Mitsubishi Electric MELSEC iQ-R Series Programming Manual page 316

Processing details
■PV start
At the start of a control (when the AUT mode is switched), this function block reduces a gap with process variable by referring
to the process variable and adjusting the control start point. The adjusted control start point is set as the start point (current)
(SV0C).
PV start type
PVSTART = 0
PVSTART = 1
PVSTART = 2
• (1) When the number of steps (STNO) is 0
Because the step setting is invalid, the control mode will be immediately switched to the MAN mode, if the mode has been
switched to the AUT mode, and the pattern completion output (PTNEND) will turn on by only one cycle. The system operates
in the MAN mode, and the FB multi-link function and inverse engineering value conversion are activated.
• (2) SV0 start (Fixed start point: PVSTART = 0)
The control will start using the start point (SV0) as the control start point without referring to the process variable.
Setting value (SV)
Starts from SV0.
SV0
T1_ T2_
• (3) PV start 1 (Start point correction: PVSTART = 1)
The control will start using the process variable as the control start point.
Setting value (SV)
Starts from PV value.
PV input value
SV0
T1_
10 LOOP CONTROL OPERATION
314
10.25 Multi-Point Program Setter (M+P_PGS2_)
Control start condition
STNO  0
STNO = 0
STC = 0 and T_ = 0
(1) SV0 start (2)
PV start 1 (3)
PV start 2 (4)
T3_ T4_ T5_
T2_ T3_ T4_
STC = 0 and T_  0
(5)
Time (T_)
Time (T_)
T5_
STC  0
After the second
cycle at cyclic
(6) (7)