The PID Controller Block can perform the following two types of control action by bypassing proportional and/or derivative actions among the proportional, integral and derivative actions:
Table 1.5-4 Control Action Bypass
Control actions bypassed Control actions after bypassing Set parameter setpoint
Derivative (D) Proportional (P)+integral (I) P≠0, D=0 Proportional (P), derivative (D) Integral (I) P=0
To set the control action bypass, specify “0” to the set parameter P or D, as shown in the table above. The proportional gain (Kp) is fixed to “1” when only integral action is required.
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Data Items - PID
Table 1.5-5 Data Items of PID Controller Block (PID) (1/2)
Data Item Data Name Entry Permittedor Not (*1) Range (*2) Default (*2)
MODE Block mode x --- O/S (MAN)
ALRM Alarm status --- NR
AFLS Alarm flashing status --- 0 AF Alarm detection specifica-tion --- 0 AOFS Alarm masking specifica-tion --- 0 PV Process variable Δ (*3) PV engineering unit value SL RAW Raw input data Value in the unit at the con-nection destination --- SUM Totalizer value x Engineering unit value 0 SV Setpoint value Δ (*4) Value in the same engi-neering unit as PV SL CSV Cascade setpoint value x Value in the same engi-neering unit as PV SL RSV Remote setpoint value Δ (*5) Value in the same engi-neering unit as PV SL DV Control deviation value Value in the same engi-neering unit as PV 0 VN I/O compensation value x --- 0 MV Manipulated output value Δ (*6) MV engineering unit value MSL RMV Remote manipulated outputvalue Δ (*7) Value in the same engi-neering unit as MV MSL RLV1 Reset limit value 1 Value in the same engi-neering unit as MV MSL RLV2 Reset limit value 2 Value in the same engi-neering unit as MV MSL HH High - high limit alarm set-point x SL to SH SH LL Low - low limit alarm set-point x SL to SH SL PH High - limit alarm setpoint x SL to SH SH
Data Item Data Name Entry Permittedor Not (*1) Range (*2) Default (*2)
PL Low - limit alarm setpoint x SL to SH SL VL Velocity alarm setpoint x ± (SH - SL) SH - SL PVP Velocity-Reference Sample Value in the same engi-neering unit as PV --- DL Deviation alarm setpoint x ± (SH - SL) SH - SL *1: x: Entry is permitted unconditionally
Blank: Entry is not permitted Δ: Entry is permitted conditionally *2: SH: PV scale high limit
SL: PV scale low limit MSL: MV scale low limit
*3: Entry is permitted when the data status is CAL *4: Entry is permitted when the data mode is CAS or RCAS *5: Entry is permitted when the block mode is RCAS *6: Entry is permitted when the block mode is MAN *7: Entry is permitted when the block mode is ROUT
Table 1.5-6 Data Items of PID Controller Block (PID) (2/2)
Data Item Data Name Entry Permittedor Not (*1) Range (*2) Default (*2)
MH Manipulated variable high-limit setpoint x MSL to MSH MSH ML Manipulated variable low-limit setpoint x MSL to MSH MSL SVH Setpoint high limit x SL to SH SH SVL Setpoint low limit x SL to SH SL P Proportional band x 0 to 1000 % 100 % I Integral time x 0.1 to 10,000 seconds 20 seconds D Derivative time x 0 to 10,000 seconds 0 second GW Gap width x 0 to (SH - SL) 0.0 DB Deadband x 0 to (SH - SL) 0.0 CK Compensation gain x -10.000 to 10.000 1.000 CB Compensation bias x --- 0.000 PMV Preset manipulated outputvalue x MSL to MSH MSL TSW Tracking switch x 0, 1 0
CSW Control switch x 0, 1 0
PSW Preset MV switch x 0, 1, 2, 3 0 RSW Pulse width reset switch x 0, 1 0
BSW Backup switch x 0, 1 0
OPHI Output high-limit index x MSL to MSH MSH OPLO Output low-limit index x MSL to MSH MSL OPMK Operation mark x 0 to 64 0 UAID User application ID x --- 0 SH PV scale high limit Value in the same engi-neering unit as PV --- SL PV scale low limit Value in the same engi-neering unit as PV --- MSH MV scale high limit Value in the same engi-neering unit as MV ---
Data Item Data Name Entry Permittedor Not (*1) Range (*2) Default (*2)
MSL MV scale low limit Value in the same engi-neering unit as MV --- *1: x: Entry is permitted unconditionally
Blank: Entry is not permitted *2: SH: PV scale high limit
SL: PV scale low limit MSH: MV scale high limit MSL: MV scale low limit SEE
ALSO For more information about valid block modes of the PID block, refer to:
1.6
Sampling PI Controller Block (PI-HLD)
Sampling PI Controller Block (PI-HLD) stops after performing each control action and waits for the result to come out. This block may be used to control processes with a long dead time or for the control that relies on the data from sampling unit of analyzers.
