A8.3 Parameters Of Pid Block - YOKOGAWA digitalYEWFLO Series User Manual

A8.3 Parameters of PID Block

NOTE: In the table below, the Write column shows the modes in which the respective parameters can be
written. A blank in the Write column indicates that the corresponding parameter can be written in all modes of
the PID block. A dash (–) indicates that the corresponding parameter cannot be written in any mode.
Index Parameter Name
(factory setting)
0 Block Header TAG: "PID"
1 ST_REV
2 TAG_DESC
3 STRATEGY
4 ALERT_KEY
5 MODE_BLK
6 BLOCK_ERR
7 PV
8 SP
9 OUT
10 PV_SCALE
11 OUT_SCALE
12 GRANT_DENY
13 CONTROL_OPTS
14 STATUS_OPTS
15 IN
16 PV_FTIME
17 BYPASS
18 CAS_IN
19 SP_RATE_DN
20 SP_RATE_UP
21 SP_HI_LIM
22 SP_LO_LIM
23 GAIN
24 RESET
25 BAL_TIME
26 RATE
27 BKCAL_IN
28 OUT_HI_LIM
29 OUT_LO_LIM
30 BKCAL_HYS
31 BKCAL_OUT
32 RCAS_IN
33 ROUT_IN
34 SHED_OPT
35 RCAS_OUT
Default
Write Valid Range
Block Tag
= O/S
–
(blank)
0
1 1 to 255
–
–
0 AUTO PV_SCALE ±10%
MAN
100 O/S
0
1342 (%)
1
100 O/S
0
1342 (%)
1
0 AUTO
0 O/S
0 O/S
0
0sec AUTO Non-negative
1 (off) MAN 1, 2
0
1.#INF Positive
1.#INF Positive
100 PV_SCALE ±10%
0 PV_SCALE ±10%
1
10
0 Positive
0 Positive
0
100 OUT_SCALE ±10% Upper limit for control output (OUT)
0 OUT_SCALE ±10% Lower limit for control output (OUT)
0.5 (%) 0 to 50%
0 –
0
0
0
0 –
<APPENDIX 8. PID BLOCK>
Description
Same as that for an AI block.
Same as that for an AI block.
Same as that for an AI block.
Same as that for an AI block.
Same as that for an AI block.
Same as that for an AI block.
Measured value; the non-dimensional value that is
converted from the input (IN) value based on the PV_
SCALE values and filtered.
Setpoint
Output
Upper and lower scale limit values used for scaling of the
input (IN) value.
Upper and lower scale limit values used for scaling of the
control output (OUT) value to the values in the engineering
unit.
Same as that for an AI block.
Setting for control action. Read APPENDIX 8.13 "Measured-
value Tracking" for details.
Read APPENDIX 8.15 "Manual Fallback" for details.
Controlled-value input
Time constant (in seconds) of the first-order lag filter applied
to IN
Whether to bypass the control computation.
1 (off): Do not bypass.
2 (on): Bypass.
Cascade setpoint
Rate-of-decrease limit for setpoint (SP)
Rate-of-increase limit for setpoint (SP)
Upper limit for setpoint (SP)
Lower limit for setpoint (SP)
Proportional gain (= 100 / proportional band)
Integration time (seconds)
Unused
Derivative time (seconds)
Read-back of control output
Hysteresis for release from a limit for OUT.status
Read-back value to be sent to the BKCAL_IN in the upper
block
Remote setpoint set from a computer, etc.
Remote control output value set from a computer, etc.
Action to be performed in the event of mode shedding.
SHED_OPT defines the changes to be made to MODE.
BLK.target and MODE.BLK.actual when the value of
RCAS_IN.status or ROUT_IN.status becomes Bad if
MODE_BLK.actual = RCas or ROut.
Read APPENDIX 8.17 "Mode Shedding upon Computer
Failure."
Remote setpoint sent to a computer, etc.
A8-2
IM 01F06F00-01EN