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GE Power Management 469 Motor Management Relay 6-11

6 COMMUNICATIONS 6.2 SUPPORTED MODBUS FUNCTIONS

6.2.6 FUNCTION CODE 07: READ DEVICE STATUS

Modbus Implementation: Read Exception Status

469 Implementation: Read Device Status

This is a function used to quickly read the status of a selected device. A short message length allows for rapid

reading of status. The status byte returned will have individual bits set to 1 or 0 depending on the status of the

slave device.

469 General Status Byte:

If status is neither stopped or running, motor is starting.

MESSAGE FORMAT AND EXAMPLE

Request status from slave 11.

Bit No. Description

B0 R1 Trip relay operated = 1

B1 R2 Auxiliary relay operated = 1

B2 R3 Auxiliary relay operated = 1

B3 R4 Alarm relay operated = 1

B4 R5 Block start relay operated = 1

B5 R6 Service relay operated = 1

B6 Stopped = 1

B7 Running = 1

MASTER TRANSMISSION: BYTES EXAMPLE / DESCRIPTION

SLAVE ADDRESS 1 0B message for slave 11

FUNCTION CODE 1 07 read device status

CRC 2 47 42 CRC calculated by the master

SLAVE RESPONSE: BYTES EXAMPLE / DESCRIPTION

SLAVE ADDRESS 1 0B response message from slave 11

FUNCTION CODE 1 07 read device status

DEVICE STATUS 1 59 status = 01011001 in binary

CRC 2 C2 08 CRC calculated by the slave

NOTE

GE 469 Manual

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