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Sampling PI Controller Block (PI-HLD)
▼ Connection
The figure below shows a function block diagram of Sampling PI Controller Block (PI-HLD):
RMV SV CAS/AUT MAN INT TSI TIN RL2 BIN RL1 IN OUT (TSW) (RLV2) (RLV1) (VN) (PV, ∆PV, MV, ∆MV) SUB RSV CSV CAS AUT MAN RCAS SET MV PV computationControl processing Output processing Input processing ROUT
Figure 1.6-1 Function Block Diagram of Sampling PI Controller Block (PI-HLD)
The table below shows the connection methods and connected destinations of the I/O termi- nals of the Sampling PI Controller Block (PI-HLD):
Table 1.6-1 Connection Methods and Connected destinations of the I/O Terminals of Sampling PI Con- troller Block (PI-HLD)
I/O terminal
Connection method(*1) Connection destination(*1)
Data refer-
ence Data set-ting connection Process I/OTerminal SoftwareI/O Functionblock
IN Measure-ment input x Δ x x
SET Setting in-put x x
OUT Manipu-lated output x x x x
SUB Auxiliaryoutput x Δ x x
RL1 Reset sig-nal 1 input x Δ x x RL2 Reset sig-nal 2 input x Δ x x BIN Compensa-tion input x Δ x x TIN Trackingsignal input x Δ x x TSI TrackingSW input x Δ x x x
I/O terminal
Connection method(*1) Connection destination(*1)
Data refer-
ence Data set-ting connection Process I/OTerminal SoftwareI/O Functionblock
INT InterlockSW input x Δ x x x *1: x: Connection allowed
Blank: Connectio not allowed
Δ: Connection allowed only when connecting to a switch block (SW-33, SW-91) or inter-station data link block (ADL).
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Function of Sampling PI Controller Block (PI-HLD)
The PI-HLD block performs input processing, control computation processing, output pro- cessing, and alarm processing.
The only processing timing available for the PI-HLD block is a periodic startup. Selections available for the scan period used to execute a periodic startup include the basic scan peri- od, the medium-speed scan period (*1), and the high-speed scan period.
*1: The medium-speed scan period can only be used for the FFCS series, KFCS2, KFCS, LFCS2, and LFCS. SEE
ALSO For more information about the types of input processing, output processing, and alarm processing possible
for the PI-HLD block, refer to:
1.1.3, “Input Processing, Output Processing, and Alarm Processing Possible for Each Regulatory Con- trol Block” on page 1-12
For more information about the input processing, refer to:
3, “Input Processing” in the Function Blocks Overview (IM 33K03E21-50E) For more information about the output processing, refer to:
4, “Output Processing” in the Function Blocks Overview (IM 33K03E21-50E) For more information about the alarm processing, refer to:
5, “Alarm Processing-FCS” in the Function Blocks Overview (IM 33K03E21-50E)