4-6 Programming
1560D-UM051D-EN-P – February 2005
Parameter Management Before you begin programming, it is important to understand how the
controller memory is:
• structured within the SMC Dialog Plus™ controller
• used on power-up and during normal operation
Refer to Figure 4.2 and explanations below.
Figure 4.2
Memory Block Diagram
EEPROM RAM ROM
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 is powered down.
Read-only Memory (ROM)
The SMC Dialog Plus 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.
Electrically Erasable Programmable Read-only Memory (EEPROM)
The SMC Dialog Plus controller provides a nonvolatile area for storing
user-modified parameter values in the EEPROM.
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