User Manual

High−level Instructions
3 − 769
General explanation of used memories
S1: It is recommended to specify the non−hold type area (e.g. WR) where can be operated in bit unit.
When bit0 is 1, it is auto −tuning request. This bit is reset with this instruction when auto−tuning has
completed.
Reset this bit to cancel auto−tuning.
When bit0 is 0, it is PID control.
When auto−tuning has completed successfully, 1 is set for bit 1.
Bit2 turns on to hold the output MV (S4) when the execution condition of this instruction changes from
off to on.
When bit3 is 0, it is PWM control. And when bit3 is 1, it is ANALOG output control.
When bit4 is 0, the max. value of the internal output is the output upper limit value +20% of the output
range (output upper limit value − output lower limit value), and the min. value is the output lower limit
value −20% of the output range.
When bit4 is 1, the max. value of the internal output is the output upper limit value, and the min. value
is the output lower limit value.
*The output lower limit value is specified by S4+1, and the output upper limit value is specified by
S4+2.
Bits 5 to F are reservation bits. Normally use them as 0.
S2: Area storing measured value (PV) (1 word) Effective range
The input WXn of a temperature input unit can be directly specified. k−30000 to k+30000
S3: Area to specify target value (SP) and control parameter (4 words)
It is recommended to use this area allocating to the hold−type operation
memory.
Setting range
S3: Store set value (SP). It is necessary to specify by the
instruction or an indicator.
k−30000 to k+30000
S3+1: Store proportional gain (KP).
Actual gain is Set value x 0.1.
After auto−tuning has been com-
pleted, it is automatically set.
k1 to K9999 (0.1 to
999.9)
S3+2: Store integral time (TI).
Actual integral time is Set val-
ue x 0.1.
After auto−tuning has been com-
pleted, it is automatically set.
k0 to k30000 (0 to
3000s)
S3+3: S3+3: Store derivative time
(TD).
Actual derivative time is Set
value x 0.1.
After auto−tuning has been com-
pleted, it is automatically set.
k0 to k10000 (0 to
1000s)
S4: It is divided into output (MV), specified area of control mode, auto−tuning related area and PID proc-
essing work area.
The area in the range of S4 to S4+29 is necessary for the instruction. (The detail is described herein-
below.)
It is recommended to allocate it in the non−hold area. Also, do not use the data in this area for other
purposes.
Easy usage
When PWM output in reverse operation (heating)
R0
R10
F356(EZPID), WR1, WX2, DT32710, DT100
R1
Y0
(DF)
S
Auto−tuning request
Easy PID control