LSIS XBF-AH04A

Chapter 15 PID Function (Built-in function)
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5) _PIDxx_T_d (PID xx Loop differential time)
It sets/indicates differential time of PID control of ‘xx’ th loop. The available scope is real
number. If it is set as 0 and lower, it does not execute differential control.
6) _PIDxx_d_PV_max (PV change limit)
It sets the PV change limit of ‘xx’ th loop.
For more information about PV change limit, refer to 15.2.3 PID control parameter setting. If it
is set as 0, the PV change limit function does not work.
7) _PIDxx_d_MV_max (MV change limit)
It sets the MV change limit of ‘xx’th loop. For more information about MV change limit, refer to
15.2.3 PID control parameter setting. If it is set as 0, the MV change limit function does not work.
8) _PIDxx_MV_max, _PIDxx_MV_min, _PIDxx_MV_man (max. MV, min. MV, manual MV)
It sets the max. MV, min. MV and manual MV of ‘xx’ th loop. For more information about max.
MV, min. MV and manual MV, refer to 15.2.3 PID control parameter setting. If the max. MV is
set lower than the min. MV, the PID control loop generates an error and does not work.
9) _PIDxx_PV (prevent value)
It is the area that receives the present value of ‘xx’ th PID control loop. PV is the present status
of the system to control and is normally saved into U device via input devices such as A/D input
module if it is entered from a sensor. The value is used to execute PID operation by moving to
_PIDxx_PV by means of commands like MOV.
10) _PIDxx_PV_OLD (PV of previous control cycle)
The area indicates the PV just before the xx th PID control loop. The flag, as a dedicated
monitoring flag, would be updated by PLC although a user directly enters it.
Flag name
Address
IEC type address
Unit
Scope
_PIDxx_T_d
(PID xx Loop differential time)
K1222+16*xx
%KD611+20*xx
REAL
Real number
Flag name
Address
IEC type address
Unit
Scope
_PIDxx_d_PV_max
(PV change limit)
K1224+16*xx
%KD612+20*xx
WORD
0 ~ 65,535
Flag name
Address
IEC type address
Unit
Scope
_PIDxx_d_MV_max
(MV change limit)
K1225+16*xx
%KD610+20*xx
WORD
0 ~ 65,535
Flag name
Address
IEC type address
Unit
Scope
_PIDxx_MV_max (max. MV)
K1226+16*xx
%KW1226+16*xx
INT
-32,768 ~ 32,767
_PIDxx_MV_min (min. MV)
K1227+16*xx
%KW K1227+16*xx
_PIDxx_MV_man (manual MV)
K1228+16*xx
%KW K1228+16*xx
Flag name
Address
IEC type address
Unit
Scope
_PIDxx_PV
(present value)
K1229+16*xx
%KW1229+16*xx
INT
-32,768 ~ 32,767
Flag name
Address
IEC type address
Unit
Scope
_PIDxx_PV_OLD
(PV of previous control cycle)
K1230+16*xx
%KW1230+16*xx
INT
Unavailable