The Class 2 frame is selected with parameter Frame1InUse n. The user can select between the user-defined frame 0, standard frames 1 to 5, or IED-dependent frames 6 and 7. Selection of frames 0 to 7 is possible even if the IED does not produce all the values required by the mentioned Class 2 frames. Values that are not available in the IED is set to 0 in the selected Class 2 data frame.
Using of several Class 2 frames simultaneously
Using several Class 2 frames simultaneously is not a standard feature. However, it is possible to define that the IED sends more than one Class 2 frame to the master. Actually up to four Class 2 frames can be defined. The additional Class 2 frame selections is defined in setting parameters Frame2InUse n, Frame3InUse and Frame4InUse. For example, if Frame1InUse is set to "Private frame 6" and Frame2InUse is set to "User frame ", the IED gives out Class 2 "Private frame 6" and Class 2 "User frame" responses to every second Class 2 poll made by the master.