
CHAPTER 8: COMMUNICATIONS
SUPPORTED MODBUS FUNCTIONS
MM3 MOTOR MANAGER 3 – INSTRUCTION MANUAL
8–7
The slave response to this function code is the slave address, function code, a count of the
data bytes to follow, the data itself and the CRC. Each data item is sent as a two byte
number with the high-order byte sent first.
For example, request slave 17 to respond with 1 register starting at address 0008. For this
example the value in this register (0008) is 0000.
8.2.5
Function Code
05h
Modbus implementation: Force single coil
MM3 Motor Manager 3 implementation: execute operation
This function code allows the master to request a MM3 Motor Manager 3 to perform
specific command operations. The commands supported by the MM3 Motor Manager 3
are listed in
Performing Commands using Function Code 10h
For example, to request slave 17 to execute operation code 1 (reset), we have the following
master/slave packet format:
The commands that can be performed by the MM3 Motor Manager 3 using function code
05 can also be initiated by using function code 10. See
on page 8–10 for
an example of performing commands using function code 10.
Master Transmission
Bytes
Example
Description
Slave address
1
11
message for slave 17
Function code
1
04
read registers
Data starting address
2
00 08
data starting at 0008h
Number of actual values
2
00 01
1 register = 2 bytes total
CRC
2
B2 98
computed CRC error code
Slave Response
Bytes
Example
Description
Slave address
1
11
message from slave 17
Function code
1
04
read registers
Byte count
1
02
1 register = 2 bytes
Data word (see definition above)
2
00 00
value in address 0008h
CRC (low, high)
2
78 F3
computed CRC error code
Master transmission
Bytes
Example
Description
Slave address
1
11
message for slave 17
Function code
1
05
execute operation
Operation code
2
00 01
operation code 1
Code value
2
FF 00
perform function
CRC
2
DF 6A
computed CRC error code
Slave response
Bytes
Example
Description
Slave address
1
11
message from slave 17
Function code
1
05
execute operation
Operation code
2
00 01
operation code 1
Code value
2
FF 00
perform function
CRC
2
DF 6A
computed CRC error code
Summary of Contents for MM3
Page 8: ...vi MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL TABLE OF CONTENTS ...
Page 18: ...1 10 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL TECHNICAL SPECIFICATIONS CHAPTER 1 INTRODUCTION ...
Page 80: ...4 18 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL CHASSIS MOUNT UNITS CHAPTER 4 SOFTWARE ...
Page 124: ...5 44 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL S7 TESTING CHAPTER 5 SETPOINTS ...
Page 198: ...8 54 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL MODBUS MEMORY MAP CHAPTER 8 COMMUNICATIONS ...
Page 220: ...10 14 MM3 MOTOR MANAGER 3 INSTRUCTION MANUAL GE MULTILIN WARRANTY CHAPTER 10 MISCELLANEOUS ...