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3.3.4 Measurands
Measurand object transmission is defined by the IEC 60870-5-103 standard. The
standard does not define any method for transporting integer values like counters or
enumeral objects.
Measurands are transmitted as a set of Class 2 data, referred to as a Class 2
measurands frame. According to the standard the coding of IEC 60870-5-103
measurand objects must be 13 bit signed values in the range of -1…+1.
When an IEC 60870-5-103 measurand, for example phase current, is scaled as 2.4,
it means that the measurand value 1 corresponds to 2.4*In, measurand value 0.5
corresponds to 1.2*In, and so on. If the measurand value in this case exceeds
2.4*In, the IEC 60870-5-103 object value saturates at its maximum value and an
overflow flag is set in the IEC 60870-5-103 object.
3.3.4.1 Class 2 measurands
The interchangeable part of the IEC 60870-5-103 standard defines that only five
Class 2 measurands frames exist. Measurands transmitted in these five Class 2
frames relates to current and voltage values only. Allowed scale factors, actually
meaning |max values| of per unit coded measurands, are 1.2 or 2.4. RE_615
supports all five interchangeable Class 2 measurand frames defined by the standard.
Table 6: Interchangeable Class 2 measurand frames
FrameNo ASDU
FUN 1)
INF Num of data Data in the Class 2 frame
1 3 0 144 1 IL2
2 3 0 145 2 IL2, U12
3 3 0 146 4 IL2, U12, P3, Q3
4 3 0 147 2 Io, Uo
5 9 0 148 9 IL1, IL2, IL3, UL1, UL2, UL3, P3,
Q3, pf
1) FUN = 0 means that the Function type is coded as the Device function type which in turn is defined
by the setting parameter Configuration/Communication/IEC 60870-5-103/DevFunType n.
3.3.4.2 Extended Class 2 measurand frames
IED-dependent frames 6 and 7
The IED also provides two private Class 2 frames that are IED type- and variant-
dependent. These Class 2 frames are in the IED referred to by frame numbers 6 and
7. These Class 2 frames contain most of the transferable measurands produced by
the IED in question. Frame 6 contains frequently changing updated values and
frame 7 adds more, less frequently updated values, to the contents of frame 6.
Section 3
1MRS756710 C
Vendor-specific implementation
18 615 series
Communication Protocol Manual