Iec 60870-5-104 - GE 845 Instruction Manual

CHAPTER 4: SETPOINTS
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IEC 60870-5-104

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845 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
7 Digital Counter 8
8 Digital Counter 9
9 Digital Counter 10
10 Digital Counter 11
11 Digital Counter 12
12 Digital Counter 13
13 Digital Counter 14
14 Digital Counter 15
15 Digital Counter 16
ANALOG INPUTS
It is important to note that 16-bit and 32-bit variations of analog inputs are transmitted
through DNP as signed numbers. Even for analog input points that are not valid as
negative values, the maximum positive representation is 32767 for 16-bit values and
2147483647 for 32-bit values. This is a DNP requirement. The deadbands for all Analog
Input points are in the same units as the Analog Input quantity. For example, an Analog
Input quantity measured in volts has a corresponding deadband in units of volts. Relay
settings are available to set default deadband values according to data type. Deadbands
for individual Analog Input Points can be set using DNP Object 34.
1. A default variation refers to the variation response when variation 0 is requested and/
or in class 0, 1, 2, or 3 scans. The default variations for object types 1, 2, 20, 21, 22, 23,
30, and 32 are selected via relay settings. This optimizes the class 0 poll data size.
2. For static (non-change-event) objects, qualifiers 17 or 28 are only responded when a
request is sent with qualifiers 17 or 28, respectively. Otherwise, static object requests
sent with qualifiers 00, 01, 06, 07, or 08, are responded with qualifiers 00 or 01 (for
change event objects, qualifiers 17 or 28 are always responded.
Cold restarts are implemented the same as warm restarts – the 845 is not restarted, but
the DNP process is restarted.
The IEC 60870-5-104 communications protocol is supported on Ethernet ports 4 and 5
only. Setting changes become active after rebooting.
In 845 both DNP and IEC104 protocol can work at the same time, but the user has to
consider that there is only one point map. So, the two protocols use the same data
mapping, i.e., same point index and same point source.
The 845 supports up to two IEC104 client connections simultaneously.
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