4-6 Programming
Parameter Management Before you begin programming, it’s 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 4.3 and the explanations below.
Figure 4.3 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 Program 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
loses power.
Read-only Memory (ROM)
The SMC-Flex controller comes with factory default parameter
values. These settings are stored in non-volatile ROM and are
displayed the first time you enter the Program mode.
Electrically Erasable Programmable Read-only Memory
(EEPROM)
The SMC-Flex controller provides a non-volatile area for storing
user-modified parameter values in the EEPROM.
EEPROM RAM ROM
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