
This parameter sets the index in the slave array where to
start. The first slave in the array has a value of 0. The last
index in the array has a value of MaxSlaves -1.
3 to 247
Spare
Not Used