Flowserve 3400IQ Digital Positioner - Manual (Page 57)

7
Logix 3400IQ Digital Positioner FCD LGENIM3402-00 – 0/07
flowserve.com
8.7 PID Function Block
PID Block Description
The PID function block provides a choice of selecting either a standard PID control equation (Ideal) or
a robust PID defined in Table 8.9 on page 59.
PID Block Parameter List
Table 8.8 lists the block parameters and default values for the PID function block.
Table 8.8 PID Control Function Block Parameters
Index Name Store Type Data Type
(Units)
Valid Range Write
Restrictions
Default Value
1 ST_REV* s Unsigned16 Read Only 0
2 TAG_DESC s Octet String All blanks
3 STRATEGY s Unsigned16 0
4 ALERT_KEY s Unsigned8 0
5 MODE_BLK Mix MODE_BLK Actual is Read
Only
Target = OOS
Permitted = OS +
MAN + AUTO+ CAS
+ RCAS + ROUT
Normal = AUTO
6 BLOCK_ERR d Bit String Read Only
7 PV D ANALOG (PV) Read Only
8 SP N ANALOG (PV) PV_SCALE,
+/- 10%
Target mode
must be AUTO,
CAS or RCAS,
not in cascade
initialization,
and tracking
cannot be
operative.
9 OUT N ANALOG
(OUT)
OUT_SCALE,
+/- 10%
Target mode
must be Man
or OOS
10 PV_SCALE S SCALING (PV) Actual mode
must be Man
or OOS
0 – 100
11 XD_SCALE S SCALING (XD) Actual mode
must be Man
or OOS
0 – 100
12 GRANT_DENY D ACCESS_
PERM_T
13 CONTROL_
OPTS
S Bit String Target mode
must be OOS
0 (reverse acting)
14 STATUS_OPTS S Bit String Target mode
must be OOS
0
15 IN N ANALOG (PV)
16 PV_FTIME S Float (seconds) 0 – 200.0 Actual mode =
Man or OOS
0
17 BYPASS S Unsigned8 1 – Off
2 – On To turn
BYPASS On,
Control Opts.
Bypass Enable
must be TRUE
0 (Un-initialized)
18 CAS_IN N ANALOG (PV)
19 SP_RATE_DN S Float (PV /
second)
Positive +INF
20 SP_RATE_UP S Float (PV /
second)
Positive +INF
21 SP_HI_LIM S Float (PV) PV_SCALE,
+/- 10%
100
22 SP_LO_LIM S Float (PV) PV_SCALE,
+/- 10%
0
23 GAIN S Float 0.0 or 0.004
– 250.0
0
24 RESET S Float (seconds) (2 • Ts) - 7500 +INF