C37.118 Master | Connections

Once configured, the C37.118 master I/O interface offers different data points to be connected with the model.

The following data points can be connected to the model to provide the timestamp and additional information about the state of the synchronization:

Connection Point	Direction	Description
Phasors	From driver to model	For a given stream, each configured phasor will provide two connection points that will return data to the model. If the stream is configured in polar mode, connections points will be provided for the magnitude and the angle. If the stream is configured in rectangular mode, the connection points will be provided for the real and imaginary parts. The name of the connection point will contain the device name, and the configured phasor name.
Analogs	From driver to model	For a given stream, each configured analog value will provide two connection point that will return data to the model. The first one is the analog value itself, and the second one is the factor to be applied to this value. Since the standard does not specify how to handle factors for analog values, it is the user responsibility to either multiply or divide the analog value by the factor value returned to the model. The name of the connection point will contain the device name, and the configured analog point name.
Digitals	From driver to model	For a given stream, each configured digital value will provide 16 connection points that will return each bit of the 16-bit digital value to the model. The name of the connection point will contain the device name, the configured digital point name and the specific bit name.
Normal state status word	From driver to model	For a given digital value, normal status word of the current digital signal. The name of the connection point will contain the digital point name. Only available when ‘Enable reception of normal bit states’.
Frequency ROC	From driver to model	Rate of change of frequency sent by the PMU as per IEEE Std C37.118.2-2011 Section 4.3
Frequency	From driver to model	Frequency sent by the PMU as per IEEE Std C37.118.2-2011 Section 6.2.2.
Epoch time (sec)	From driver to model	Epoch time sent by the PMU as per IEEE Std C37.118.2-2011 Section 6.2.2.
Fraction of second (ns)	From driver to model	Fraction of second sent by the PMU as per IEEE Std C37.118.2-2011 Section 6.2.2.
Clock locked	From driver to model	Time quality as per IEEE Std C37.118.2-2011 Section 6.2.2.
Timebase	From model to driver	Resolution of fraction of second timestamp as per IEEE Std C37.118.2-2011 Section 6.4.

Some connection points can be used to monitor the status of the C37.118 master driver.

Connection Point	Direction	Description
Status	From driver to model	0 = Connected 1 = Disconnected 2 = Receiving 3 = Error
Error	From driver to model	0 = No error 1 = PMU unreachable 2 = Communication timeout 3 = Received PMU ID different than expected
Mismatch	From driver to mode	0 = No mismatch between the remote PMU and the PMU configured in the master 1 = There is a data mismatch between the remote PMU and the PMU configured in the master

Some connection points can be used to monitor the statistic word sent by the PMU. See Table 6, section 6.3 of IEEE Std C37.118.2-2011:

Connection Point	Direction	Description
Data error	From driver to model	00 = good measurement data, no errors 01 = PMU error. No information about data 10 = PMU in test mode (do not use values) or absent data tags have been inserted (do not use values) 11 = PMU error (do not use values)
In sync	From driver to model	PMU sync, 0 when in sync with a UTC traceable time source.
Data sorting	From driver to model	0 by time stamp, 1 by arrival.
Configuration change	From driver to model	Set to 1 for 1 min to advise configuration will change, and clear to 0 when change effected.
Data modified	From driver to model	1 if data modified by post processing, 0 otherwise
Time quality	From driver to model	See Table 7, section 6.3.1 of IEEE Std C37.118.2-2011.
Unlocked time	From driver to model	00 = sync locked or unlocked < 10 s (best quality) 01 = 10 s ≤ unlocked time < 100 s 10 = 100 s < unlock time ≤ 1000 s 11 = unlocked time > 1000 s
Trigger reason	From driver to model	1111–1000: Available for user definition 0111: Digital 0110: Reserved 0101: df/dt High 0100: Frequency high or low 0011: Phase angle diff 0010: Magnitude high 0001: Magnitude low 0000: Manual

Finally, there is only one connection point that can be used to send data from the model to the driver:

Connection Point	Direction	Description
Enable reception of data	From model to driver	This connection point is only available when the ‘Enable automatic data request’ is disabled. At the beginning of the simulation, the C37.118 master driver will ask and receive the PMU configuration, but will not ask to begin the data transfer. From the model, when the value associated to this connection point will change from 0 to 1, the C37.118 master will send a command to the PMU to start transmitting data. If this value change from 1 to 0, the C37.118 master will send a command to the PMU to stop data transmission.

Here is an example of how sensors can be configured to return C37.118 master information to the model.

Please note that unused columns have been collapsed.