| Page 40 of 51 |
|
|
Appendix A.18. Real Time Clock Synchronization
The FieldServer has a real time clock. ProtoCessors have a software clock. If using a ProtoCessor, it is advisable to update the clock on the device periodically.
Remote update of Real Time Clock – Server configuration
Regardless of the platform in use, it is possible to have the FieldServer set its clock using the DNP 3.0 protocol when the driver is configured as a Server. The following actions are required:
•Configure the driver to perform remote updates (Node parameter ‘Real_Time_Clock_Control’ =
•Set update frequency (Connection parameter ‘RTC_Update_Rqst_Interval’, default
•Have the Client send the time using Object 50 variation 1 (Time & Date CTO: Absolute Time) to the Server. When the Server receives this time it will store the value in a Data Array, as well as use it to update the real time clock.
Example
// | Server Side Connections |
|
| |
Ports |
|
|
| |
port | ,Baud | ,Protocol | ,RTC_Update_Rqst_Interval | |
P1 |
| ,2400 | ,DNP | ,123 |
|
|
|
|
|
// | Server Side Nodes |
|
|
|
Nodes |
|
|
| |
Node_Name | ,Node_ID | ,Protocol | ,Real_Time_Clock_Control | |
Node_A | ,11 | ,DNP | ||
|
|
|
|
|
Map_Descriptors |
|
|
|
|
|
|
|
|
Map_Descriptor_Name ,Data_Array_Name ,Data_Array_Offset | ,Function | ,Node_Name | ,Address | ,Length | ,dnpDataType | ,dnpDataVari | ||
Store_Time | ,DA_TIME | ,0 | ,Server | ,Node_A | ,0 | ,50 | ,50 | ,1 |
In this example, the Server has been configured to request a time update every 123 milliseconds and the request will be made by notifying the remote device that an update is required. The Server does this by setting a flag in the response internal indications bits. The default update is 2 seconds. If using the default, omit the specification of the ‘RTC_Update_Rqst_Interval’ parameter.
Remote update of Real Time Clock – Client configuration
If using the DNP 3.0 driver as a Client and you want to configure the driver to respond to Server requests for real time clock updates then:
•Create a Data Array named ‘DNP3_RTC_NODEx’ where x is the Server node station address. The format for the Data Array should be UINT32.
FieldServer Technologies 1991 Tarob Court Milpitas, California 95035 USA Web: www.fieldserver.com
Tel: (408) 262 2299 Fax: (408) 262 2269 Toll Free: (888) 509 1970 email: support@fieldserver.com
