Format Codes - GE MM300 Manual
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 2: RS485 INTERFACE (MODBUS RTU)
Modbus
Hex
Description
41576
0627
Hard Wired Stop Actn
41577
0628
Hard Wired 2W/3W
41578
0629
Field Start Ctrl
41579
062A
Field Stop Mode
41580
062B
Field Stop Action
41581
062C
Field 2W/3W
41582
062D
MCC Start Ctrl
41583
062E
MCC Stop Mode
41584
062F
MCC Stop Action
41585
0630
Test Auto Mode
41586
0631
Test Manual Mode
41587
0632
External Stop Action
41588
0633
Auto/Manual Key
41589
0634
Reserved
▼
▼
▼
41696
069F
Reserved
FLEXLOGIC EQUATION
41697
06A0
Flex Equation
42209
08A0
Reserved
▼
▼
▼
43763
0EB2
Reserved
1. Maximum setpoint value represents OFF
2.Modbus registers 30391 and 30398 both represent the same actual value, Apparent Power.
Format codes
MM300 MOTOR MANAGEMENT SYSTEM – COMMUNICATIONS GUIDE
Min
0
0
0
0
0
0
0
0
0
0
0
0
0
---
▼
0
---
▼
Code
Type
F1
16 bits
Example: 1234 stored as 1234
F2
16 bits
Example: 123.4 stored as 1234
F3
16 bits
Example: 12.34 stored as 1234
F4
16 bits
Example: -1234 stored as -1234 i.e. 64302
F6
16 bits
Example: -12.34 stored as -1234 i.e. 64302
F9
32 bits
Max
Step
Units
1
1
---
1
1
---
1
1
---
1
1
---
1
1
---
1
1
---
1
1
---
1
1
---
1
1
---
2
1
---
2
1
---
1
1
---
1
1
---
---
---
---
▼
▼
▼
0xFFFF
1
---
---
---
▼
▼
▼
Definition
UNSIGNED VALUE - Maximum Setpoint Value
represents OFF when marked "*" on the Modbus
Memory Map
UNSIGNED VALUE, 1 DECIMAL PLACE - Maximum
Setpoint Value represents OFF when marked "*" on
the Modbus Memory Map
UNSIGNED VALUE, 2 DECIMAL PLACES - Maximum
Setpoint Value represents OFF when marked "*" on
the Modbus Memory Map
2's COMPLEMENT SIGNED VALUE - Maximum Setpoint
Value represents OFF when marked "*" on the Modbus
Memory Map
2's COMPLEMENT SIGNED VALUE, 2 DECIMAL PLACES
UNSIGNED LONG VALUE
FORMAT CODES
Format Default
Size in
Words
FC174
0
1
FC173
1
1
FC126
0
1
FC172
0
1
FC174
0
1
FC173
1
1
FC126
0
1
FC172
0
1
FC174
0
1
FC175
1
1
FC175
0
1
FC174
0
1
FC126
0
1
---
---
7
▼
▼
▼
1
FC142
0x400
512
---
---
1
▼
▼
▼
2
2–39
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Table of Contents
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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