G.9
Date Code 20170927 Instruction Manual SEL-751 Relay
IEC 60870-5-103 Communications
IEC 60870-5-103 in the SEL-751
IEC 60870-5-103 in the SEL-751
The IEC 60870-5-103 protocol settings in the SEL-751 contain five parame-
ters that must be set properly to get the most out of the protocol. These param-
eters are called 103ADDR, 103CYC, 103ACYC, 103ATRI, and 103TIME.
Table G.10 describes each of these parameters.
The IEC 60870-5-103 standard in the SEL-751 provides six category types
namely, Binary Inputs, Binary Targets, Binary Controls, Measurands, Fault
Analogs, and Meter Quantities. Each data point within each class type
requires an Information Number and a Function Type. Binary Inputs, Binary
Targets, and Binary Controls are defined within the map by a Label Name
followed by an Information Number followed by a Function Type.
Measurands, Fault Analogs, and Meter Quantities are defined within the map
by a Label Name followed by the Scale Factor/Nominal Value followed by the
Information Number followed by the Function Type. The Nominal Value
pertains only to Measurands and is defined within the following formula.
Consider for example frequency in the Measurand point (FREQ, 60, 0, 1).
Conceptually, when the frequency is 60 Hz, which is 0.4167 of 2.4 • Nominal
Value (2.4 • 60 = 144), then the value 0.4167 gets encoded as a 13-bit, fixed-
point number that has the same bit-wise representation as the integer that is
equal to the Value seen by Master or
Binary Inputs
In the SEL-751, binary data are reported as ASDU type 1 (Time Tagged
Message). Those points, monitored by the SER function of the device, have
their changes reported as COT type 1 (Spontaneous Events). The format of a
binary input point within the binary input map is “Label, [INF, FUN].” The
Label represents any valid binary input point accepted by the SEL-751. The
INF parameter is an integer in the range of 0 to 255. Similarly, the FUN
parameter is an integer in the range of 0 to 255. The Label can be entered by
itself with the SEL-751 choosing default parameters for INF and FUN. The
default parameter for INF is an available, unique value that is selected by the
SEL-751. The default parameter for FUN is 250.
Table G.10 SEL-751 IEC 60870-5-103 Port Settings
Parameter Description Range/Valid Input
103ADDR Link layer address of the product 0–254
103CYC Period at which to report cyclic data (measurands) 1–3600 seconds
103ACYC Meter quantity period to report type ASDU 205
data
OFF, 1–3600 seconds
103ATRI Relay Word bit used as a meter quantity reporting
trigger for type ASDU 205 data
1 Relay Word bit
103TIME Time synchronization enable Y, N
Value seen by Master
4096 Label_Value
2.4 Nominal_Value
---------------------------------------------------=
4096 FREQ
2.4 60 Hz
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