Function Code 07: Read Device Status - GE MOTOR MANAGEMENT RELAY 469 Instruction Manual

6 COMMUNICATIONS
Modbus Implementation:
469 Implementation:
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:
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
If status is neither stopped or running, motor is starting.
NOTE
MESSAGE FORMAT AND EXAMPLE
Request status from slave 11.
MASTER TRANSMISSION:
SLAVE ADDRESS
FUNCTION CODE
CRC
SLAVE RESPONSE:
SLAVE ADDRESS
FUNCTION CODE
DEVICE STATUS
CRC
GE Power Management
Read Exception Status
Read Device Status
BYTES EXAMPLE / DESCRIPTION
1 0B
1 07
2 47 42
BYTES EXAMPLE / DESCRIPTION
1 0B
1 07
1 59
2 C2 08
469 Motor Management Relay
6.2 SUPPORTED MODBUS FUNCTIONS

6.2.6 FUNCTION CODE 07: READ DEVICE STATUS

message for slave 11
read device status
CRC calculated by the master
response message from slave 11
read device status
status = 01011001 in binary
CRC calculated by the slave
6
6-11