Function Code 05H - GE 350 Communications Manual

FUNCTION CODE 05H

Function Code 05H
8-4
Field Name
Slave Address
Function
Byte Count
Data Hi (Register 30305)
Data Lo (Register 30305)
Modbus Implementation: Force Single Coil
3 Series relay Implementation: Execute Operation
This function code allows the master to request a 3 Series relay to perform specific
command operations.
For example, to request slave 17 to execute operation code 1 (reset), we have the following
master/slave packet format:
Table 8-3: MASTER/SLAVE PACKET FORMAT FOR FUNCTION CODE 05H
MASTER TRANSMISSION
SLAVE ADDRESS
FUNCTION CODE
OPERATION CODE
CODE VALUE
CRC
SLAVE RESPONSE
SLAVE ADDRESS
FUNCTION CODE
OPERATION CODE
CODE VALUE
CRC
Forces a single coil (0X reference) to either ON or OFF.
The query message specifies the coil reference to be forced. Coils are addressed starting at
zero: coil 1 is addressed as 0.
The requested ON/OFF state is specified by a constant in the query data field.
A value of FF 00 hex requests the coil to be ON. A value of 00 00 requests it to be OFF. All
other values are illegal and will not affect the coil.
Force Virtual Inputs:
Description
Virtual Input 1
Virtual Input 2
Virtual Input 3
Virtual Input 4
Virtual Input 5
Hex
FE
04
02
80
80
BYTES EXAMPLE
1 11
1 05
2 00 01
2 FF 00
2 DF 6A
BYTES EXAMPLE
1 11
1 05
2 00 01
2 FF 00
2 DF 6A
Coil Address (HEX) Description
0x1000 Virtual Input 17
0x1001 Virtual Input 18
0x1002 Virtual Input 19
0x1003 Virtual Input 20
0x1004 Virtual Input 21
SR3 SERIES PROTECTIVE RELAY PLATFORM – COMMUNICATIONS GUIDE
CHAPTER 8: MODBUS FUNCTIONS
DESCRIPTION
message for slave 17
execute operation
operation code 1
perform function
CRC error code
DESCRIPTION
message from slave
17
execute operation
operation code 1
perform function
CRC error code
Coil Address (HEX)
0x1010
0x1011
0x1012
0x1013
0x1014