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GE Power Management 469 Motor Management Relay 6-13

6 COMMUNICATIONS 6.2 SUPPORTED MODBUS FUNCTIONS

6.2.8 FUNCTION CODE 16: STORE MULTIPLE SETPOINTS

Modbus Implementation: Preset Multiple Registers

469 Implementation: Store Multiple Setpoints

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 Data

1180 01F4

1181 01DE

MASTER TRANSMISSION: BYTES EXAMPLE / DESCRIPTION

SLAVE ADDRESS 1 0B message for slave 11

FUNCTION CODE 1 10 store setpoints

DATA STARTING ADDRESS 2 11 80 setpoint address 1180

NUMBER OF SETPOINTS 2 00 02 2 setpoints (4 bytes total)

BYTE COUNT 1 04 4 bytes of data

DATA 1 2 01 F4 data for address 1180

DATA 2 2 01 DE data for address 1181

CRC 2 DB B1 CRC calculated by the master

SLAVE RESPONSE: BYTES EXAMPLE / DESCRIPTION

SLAVE ADDRESS 1 0B response message from slave 11

FUNCTION CODE 1 10 store setpoints

DATA STARTING ADDRESS 2 11 80 setpoint address 1180

NUMBER OF SETPOINTS 2 00 02 2 setpoints

CRC 2 45 B6 CRC calculated by the slave

GE 469 Manual

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