GE MM300 Function Code 08H, Function Code 10H, Master/slave packet format for function code 08H

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COMMUNICATIONS GUIDE

RS485 INTERFACE (MODBUS RTU)

Function Code 08H

Modbus Implementation: Loopback

Test MM300 Implementation: Loopback Test

This function is used to test the integrity of the communication link. The MM300 will echo the request.

For example, consider a loopback test from slave 17:

Table 7: Master/slave packet format for function code 08H

MASTER TRANSMISSION

BYTES

EXAMPLE

DESCRIPTION

 

 

 

 

SLAVE ADDRESS

1

11

message for slave

 

 

 

17

 

 

 

 

FUNCTION CODE

1

08

loopback test

 

 

 

 

DIAG CODE

2

00 00

must be 00 00

 

 

 

 

DATA

2

00 00

must be 00 00

 

 

 

 

CRC

2

E0 0B

CRC error code

 

 

 

 

SLAVE RESPONSE

BYTES

EXAMPLE

DESCRIPTION

 

 

 

 

SLAVE ADDRESS

1

11

message from

 

 

 

slave 17

 

 

 

 

FUNCTION CODE

1

08

loopback test

 

 

 

 

DIAG CODE

2

00 00

must be 00 00

 

 

 

 

DATA

2

00 00

must be 00 00

 

 

 

 

CRC

2

E0 0B

CRC error code

 

 

 

 

Function Code 10H

Modbus Implementation: Preset Multiple Registers

MM300 Implementation: Store Multiple Setpoints

This function code allows multiple Setpoints to be stored into the MM300 memory. Modbus “registers” are 16-bit (two byte) values transmitted high order byte first. Thus all MM300 setpoints are sent as two bytes. The maximum 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 MM300 response to this function code is to echo the slave address, function code, starting address, the number of Setpoints stored, and the CRC.

For example, consider a request for slave 17 to store the value 00 02 to setpoint address 04 5C and the value 01 F4 to setpoint address 04 5D. After the transmission in this example is complete, MM300 slave 17 will have the following setpoints information stored:

Address

Data

 

 

 

04

5C

00 02

 

 

 

04

5D

01 F4

 

 

 

The master/slave packets have the following format:

MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE

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Contents MM300 Page Table of Contents MM300 Motor Management System Communications Guide MM300 Motor Management System Communications Guide Data Frame Format and Data Rate Electrical InterfaceData Packet Format CRC-16 Algorithm Error CheckingMM300 supported functions TimingFunction Code 03H Master/slave packet format for function code 03H Function Code 04HMaster Transmission Bytes Example Description Slave Response Bytes Example DescriptionMaster/slave packet format for function code 04H Function Code 05HMaster/slave packet format for function code 05H Master/slave packet format for function code 06H Function Code 06HData CRC CB B9Function code 7 bitmask Function Code 07HMaster/slave packet format for function code 07H Function Code 10H Function Code 08HMaster/slave packet format for function code 08H Diag CodeMaster/slave packet format for function code 10H Error ResponsesActual Values Modbus memory mapREAL-TIME Clock General TimersTrip Counters Security CONTACT/VIRTUAL INPUTS/OUTPUTS StatusStatus Motor Current MeteringPower Metering Motor Starting Learned Data FLA RTD Maximium TemperatureGCP Factory Test User MAP ValuesStatus Buffer Event RecorderCommunication Settings Setpoints CommandsFlexlogic CommunicationCurrent Sensing REAL-TIME CLOCK/DAYLIGHT SavingsVoltage Sensing Motor Data SetupProcess Interlock RS485 Interface Modbus RTU Open Control Circuit Communication SetupUser MAP Addresses Mechanical JAM Reset SetupThermistor CPU RTD OPEN/SHORT Circuit REQUIRED=IOGGround Fault Underpower IOA + IOC or IOA + IOBUndercurrent REQUIRED=IOA FLAPhase Overvoltage REQUIRED=IOB Phase Undervoltage REQUIRED=IOBPhase Reversal REQUIRED=IOB Load IncreaseFlexlogic Timers MaintenanceStart Inhibit Restart BlockCommunications Guide RS485 Interface Modbus RTU Communications Guide RS485 Interface Modbus RTU Contact Input Assignment Auto / Manual Control Contact OutputsFlexlogic Equation Unsigned VALUE, 1 Decimal Place Unsigned ValueUnsigned VALUE, 2 Decimal Places Unsigned Long ValueDate MM/DD/YYYY Unsigned Long VALUE, 3 Decimal PlacesMSB LSBOn / YES OFF / noOFF USER2 USER1USER3 No Event/Trip To Date RS485 Interface Modbus RTU RS485 Interface Modbus RTU Not XOR Latch NOR Nand Timer Assign RS485 Interface Modbus RTU Definition RS485 Interface Modbus RTU MON SUNTUE WEDVbn Direct Bit FC180 FC181 FC182 FC183 RS485 Interface Modbus RTU Performing Commands Using Function Code 10H Master/slave packet format for performing commands Using the User Definable Memory MapCRC 7E CE RS485 Interface Modbus RTU Ethernet interface Fieldbus interface external connections Profibus Profibus Output DataProfibus LED indications LEDSystem Standard Diagnostics Bytes 1 through Profibus DP-DiagnosticsProfibus Input Data F1BCommunications Guide Fieldbus Interface Fieldbus interface external connections DeviceNet DeviceNet CommunicationsDeviceNet LED indications Class ObjectMessage Router Class Code 02H Identity Object Class Code 01HDeviceNet Object Class Code 03H Attribute Access Name Data Type Value Description Connection Object, Class Code 05h, ServicesDeviceNet Connection Object Class Code 05H Identity Object, Class Code 03h, Instance 01h, AttributesDeviceNet Motor Data Poll, Explicit Object Class Code A0H Motor Data Object, Class Code A0h, ServicesMotor Data Object, Class Code A0h, Attributes Item Description Size in Bytes Format Attribute Description Size in Bytes Explicit Motor Analog Data Object, Class Code B0h, Services0FH Attribute Item Description Size Format Bytes Data Formats, Explicit Motor Analog Data ObjectFieldbus Interface DeviceNet Explicit Motor Object, Class Code B1H Explicit Motor Control Object, Class Code B1h, ServicesExplicit Motor Control Object, Class Code B1h, Attributes Data Value, Class B1hFieldbus Interface

MM300 specifications

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