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