Function Code 07H - GE MOTOR MANAGER 2 Instruction Manual

6.2 MODBUS FUNCTIONS
Modbus Implementation: Read Exception Status
MM2 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. For this example, consider the following MM2 general status byte:
LSBit: B0: Alarm condition = 1
B1: Trip condition = 1
B2: Internal fault = 1
B3: Auto mode selected = 1
B4: Contactor A N/O (input closed = 1, open = 0)
B5: Contactor B N/O (input closed = 1, open = 0)
B6: AUX Relay 1 Status
MSBit: B7: AUX Relay 2 Status
The master/slave packets have the following format:
Table 6–6: MASTER/SLAVE PACKET FORMAT FOR FUNCTION CODE 07H
MASTER TRANSMISSION
SLAVE ADDRESS
6
FUNCTION CODE
CRC
SLAVE RESPONSE
SLAVE ADDRESS
FUNCTION CODE
DEVICE STATUS (see definition above)
CRC
6-10
BYTES EXAMPLE
1 11
1 07
2 4C 22
BYTES EXAMPLE
1 11
1 07
1 2C
2 22 28
MM2 Motor Manager 2
6 COMMUNICATIONS

6.2.6 FUNCTION CODE 07H

DESCRIPTION
message for slave 17
read device status
CRC error code
DESCRIPTION
message from slave 17
read device status
status = 00101100 (in binary)
CRC error code
GE Power Management