Edit content
1. The meaning of each data item in the function block:
PID function block:
SH: the upper limit of the range.
SL: lower limit of measuring range
PV: Process measurement
Sampled: process given value
MV: output value
DV: deviation (PV-SV)
SUM: the cumulative value.
OPHI: output high limit pointer
OPLO: output low limit pointer
Note: In normal operation, OPHI and OPLO can be used to mark the allowable range of manual operation, which plays the role of Operation Guide.
MSH: the highest limit of the MV value. (MSH can only be changed in the configuration)
MSL: the minimum value of the MV. (MSL can only be changed in the configuration)
HH: input height limit.
PH: input high limit
PL: input low limit.
LL: input low limit.
VL: The rate alarm setting value.
DL: deviation alarm setting value.
Set the value limit function. When the function block is in the AUT or MAN state, a dialog box appears if the operator tries to give a value that exceeds SVH or is lower than SVL, it can't be changed until the operator confirms it.
SVH: the upper limit of the given value.
SVL: the lower limit of the given value.
Nic: the highest limit of the MV value.
ML: The low limit site of the MV value.
The limit only works in the automatic and Cascade mode. It does not work in the state of manual and tracking.
P: Proportional band
I: point time
D: differential time
GW: gap width (the function of nonlinear gain is to change the proportional band gain according to the PV-SV. This is usually used in the occasion where a small input change requires a large output)
DB: dead band action (PV-SV) (DV-HYS
CK: I/O compensation gain. (The default value is 1)
CB: I/O compensation offset. (The default value is 0)
PMV: Prset manipulated-output value. Default value. (
The function is to use an internal command to manually type the PID function block and force the output of the default value of the MV.
It is usually realized by PSW preset value switch.
PMV=1. MV=MSH
PMV=2. MV=MSL
PMV=3.MV=PMV.
2. Process alarm: in the process of instrument detection and control, if there is any abnormal situation, the corresponding alarm will be issued.
L Ural: return to normal
L IOP: Enter high open circuit (1000. Default value + 106.3)
L IOP-: enter low Circuit (-1000, default value:-6.3%)
Reason:
1. Input open circuit detected
2. I/O module is broken.
3. The block is not scanned (O/S)
4. Data exceeds the upper and lower limit.
5. Communication data failure.
L HH, LL: input high or low alarm
HH, the normal recovery conditions after the LL alarm is generated: HH: PV <= HH-HYS (2.0%), LL: PV> = LL + HYS (2.0%)
The HH value is the same as the measuring range. There is no HH value. The LL value is the same as the lower limit of the measuring range, so there is no LL value.
HI, LO: input high or low alarm
Recovery conditions after HI, LO alarm is generated: HH: PV <= PH-HYS (2.0%), LL: PV> = PL + HYS (2.0%)
The HI value is the same as the measuring range, and there is no HH value. The LO value is the same as the lower limit of the measuring range, so there is no LL value.
VEL + VEL-: input change rate alarm
DV + DV-: error alarm. DV=PV-SV
OOP: output open circuit alarm
Reason:
1. Output open circuit detected
2. I/O module is broken.
3. The block is not scanned (O/S)
If OOP is detected, the control block is switched to manual mode, and the MV is frozen before the open circuit.
MHI, MLO: output high-limit or low-limit alarms.
The limit only works in the automatic and Cascade mode. It does not work in the state of manual and tracking.
Switch instrument;
If the MV is equal to 2 and the PV is not equal to 2, an open-side alarm is sent, ANS +
If the MV is equal to 0 and the PV is not equal to 0, the off-side alarm ANS-
PERR alarm: abnormal status.
Example
Detection time MTM, default value: 4S.
Response bypass function:
Response bypass function can stop the response signal input function and response signal detection function, and force PV to be equal to MV. Method: BPSW = 1 or 3. Default value: 0.
SIMM: simulation status.
Instrument mode:
O/S: OUT OF SERVICE
IMAN: initialize the manual state (for example, FIC103, FIC102, FIC1044, and FIC701)
SS-H: 0, keep the selected signal value. 1. Select 1st signals. 2. Choose 2nd signals, 3. Choose 3rd Signals, 4. Choose automatically.
MAN: manual adjustment
AUT: automatic adjustment, CAS: Cascade adjustment
