05: Execute Operation - GE 239 Instruction Manual

7 COMMUNICATIONS
Slave Response
SLAVE ADDRESS
FUNCTION CODE
BYTE COUNT
DATA 1
DATA 2
DATA 3
CRC
• Modbus Implementation:Force Single Coil
• 239 Implementation:
This function code allows the master to request a 239 to perform specific command operations. The
command numbers listed in the Commands area of the memory map correspond to operation code
for function code 05.
The operation commands can also be initiated by writing to the Commands area of the memory map
using function code 16. Refer to Section 7.14: 16: PERFORMING COMMANDS on page 7–10 for
complete details.
a) MESSAGE FORMAT AND EXAMPLE
Reset 239 (operation code 1).
Master Transmission
SLAVE ADDRESS
FUNCTION CODE
OPERATION CODE
CODE VALUE
CRC
Slave Response
SLAVE ADDRESS
FUNCTION CODE
OPERATION CODE
CODE VALUE
CRC
GE Multilin
Courtesy of NationalSwitchgear.com
Bytes
- 1 byte
- 1 byte
- 1 byte
- 2 byte
- 2 bytes
- 2 bytes
- 2 bytes
Execute Operation
Bytes
- 1 byte
- 1 byte
- 2 bytes
- 2 bytes
- 2 bytes
Bytes
- 1 byte
- 1 byte
- 2 bytes
- 2 bytes
- 2 bytes
239 Motor Protection Relay
7 COMMUNICATIONS
Example (hex)
11 message from slave 11
03 read registers
06 3 registers = 6 bytes
00 00 bit set corresponding to command 13
00 00 value in address 006C
00 00 value in address 006D
EC B5 CRC calculated by slave

7.9 05: EXECUTE OPERATION

Example (hex)
11 message for slave 11
05 execute operation
00 reset command (operation code 1)
01
FF perform function
00
DF CRC calculated by the master
6A
Example (hex)
11 message from slave 11
05 execute operation
00 reset command (operation code 1)
01
FF perform function
00
DF CRC calculated by slave
6A
7
7-5