Pid block – Fluid Components International ST100 Series Foundation Fieldbus User Manual
Page 22
ST100 Series Foundation Fieldbus
20
Fluid Components International LLC
PID Block
This block offers control algorithms that use the Proportional, Integral and Derivative terms. The algorithm is non-iterative or ISA. In this algorithm
the GAIN is applied to all terms of the PID, and the proportional and the integral actuate over the error, and the derivative actuates over the PV value.
ST100 PID Block
INDEX
PARAMETER
DATA TYPE (LENGTH)
INITIAL VALUE
DESCRIPTION
1
ST_REV
Unsigned16
0
2
TAG_DESC
OctString(32)
Blanks
3
STRATEGY
Unsigned16
0
4
ALERT_KEY
Unsigned8
0
5
MODE_BLK
DS-69
OOS
6
BLOCK_ERR
Bitstring(2)
7
PV
DS-65
Bad ns 0
ns = non specific
8
SP
DS-65
G C/0
G C/0 = GOOD_CAS/0
9
OUT
DS-65
BOS
BOS = BAD_Out of service 0
10
PV_SCALE
DS-68
0-100%
11
OUT_SCALE
DS-68
0-100%
12
GRANT_DENY
DS-70
0,0
13
CONTROL_OPTS
Bitstring(2)
0
14
STATUS_OPTS
Bitstring(2)
0
15
IN
DS-65
BNc
BNc= Bad-Not connected 0
16
PV_FTIME
Float
0
17
BYPASS
Unsigned8
Unititialized
18
CAS_IN
DS-65
BNc
BNc= Bad-Not connected 0
19
SP_RATE_DN
Float
+INF
20
SP_RATE_UP
Float
+INF
21
SP_HI_LIM
Float
100
22
SP_LO_LIM
Float
0
23
GAIN
Float
0
24
RESET
Float
+INF
25
BAL_TIME
Float
0
26
RATE
Float
0
27
BKCAL_IN
DS-65
BNc
BNc = Bad_Not connected /0
28
OUT_HI_LIM
Float
100
29
OUT_LO_LIM
Float
0
30
BKCAL_HYS
Float
0.5%
31
BKCAL_OUT
DS-65
BNs0
BNs0 = Bad-Non Specific 0
32
RCAS_IN
DS-65
Bos0
Bos0=Bad-Out of Service/0
33
ROUT_IN
DS-65
Bos0
Bos0=Bad-Out of Service/0
34
SHED_OPT
Unsigned8
Uninitialized
35
RCAS_OUT
DS-65
BNs0
BNs0 = Bad-Non Specific 0
36
ROUT_OUT
DS-65
BNs0
BNs0 = Bad-Non Specific 0
37
TRK_SCALE
DS-68
0-100%