Devicenet Power Supply Configuration - GE MM300 Manual

Motor management system/low voltage motor protection and control
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DEVICENET PROTOCOL
NOTE:
NOTE

DeviceNet power supply configuration

NOTE:
NOTE
4–42
Table 4-9: Fieldbus interface external connections (DeviceNet)
Path
Connection (external)
V–
Pin 3, CAN_GND
L
Pin 2, CAN_L
C
Pin 5, CAN_SHLD
H
Pin 7, CAN_H
V+
Pin 9, CAN_V
The module status (MS) and network status (NS) LEDs indicate the status of the Fieldbus
interface.
Table 4-10: DeviceNet LED indications
LED
LED operation
MS
Green on, red on, green on
Flashing green
Green on
Flashing red
Red on
NS
Flashing green
Green on
Flashing red
Red on
Red and green
When used for DeviceNet, the fieldbus port has the following characteristics.
Baud rate: 125, 250, and 500 kbps
MAC ID: 0 to 63
Vendor ID: 928
Product Code: 0x4D42
Message types: poll, and explicit messaging
The ODVA cable assembly length (0.4 meter) must be considered in calculating the network
drop length budget to the node.
The DeviceNet port uses external voltage to power the electronics. The figures below show
the configuration of the comms board option/power supply switch.
Devicenet supports external power only.
Figure 4-10: Comms board power supply configuration
ON
1 2 3 4 5 6 7 8
= switch position
Wire color
Black
Blue
Bare
White
Red
Description
Device self-test
Device in standby state
Device operational
Recoverable fault
Unrecoverable fault
Online, not connected
Online, connected
Connection timeout
Critical link failure
Network access detected
DEVICENET WITH EXTERNAL SUPPLY
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
CHAPTER 4: FIELDBUS INTERFACE
853846A1.CDR

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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.

This answer is automatically generated

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