GE MM300 Manual page 92
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 DP
4–14
Byte
99
22
100
22
101
22
102
22
103
22
104
23
105
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108
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27
Bit
GSE Bit #
3
123
Reserved
4
124
Reserved
5
125
Reserved
6
126
Reserved
7
127
Reserved
0
128
Reserved
1
129
Reserved
2
130
Reserved
3
131
Reserved
4
132
Reserved
5
133
Reserved
6
134
Reserved
7
135
Reserved
0
136
Reserved
1
137
Reserved
2
138
Reserved
3
139
Reserved
4
140
Reserved
5
141
Reserved
6
142
Reserved
7
143
Reserved
0
144
Reserved
1
145
Reserved
2
146
Reserved
3
147
Reserved
4
148
Reserved
5
149
Reserved
6
150
Reserved
7
151
Reserved
0
152
Reserved
1
153
Reserved
2
154
Reserved
3
155
Reserved
4
156
Reserved
5
157
Reserved
6
158
Reserved
7
159
Reserved
0
160
Reserved
1
161
"Self Test Alarm"
2
162
"Comm Fail Alarm"
3
163
Reserved
4
164
Reserved
5
165
Reserved
6
166
Reserved
7
167
Reserved
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
CHAPTER 4: FIELDBUS INTERFACE
Ext.
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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