GE 345 Communications Manual

CHAPTER 1: COMMUNICATIONS GUIDE MODBUS FUNCTIONS
345 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE 1–173
The commands that can be performed by the 345 using function code 05 can also be
initiated by using function code 10.
Function Code 06H
Modbus Implementation: Preset Single Register
345 Implementation: Store Single Setpoint
This command allows the master to store a single setpoint into the memory of a 345 The
slave response to this function code is to echo the entire master transmission.
For example, request slave 17 to store the value 2 in setpoint address 04 5C. After the
transmission in this example is complete, setpoints address 04 5C will contain the value
01F4. The master/slave packet format is shown below:
Table 36: MASTER/SLAVE PACKET FORMAT FOR FUNCTION CODE 06H
Function Code 07H
Modbus Implementation: Read Exception Status
345 Implementation: Read Device Status
This is a function used to quickly read the status of a selected device. A short message
length allows for rapid reading of status. The status byte returned will have individual bits
set to 1 or 0 depending on the status of the slave device. For this example, consider the
following 345 general status byte:
Operation Code Description
1 Reset
4 Open
5 Close
96 Close Last Trip Data Prompt
97 Reset MWh and Mvarh Meters
99 Clear Counters
100 Clear Event Records
102 Clear Maintenance Info
MASTER TRANSMISSION BYTES EXAMPLE DESCRIPTION
SLAVE ADDRESS 1 11 message for slave 17
FUNCTION CODE 1 06 store single setpoint
DATA STARTING ADDRESS 2 04 5C setpoint address 04
5C
DATA 2 00 02 data for setpoint
address 04 5C
CRC 2 CB B9 CRC error code
SLAVE RESPONSE BYTES EXAMPLE DESCRIPTION
SLAVE ADDRESS 1 11 message from slave
17
FUNCTION CODE 1 06 store single setpoint
DATA STARTING ADDRESS 2 04 5C setpoint address 04
5C
DATA 2 00 02 data stored in
setpoint address 04
5C
CRC 2 CB B9 CRC error code

GE 345 Specifications

General

Brand	GE
Model	345
Category	Relays
Language	English