GE Industrial Solutions EntelliPro ES - Manual (Page 151)

4.14 EP OS MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
CHAPTER 4: COMMUNICATION
4.1.10.5 Function Code 10H
Modbus Implementation: Preset Multiple Registers
EntelliPro ES Implementation: Store Multiple Setpoints
This function code allows multiple Setpoints to be stored into the EntelliPro ES memory. Modbus “registers” are
16-bit (two byte) values transmitted high order byte first . Thus all EntelliPro ES setpoints are sent as two
bytes. The maximum number of Setpoints that can be stored in one transmission is dependent on the slave
device. Modbus allows up to a maximum of 60 holding registers to be stored. The EntelliPro ES response to
this function code is to echo the slave address, function code, starting address, the number of Setpoints
stored, and the CRC.
For example, consider a request for slave 17 to store the value 00 02 to setpoint address 04 5C and the value
01
F4 to setpoint address 04 5D.
After the transmission in this example is complete, EntelliPro ES slave 17 will
have the following setpoints information stored: The master/slave packets have the following format:
Master Transmission Bytes Example Description
SLAVE ADDRESS 1 11 message for slave 17
FUNCTION CODE 1 10 store setpoints
DATA STARTING ADDRESS 2 04 5C setpoint address
0 4 5C
NUMBER OF SETPOINTS 2 00 02 2 setpoints = 4 bytes total
BYTE COUNT 1 04 4 bytes of data
DATA 1 00 02 data for setpoint address
04 5C
DATA 2 01 F4 data for setpoint address
04 5D
CRC 2 31 11 CRC error code
Slave Response Bytes Example Description
SLAVE ADDRESS 1 11 message from slave 17
FUNCTION CODE 1 10 store setpoints
DATA STARTING ADDRESS 2 04 5C setpoint address 04 5C
NUMBER OF SETPOINTS 2 00 02 2 setpoints
CRC 2 82 7A CRC error code
Table 4-7: Master/Slave Packet Format For Function Code 10H