Rockwell Automation SB3000 Universal Drive Controller Module - Manual (Page 14)

2-2 Universal Drive Controller Module
The UDC module contains three types of memory, as shown below.
The non-volatile flash memory contains the operating systems for the UDC module
and the PMI, the drive configuration information, the UDC application tasks (one for
each drive), and the tunable variable data. After the initial power-up of the AutoMax
rack, all of this data must be loaded to the UDC module using the AutoMax
Programming Executive software. Note that the UDC EM module (B/M O-57652)
provides more non-volatile read/write flash memory for storing operating systems.
After power-up, the UDC operating system and the UDC tasks (if they exist) are read
into SRAM from flash memory. The SRAM is also used to store all the local variables.
Note that local variables are not retained through a power cycle, but tunable variables
are retained.
The dual port memory is used as a storage buffer for exchanging data with other
modules in the AutoMax rack. The dual port memory on a UDC module can be
accessed by the AutoMax Processor and the UDC microprocessor.
UDC Memory Type
UDC Memory Size
1
1. Both modules contain the same amount of memory for application tasks.
UDC Module
B/M O-57552
UDC EM Module
B/M O-57652
Non-volatile read/write flash 256 Kbytes 384 Kbytes
Volatile SRAM (local memory) 512 Kbytes 512 Kbytes
Dual port SRAM 4 Kbytes 4 Kbytes