136
8.1.7
Set value backup
This function allows remote buffer memory data to be stored in the non-volatile memory and backed up.
The backed-up data is transferred from the non-volatile memory to the remote buffer memory when the power is
turned off and on. Therefore, temperature can be controlled without newly writing data when the power is turned off
and on.
(1) Applicable remote buffer memory areas
For the applicable remote buffer memory, refer to the following.
(2) Data write to non-volatile memory
With this function, PID constants set by auto tuning can be backed up. When data is written to non-volatile
memory and the power is turned off and on, the remote buffer memory setting value is not required to be set
again.
For the function that allows PID constants to be automatically backed up after auto tuning, refer to the following.
To write data to non-volatile memory, turn off and on Set value backup instruction (RY15).
When data write to the non-volatile memory is completed, Back-up of the set value completion flag (RX15) turns
on.
If data write to non-volatile memory does not complete, Back-up of the set value fail flag (RX17) turns on.
(a) Setting change
Change the settings for remote buffer memory areas when Back-up of the set value completion flag (RX15) is
off.
Common
Read
OS
CPU module
2. Write
Non-volatile memory
When the power is
turned off and on
Temperature control module
1. Set value backup
instruction (RY15):
ON (write instruction)
3. Back-up of the set
value completion flag
(RX15): ON
(completed)
Remote buffer
memory data
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