GE MOTOR MANAGER 2 User Manual

6-10 MM2 Motor Manager 2
GE Power Management
6.2 MODBUS FUNCTIONS 6 COMMUNICATIONS
6
6.2.6 FUNCTION CODE 07H
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:
The master/slave packets have the following format:
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
Table 6–6: MASTER/SLAVE PACKET FORMAT FOR FUNCTION CODE 07H
MASTER TRANSMISSION BYTES EXAMPLE DESCRIPTION
SLAVE ADDRESS 1 11 message for slave 17
FUNCTION CODE 1 07 read device status
CRC 2 4C 22 CRC error code
SLAVE RESPONSE BYTES EXAMPLE DESCRIPTION
SLAVE ADDRESS 1 11 message from slave 17
FUNCTION CODE 1 07 read device status
DEVICE STATUS (see definition above) 1 2C status = 00101100 (in binary)
CRC 2 22 28 CRC error code

GE MOTOR MANAGER 2 Specifications

General

Brand	GE
Model	MOTOR MANAGER 2
Category	Controller
Language	English