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178
(4) Backup of the calculated value on completion of auto tuning
By setting the following buffer memory area to Enable (1) at the start of auto tuning, the calculated value
( Page 177, Section 4.6 (3)) is automatically backed up into E
2
PROM on completion of auto tuning.
•CH Automatic backup setting after auto tuning of PID constants (Un\G63, Un\G95, Un\G127, Un\G159)
( Page 128, Section 3.4.2 (37))
To read the calculated value ( Page 177, Section 4.6 (3)) from E
2
PROM to the buffer memory, set the
following buffer memory area to Requested (1).
•CH E
2
PROM's PID constants read instruction (Un\G62, Un\G94, Un\G126, Un\G158) ( Page 127,
Section 3.4.2 (36))
To use the PID constants stored in the buffer memory also after the power is turned off, follow the methods below.
• Use the initial setting of GX Works2. ( Page 300, Section 6.3)
• Keep the PID constants in E
2
PROM, and transfer them when the power is turned on from off or when the CPU
module is released from the reset status. ( Page 270, Section 4.30)
• Write the value directly into the buffer memory through a sequence program.