GE MM300 Manual page 104
Motor management system/low voltage motor protection and control
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Also See for MM300:
- Instruction manual (198 pages) ,
- Quick start manual (77 pages) ,
- Installation recommendations (21 pages)
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PROFIBUS DPV1
4–26
3URILEXV '39 :ULWH VHWSRLQW SURFHVV
3URILEXV 0DVWHU
5HTXHVW DFHVV
OHYHO
+DV DFFHVV
SULYLOHJHV"
<HV
6HQG SUHVHW
YDOXHV
Example: Request to change Modbus slave address id to 254: access level 1 is required
(consider password 11111 (2B67 in hexadecimal format) allow access to security level 1).
Step Direction
Description
1
Master -> Slave
Request current
security access level
Slave -> Master
Answer: current
security access level
2
Master -> Slave
Send password
entry
Slave -> Master
Write success
$QVZHU DFFHVV
1R
6HQG SDVVZRUG
HQWU\
SDVVZRUG"
8SGDWH DFFHVV
OHYHO UHJLVWHU
9DOLG DFFHVV
6DYH 6HWSRLQWV
Parameter
Profibus DPV1 Message (hex)
Address
Slot
(hex)
012D
31
31
0457
14
14
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
CHAPTER 4: FIELDBUS INTERFACE
3URILEXV 6ODYH
OHYHO
9DOLG
1R
,JQRUH
<HV
1R
,JQRUH
OHYHO"
Index
Length
Data
(bytes)
2D
None
2D
2
Access
level
57
2
2B 67
57
0
None
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Need help?
Do you have a question about the MM300 and is the answer not in the manual?
Questions and answers
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?
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