GE MM300 Manual page 36
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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MODBUS MEMORY MAP
Modbus
Hex
Description
40774
0305
RTD 3 Alarm Temp
40775
0306
RTD 3 Trip Voting
40776
0307
RTD 3 Trip Temp
RTD #4 (REQUIRED=IO_G)
40777
0308
RTD 4 Application
40778
0309
RTD 4 Name
40788
0313
RTD 4 Alarm Temp
40789
0314
RTD 4 Trip Voting
40790
0315
RTD 4 Trip Temp
RTD #5 (REQUIRED=IO_G)
40791
0316
RTD 5 Application
40792
0317
RTD 5 Name
40802
0321
RTD 5 Alarm Temp
40803
0322
RTD 5 Trip Voting
40804
0323
RTD 5 Trip Temp
RTD #6 (REQUIRED=IO_G)
40805
0324
RTD 6 Application
40806
0325
RTD 6 Name
40816
032F
RTD 6 Alarm Temp
40817
0330
RTD 6 Trip Voting
40818
0331
RTD 6 Trip Temp
40819
0332
Reserved
▼
▼
▼
40824
0337
Reserved
THERMISTOR (CPU)
40825
0338
Cold Resistance
40826
0339
Hot Resistance
40827
033A
Thermistor Alarm
40828
033B
Thermistor Trip
40829
033C
Reserved
▼
▼
▼
40833
0340
Reserved
UNDERCURRENT (REQUIRED=IO_A)
40834
0341
Undercurrent Alarm Level
40835
0342
Undercurrent Alarm Delay
40836
0343
Undercurrent Trip Level
40837
0344
Undercurrent Trip Delay
40838
0345
Reserved
40839
0346
Reserved
40840
0347
Reserved
40841
0348
Reserved
UNDERPOWER (IO_A + IO_C) OR (IO_A + IO_B)
40842
0349
Underpower Alarm Level
40843
034A
Underpower Alarm Delay
40844
034B
Underpower Trip Level
40845
034C
Underpower Trip Delay
2–28
Min
Max
Step
-50
251
1
0
6
1
-50
251
1
0
4
1
0
10
1
-50
251
1
0
6
1
-50
251
1
0
4
1
0
10
1
-50
251
1
0
6
1
-50
251
1
0
4
1
0
10
1
-50
251
1
0
6
1
-50
251
1
---
---
---
▼
▼
▼
---
---
---
1
300
1
1
300
1
0
1
1
0
1
1
---
---
---
▼
▼
▼
---
---
---
1
101
1
1
60
1
1
101
1
1
60
1
---
---
---
---
---
---
---
---
---
---
---
---
1
101
1
1
60
1
1
101
1
1
60
1
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
CHAPTER 2: RS485 INTERFACE (MODBUS RTU)
Units
Format Default
*
°C
F4
251
---
FC122
0
*
°C
F4
251
---
FC121
0
---
F22
17
*
°C
F4
251
---
FC122
0
*
°C
F4
251
---
FC121
0
---
F22
18
*
°C
F4
251
---
FC122
0
*
°C
F4
251
---
FC121
0
---
F22
19
*
°C
F4
251
---
FC122
0
*
°C
F4
251
---
---
---
▼
▼
▼
---
---
---
k ohms
F2
1
k ohms
F2
50
---
FC126
0
---
FC126
0
---
---
---
▼
▼
▼
---
---
---
*
%FLA
F1
101
s
F1
1
*
%FLA
F1
101
s
F1
1
---
---
---
---
---
---
---
---
---
---
---
---
*
%MNR
F1
101
s
F1
1
*
%MNR
F1
101
s
F1
1
Size in
Words
1
1
1
1
10
1
1
1
1
10
1
1
1
1
10
1
1
1
1
▼
1
1
1
1
1
1
▼
1
1
1
1
1
1
1
1
1
1
1
1
1
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Table of Contents
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