9-5
Chapter 9. User-defined Addresses
z
z
RAM area
For the parameters that are read or written frequently, both the normal memory
area and the RAM area are available. If the parameter is frequently read or written,
specify a data address for the parameter in the RAM area.
There are two methods for specifying parameters in the RAM area.
•
Select a parameter whose name includes "Monitor (RAM)" for
[Parameter]
in the
user-defined address setting.
•
Enter one of the settings from 10 to 14, which specify the RAM area, for
[Decimal
point]
in the user-defined address settings.
Handling Precautions
•
The parameter values in the RAM area are not retained if a power failure
occurs. After a power failure, parameter values previously written in the
normal memory area are restored.
Communication read
RAM
RAM
Communication write
Parameter for setting
the normal area
Parameter for setting
the RAM area
Parameter for monitoring
the normal area
EEPROM
(Data is copied at power ON)
(Data is cleared at power OFF.)
Write
Read
•
When a parameter is read through communication, the data is read from RAM.
•
When data is written to a setting parameter in the normal memory area, the
data is written to both RAM and EEPROM.
•
When data is written to a setting parameter in the RAM area, the data is
written only to RAM.
•
When data is written to a monitoring parameter in the normal memory area,
the data is written only to RAM.
•
When the power is turned on, the data is copied from EEPROM to RAM.
•
If the firmware version of the MAIN block is earlier than 5.x.x (where x stands
for any number), RAM area specification by the decimal point position setting
is disabled. If the firmware version of the SLP-C7 is earlier than 1.6.x (where
x stands for any number), the RAM area cannot be specified by the decimal
point position setting.
