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CHAPTER 3 SPECIFICATIONS
3
3.4 Buffer Memory Assignment
3.4.2 Details of the buffer memory
(69)CH Self-tuning flag (Un\G575, Un\G607, Un\G639, Un\G671)
The execution status of self-tuning can be monitored in this buffer memory area.
For details on the self-tuning function, refer to the following.
Page 223, Section 4.18
The following contents are stored in each bit.
• 0: OFF
• 1: ON
Bit Flag name
Condition on which value turns to 1
(ON)
Condition on which value turns to 0
(OFF)
b0
PID auto-correction
status
This flag is set to 1 (ON) when PID
constants are corrected by the self-tuning.
This flag is set to 0 (OFF) when either of the
following operation is performed.
• When the operation mode shifts to the setting
mode by turning off from on Setting/operation
mode instruction (Yn1)
• When CH Unused channel setting
(Un\G61, Un\G93, Un\G125, Un\G157) is set
to Unused (1)
• When CH PID control forced stop
instruction (YnC to YnF) is turned on from off
• When CH Self-tuning setting (Un\G574,
Un\G606, Un\G638, Un\G670) is set to Do
not run the ST (0)
This flag is also set to 0 (OFF) in the following
cases.
• When the self-tuning starts by changing the
set value (SV)
• When the vibration ST starts by vibration
caused by disturbance of the process value
(PV)
b1
Simultaneous
temperature rise
parameter correction
status
This flag is set to 1 (ON) when simultaneous
temperature rise parameter
*1
is corrected by
self-tuning.
b2 to b7 (fixed to 0) (Unused)
b8 Self-tuning disable status
This flag is set to 1 (ON) when the self-
tuning cannot be performed.
This flag is set to 0 (OFF) when either of the
following operation is performed.
• When the operation mode shifts to the setting
mode by turning off from on Setting/operation
mode instruction (Yn1)
• When CH Unused channel setting
(Un\G61, Un\G93, Un\G125, Un\G157) is set
to Unused (1)
• When CH PID control forced stop
instruction (YnC to YnF) is turned on from off
• When CH Self-tuning setting (Un\G574,
Un\G606, Un\G638, Un\G670) is set to Do
not run the ST (0)
This flag is also set to 0 (OFF) when all disable
conditions are released.
For disable conditions, refer to Page 229,
Section 4.18 (6).
Standard
b15 b2 b1 b0
Fixed to 0 Fixed to 0
to to
b10 b9 b8 b7
00000 000000