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CHAPTER 3 SPECIFICATIONS
3
3.4 Buffer Memory Assignment
3.4.2 Details of the buffer memory
(c) ON/OFF timing for 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))
The following figure shows ON/OFF timing of this flag for CH Automatic backup setting after auto tuning of
PID constants (Un\G63, Un\G95, Un\G127, Un\G159). (For CH1)
When the data writing to E
2
PROM is completed normally, CH Write completion flag (b4 to b7 of Un\G31)
turns on.
CH Write completion flag (b4 to b7 of Un\G31) turns off when CH Automatic backup setting after auto
tuning of PID constants (Un\G63, Un\G95, Un\G127, Un\G159) is set to Disable (0) from Enable (1).
When the data writing to E
2
PROM fails, CH Write failure flag (b12 to b15 of Un\G31) of the corresponding
channel turns on and the Q64TCN operates with PID constants calculated in the previous auto tuning. (The
LED status remains.)
CH Write failure flag (b12 to b15 of Un\G31) turns off when the data writing of the corresponding channel is
completed normally.
When the data writing fails, perform auto tuning again by turning CH Auto tuning instruction (Yn4 to Yn7) ON
OFF ON. If the data writing fails even after executing auto tuning again, a hardware error can be the
reason. Please consult your local Mitsubishi representative.
● By referring to this flag at the completion of auto tuning, whether the automatic data backup is completed normally or not
can be checked.
● After confirming that the following flags are on, set CH Automatic backup setting after auto tuning of PID constants
(Un\G63, Un\G95, Un\G127, Un\G159) to Disable (0).
•CH Write completion flag (b4 to b7 of Un\G31) (when automatic backup is completed normally)
•CH Write failure flag (b12 to b15 of Un\G31) (when automatic backup fails)
If auto tuning is executed under Enable (1), although PID constants are stored after auto tuning is complete, CH Auto
tuning status (Xn4 to Xn7) does not turn off.
For details on the auto tuning function, refer to the following.
Page 176, Section 4.6
0
0
01
1
CH1 Automatic backup setting after
auto tuning of PID constants
(Un\G63)
CH1 Write completion flag
(b4 of Un\G31)
CH1 Write failure flag
(b12 of Un\G31)
Auto tuning completion
(Write failure)
CH1 Auto tuning status (Xn4)
Auto tuning completion
(Write failure)
OFF
OFF
OFF
ON
ON
ON
Executed by the Q64TCN
Executed in a sequence program