GE 345 Communications Manual

1–24 345 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
RS485 INTERFACE CHAPTER 1: COMMUNICATIONS GUIDE
In the measurands configuration screen, with each selected measurement, a Factor and
an Offset must be configured.
• The Factor is a multiplier factor.
• The Offset is an offset factor to be applied to the relay measurement to make the final
measurement calculation to be sent to the master
The factor and offset parameters allow the user to perform different scaling in the relay
measurements. The final measurement sent to the IEC103 master will be: “a*x+b”, where
“x” is the relay measurement, “a” is the multiplier factor and “b” is the offset.
The measurands will be sent to the primary station as a response to a class 2 request.
There is a Timeout configurable with increments of 100 ms, between 0 and 60 min, in order
to configure the desired interval.
Commands
All the commands and virtual inputs are available to be mapped using the EnerVista Setup
program. It is possible to choose the desired command for the ON state and the same or
different command for the OFF state.
The user is able to select the Information Number <1..255> and the Function Type <0..255>
command mappings, but the Identification Type 20 (General Commands) is fixed.++ There
are 32 configurable commands.
In this case it will be necessary to define a new format.
For example, FC500:
Modbus Address Description Value Format
44384 First ASDU Identification Type 3 or 9 F1
44385 First ASDU Function Type <0 – 255 > F1
44386 First ASDU Information Number < 0 – 255 > F1
44387 First ASDU Scan Timeout < 0 – 1000> secs F1
44388 First ASDU First Analog Entry Vab F1
44389 First ASDU First Analog Factor 1 F3
44390 First ASDU First Analog Offset 0 F1
44391 First ASDU Second Analog Entry Ib F1
44392 First ASDU Second Analog Factor 1 F3
44393 First ASDU Second Analog Offset 0 F1
... ... ... ...
44412 First ASDU Ninth Analog Entry Ib F1
44413 First ASDU Ninth Analog Factor 1 F3
... ... ... ...
44443 Second ASDU Ninth Analogue Entry
44444 Second ASDU Ninth Analogue Factor
44445 Second ASDU Ninth Analogue Offset
... ... ... ...
44446 Third ASDU Identification Type
... … ... ...
44476 Third ASDU Ninth Analogue Offset

GE 345 Specifications

General

Brand	GE
Model	345
Category	Relays
Language	English