Function Code 06H - GE 350 Communications Manual

FUNCTION CODE 06H

Function Code 06H
Function Code 07H
9–4
Modbus Implementation: Preset Single Register
350 Implementation: Store Single Setpoint
This command allows the master to store a single setpoint into the memory of a 350 . 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
0002. The master/slave packet format is shown below:
Table 9-4: MASTER/SLAVE PACKET FORMAT FOR FUNCTION CODE 06H
MASTER TRANSMISSION
SLAVE ADDRESS
FUNCTION CODE
DATA STARTING ADDRESS
DATA
CRC
SLAVE RESPONSE
SLAVE ADDRESS
FUNCTION CODE
DATA STARTING ADDRESS
DATA
CRC
Modbus Implementation: Read Exception Status
350 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 350 general status byte:
The master/slave packets have the following format:
Table 9-5: Function code 7 bitmask
Bit
0
1
2
3
4
BYTES EXAMPLE
1 11
1 06
2 04 5C
2 00 02
2 CB B9
BYTES EXAMPLE
1 11
1 06
2 04 5C
2 00 02
2 CB B9
Function
Alarm
Trip
Self Test
Breaker Connected
52a Contact
350 FEEDER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
CHAPTER 9: MODBUS FUNCTIONS
DESCRIPTION
message for slave 17
store single setpoint
setpoint address 04
5C
data for setpoint
address 04 5C
CRC error code
DESCRIPTION
message from slave
17
store single setpoint
setpoint address 04
5C
data stored in
setpoint address 04
5C
CRC error code