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CHAPTER 1: COMMUNICATIONS GUIDE
Digital states
Measurands
345 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
•
measurands
•
commands.
Digital states in the relay may be mapped using the EnerVista SR3 Setup program. By
default, states are mapped to information numbers proposed by the standard, but the
user may delete these mappings if desired.
All the mapped information will be sent as a response to a general interrogation like ASDU
1.
For the other states, the customer can assign:
1.
Information Number <1..255>
2.
Function Type <0..255>.
Settings
Digital Status
Point 1 Entry
Select entry from list
....
....
Point 64 Entry
Select entry from list
This means that for each digital point 3 settings are required.
Example:
Modbus Address
Description
43879
Point 1 Entry Digital Status
44223
Point 1 Entry Function Type
44224
Point 1 Entry Information Number
The "Point Entry Digital Status" reuses the DNP Binary Input 43029, 43030, ...
Some analog points are supported by the 345 relay, with compatible information number
that have been identified in the device profile.
For the other measurands, it is possible to use the EnerVista SR3 Setup to select the
desired point and assign the Identification Type (3 or 9), Function Type <0..255>, and
Information Number <1..255>.
If the user selects Identification Type 3 (ASDU 3) only four measurands are available for
configuration, but if Identification Type 9 (ASDU 9) is selected, up to nine measurands can
be sent in the IEC103 slave answer. For each measurand, all metering values that the 345
supports, are available in order to be mapped. There are 3 possible configurable ASDUS.
For example, eDataVab is the index in the Modbus Memory Map.
Information Number
Function Type
<0 – 255 >
<0 – 255 >
<0 – 255 >
<0 – 255 >
Value
0x8242 (Undercurrent Trip)
160
144
RS485 INTERFACE
Format
FC134
F1
F1
1–23
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