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FS-8700-47 DNP 3.0 Driver Manual Page 36 of 51
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Appendix A.10. Controlling the DNP 3.0 Driver’s Function Code
When a write Map Descriptor is found by the DNP 3.0 Driver it will use the DNP protocol’s write
function to write data to the DNP device. If the DNP device’s vendor requires that an alternative DNP
function be used, use the keyword dnpFunction in the Map Descriptor and specify the function that
the vendor requires (provided that it is in the list of functions implemented by this driver.)
Example: To set a Control Relay Output Descriptor’s state in a SEL-351A relay you cannot use a
write function. The vendor requires you use functions 3, 4, 5 or 6. Select the appropriate function and
specify it as the value of the dnpFunction parameter.
• In some cases the DNP 3.0 driver will change the default function automatically. This will be
reported in the error log.
• The dnpFunction parameters may have any legal DNP protocol function. The function must be
specified as a decimal value.
Function Value for
dnpFunction
Client Supports
Server Supports
Confirm 0 Yes Yes
Read 1 Yes Yes
Write 2 Yes Yes
Select 3 Yes
5
Yes
5
Operate 4
Yes
5
Yes
5
Direct Operate 5
Yes
5
Yes
5
Direct Operation with no Ack 6
Yes
5
Yes
5
Immediate freeze 7
Immediate freeze with no Ack 8 Limited*
Freeze Clear 9
Freeze Clear with no Ack 10 Limited*
Freeze Time 11
Freeze Time with No Ack 12
Cold Restart 13
Warm Restart 14
Delay Measurement 23 Yes Yes
When the Function #23 (Delay Measurement) is used the following two notes apply:
1. When the driver is configured as a Client, the configuration must also specify the dnpDataType
parameter set to Object 52 (Time Delay Objects) and the dnpDataVari parameter to variation 2
(Time Delay Fine ). The driver reads the single object from the Server. The address parameter is
ignored.
2. When the driver is configured to serve a response to a poll with application function #23 then the
configuration must have a Server Map Descriptor with dnpDataType parameter set to Object 52
(Time Delay Objects) and dnpDataVari parameter set to variation 2 (Time Delay Fine ). The
address parameter is ignored as the poll is for a single object. The driver responds by serving
data from the Data Array element specified on the Server Map Descriptor – most DNP 3.0 RTU
devices respond by reporting the number of milliseconds between receiving the 1
st
bit of the poll
and sending the 1
st
bit of the response.
5
There are limitations to the Select and Operate Functionality. Refer to Appendix A.19 for more
information.