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6 COMMUNICATIONS
The MM3 contains a User Definable area in the memory map. This area allows re-mapping of the addresses of
any Actual Values or Setpoints registers. The User Definable area has two sections:
1. A Register Index area (memory map addresses 1280H-12F7H) that contains 120 Actual Values or Set-
points register addresses.
2. A Register area (memory map addresses 0100H-0177H) that contains the data at the addresses in the
Register Index.
Register data that is separated in the rest of the memory map may be re-mapped to adjacent register
addresses in the User Definable Registers area. This is accomplished by writing to register addresses in the
User Definable Register Index area. This allows for improved throughput of data and can eliminate the need for
multiple read command sequences. The User Definable Register Index is stored as a setpoint and therefore it
is "remembered" even when the power is removed.
For example, if the values of Phase A Current (register address 0031H) and DRIVE STATUS (register address
0023H) are required to be read from a MM3, their addresses may be re-mapped as follows:
1. Write 0031H to address 1280H (User Definable Register Index 0000) using function code 06 or 16.
2. Write 0023H to address 1281H (User Definable Register Index 0001) using function code 06 or 16.
The MM3PC software can be used to write these locations to the User Definable Register Index.
1. Select Communication/Trouble Shooting sub-menu Memory Map Inspection.
2. At the bottom of the screen, under the title "User Memory Map Insertion (write)", in the address box put the
first index address 1280.
3. In the values box put the address of the data you want to read i.e. 0x0031 (Type 0x to indicate a hex
address).
4. Press Send.
5. Press OK.
6. Repeat the above steps for the other data registers you want to read, changing the index address each
time.
It is now possible to read these two data registers with one read, at addresses 0100H, 0101H. Address 0100H
will contain Phase A Current. Address 0x0101 will contain DRIVE STATUS.
GE Power Management
6.4.3 USING THE USER DEFINABLE MEMORY MAP
MM3 Motor Manager 3
6.4 APPLICATIONS
6
6-15
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