Performing Commands Using Function Code 10H - GE 345 Communications Manual

CHAPTER 1: COMMUNICATIONS GUIDE

Performing Commands Using Function Code 10H

345 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
Modbus Address Hex Address
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
Commands can be performed using function code 16 as well as function code 5. When
using FUNCTION CODE 16, the Command Function register must be written with a value of
5. The Command Operation register must be written with a valid command operation
number. The Command Data registers must be written with valid data; this is dependent
upon the command operation.
For example, consider a request for slave 17 to perform command operation 1 (RESET): The
master/slave packets have the following format:
Table 41: MASTER/SLAVE PACKET FORMAT FOR PERFORMING COMMANDS
MASTER TRANSMISSION
SLAVE ADDRESS
FUNCTION CODE
DATA STARTING ADDRESS
NUMBER OF SETPOINTS
BYTE COUNT
DATA 1
DATA 2
CRC
Description
Force Virtual Input 14 State
Force Virtual Input 15 State
Force Virtual Input 16 State
Force Virtual Input 17 State
Force Virtual Input 18 State
Force Virtual Input 19 State
Force Virtual Input 20 State
Force Virtual Input 21 State
Force Virtual Input 22 State
Force Virtual Input 23 State
Force Virtual Input 24 State
Force Virtual Input 25 State
Force Virtual Input 26 State
Force Virtual Input 27 State
Force Virtual Input 28 State
Force Virtual Input 29 State
Force Virtual Input 30 State
Force Virtual Input 31 State
Force Virtual Input 32 State
BYTES EXAMPLE
1 11
1 10
2 00 80
2 00 02
1 04
2 00 05
2 00 01
2 7E CE
MODBUS FUNCTIONS
DESCRIPTION
message for slave 17
store multiple
setpoints
setpoint address 00
80
2 setpoints = 4 bytes
total
4 bytes of data
data for address 00
80
data for address 00
81
CRC error code
1–177