GE MM300 Manual page 115
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)
Table of Contents
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CHAPTER 4: FIELDBUS INTERFACE
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
Byte
299
47
300
47
301
47
302
47
303
47
304
48
305
48
306
48
307
48
308
48
309
48
310
48
311
48
312
49
313
49
314
49
315
49
316
49
317
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318
49
319
49
320
50
321
50
322
50
323
50
324
50
325
50
326
50
327
50
328
51
329
51
330
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331
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332
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333
51
334
51
335
51
336
52
337
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338
52
339
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340
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341
52
342
52
343
52
Bit
GSE Bit #
3
323
4
324
5
325
6
326
7
327
0
328
Slot Number
1
329
2
330
3
331
4
332
5
333
6
334
7
335
0
336
Alarm Specifier
1
337
2
338
3
339
4
340
5
341
6
342
7
343
0
344
Reserved
1
345
Reserved
2
346
Reserved
3
347
Reserved
4
348
Reserved
5
349
Reserved
6
350
Reserved
7
351
Reserved
0
352
Reserved
1
353
Reserved
2
354
Reserved
3
355
Reserved
4
356
Reserved
5
357
Reserved
6
358
Reserved
7
359
Reserved
0
360
Reserved
1
361
Reserved
2
362
Reserved
3
363
Reserved
4
364
Reserved
5
365
Reserved
6
366
Reserved
7
367
Reserved
PROFIBUS DPV1
Ext.
Diag
Byte
41
41
41
41
41
42
42
42
42
42
42
42
42
43
43
43
43
43
43
43
43
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44
44
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45
45
45
45
45
45
45
45
46
46
46
46
46
46
46
46
4–37
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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