User guide

76 Rockwell Automation Publication 1560E-UM051F-EN-P - June 2013
Chapter 4 Programming
Parameter Management
Before you begin programming, it is important to understand how the controller
memory is:
• structured within the SMC Flex controller
• used on power-up and during normal operation
Refer to Figure 44
and explanations below.
Figure 44 - Memory Block Diagram
Random Access Memory (RAM)
This is the work area of the controller after it is powered up. When you modify
parameters in the Setup mode, the new values are stored in RAM. When power is
applied to the controller, parameter values stored in the EEPROM are copied to
RAM. RAM is volatile and the values stored in this area are lost when the
controller is powered down.
Read-Only Memory (ROM)
The SMC Flex controller comes with factory default parameter values. These
settings are stored in nonvolatile ROM and are displayed the first time you enter
the Program mode.
Esc
Sel
Esc Sel
EEPROM RAM ROM