Function Code 16: Store Multiple Setpoints - GE MOTOR MANAGEMENT RELAY 469 Instruction Manual

6 COMMUNICATIONS
Modbus Implementation:
469 Implementation:
This function code allows multiple setpoints to be stored into the 469 memory. Modbus "registers" are 16-bit
(two byte) values transmitted high order byte first. Thus all 469 setpoints are sent as two byte values. The max-
imum 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 469 response to this function code is to echo
the slave address, function code, starting address, the number of Setpoints stored, and the CRC.
MESSAGE FORMAT AND EXAMPLE
Request slave 11 to store the value 01F4 to Setpoint address 1180 and the value 01DE to setpoint address
1181. After the transmission in this example is complete, 469 slave 11 will have the following Setpoints infor-
mation stored:
Address
1180
1181 01DE
MASTER TRANSMISSION:
SLAVE ADDRESS
FUNCTION CODE
DATA STARTING ADDRESS
NUMBER OF SETPOINTS
BYTE COUNT
DATA 1
DATA 2
CRC
SLAVE RESPONSE:
SLAVE ADDRESS
FUNCTION CODE
DATA STARTING ADDRESS
NUMBER OF SETPOINTS
CRC
GE Power Management

6.2.8 FUNCTION CODE 16: STORE MULTIPLE SETPOINTS

Preset Multiple Registers
Store Multiple Setpoints
Data
01F4
BYTES
1
1
2
2
1
2
2
2
BYTES
1
1
2
2
2
469 Motor Management Relay
6.2 SUPPORTED MODBUS FUNCTIONS
EXAMPLE / DESCRIPTION
0B message for slave 11
10 store setpoints
11 80 setpoint address 1180
00 02 2 setpoints (4 bytes total)
04 4 bytes of data
01 F4 data for address 1180
01 DE data for address 1181
DB B1 CRC calculated by the master
EXAMPLE / DESCRIPTION
0B response message from slave 11
10 store setpoints
11 80 setpoint address 1180
00 02 2 setpoints
45 B6 CRC calculated by the slave
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