Electrical Interface ...................................................................................................................................... 2-1

Data Frame Format and Data Rate.................................................................................................... 2-2

Data Packet Format ................................................................................................................................... 2-2

Error Checking .............................................................................................................................................. 2-2

CRC-16 Algorithm........................................................................................................................................ 2-3

Timing ............................................................................................................................................................... 2-3

MM300 supported functions.................................................................................................................. 2-4

Modbus Functions ..............................................................................................................................2-4

Function Code 03H ..................................................................................................................................... 2-4

Function Code 04H ..................................................................................................................................... 2-5

Function Code 05H ..................................................................................................................................... 2-5

Function Code 06H ..................................................................................................................................... 2-6

Function Code 07H ..................................................................................................................................... 2-7

Function Code 08H ..................................................................................................................................... 2-8

Function Code 10H ..................................................................................................................................... 2-8

Error Responses ........................................................................................................................................... 2-9

Modbus memory map ................................................................................................................... 2-10

Format codes..................................................................................................................................... 2-39

Performing Commands Using Function Code 10H.......................................................... 2-66

Using the User Definable Memory Map..........................................................................................2-66

Configurable Fieldbus input data ................................................................................................4-1

Profibus DP.............................................................................................................................................4-3

Profibus power supply configuration................................................................................................. 4-4

Profibus termination .................................................................................................................................. 4-5

Profibus DP-parameterization............................................................................................................... 4-5

Profibus DP-configuration....................................................................................................................... 4-6

Profibus Input Data .................................................................................................................................... 4-8

Profibus Output Data...............................................................................................................................4-10

Profibus DPV0-Diagnostics ...................................................................................................................4-10

Profibus DPV1 .................................................................................................................................... 4-21

Profibus DPV1-Acyclic read/write data...........................................................................................4-21

Extended Profibus DPV1 functionality.............................................................................................4-24

Acyclic Read Operation (Modbus functions 03H and 04H) ................................................... 4-24

Parameter Acyclic Write Operation (Modbus function 10H)................................................. 4-25

Execute Operation Command (Modbus function 05H) ........................................................... 4-27

Preset Single Register (store single setpoint - Modbus function 06H)............................. 4-28

Profibus DPV1-Diagnostics ...................................................................................................................4-28

I&M (Identification & Maintenance) records..................................................................................4-39

DeviceNet protocol.......................................................................................................................... 4-41

DeviceNet power supply configuration ..........................................................................................4-42

DeviceNet setup and configuration (typical) ................................................................................4-43

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Do you have a question about the MM300 and is the answer not in the manual?

Questions and answers

Kristiyan

March 31, 2025

we have a problem with device MM300. it says that the device is invalid through the software and does not read the device. the communication is through RS 485. is it possible to give us an advice or send us some reccomendations or instructions?

1 comments:

Mr. Anderson

March 31, 2025

For a GE MM300 device that is not recognized by software and communicates via RS485, follow these troubleshooting steps:

1. Ensure correct RS485 wiring:
- Use two-wire RS485 in a daisy chain configuration.
- Install a 120 Ohm resistor in series with a 1 nF ceramic capacitor at each end of the link.
- Use shielded wire and ground the shield at only one location.

2. Check device addressing and termination:
- Confirm proper device address and ensure no address conflicts.
- Verify that termination networks are correctly installed at both ends.

3. Confirm half-duplex communication:
- Ensure that the system supports half-duplex communication and not sending and receiving data simultaneously.

4. If using USB for setup (e.g., USB-to-RS485 converter) and the device is not recognized:
- Repeat the connection procedure 2–3 times.
- If still not recognized, uninstall the USB driver from Device Manager under modems.
- Disconnect the USB cable, wait at least 10 seconds, then reconnect.
- When prompted by the Hardware Wizard, select "No, not this time," then "Install the software automatically," and press "Continue Anyway."
- Finish the installation and check if the USB device appears in the setup software.

These steps help ensure proper hardware connection and correct software recognition of the MM300 device.