Yokogawa AXFA14G/C Instrukcja Użytkownika Strona 95
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Oceniono. / 5. Na podstawie oceny klientów
IM 01E20F02-01E
A-36
APPENDIX 5. PID Block
A5.8 Feed-forward
Feed-forward is an action to add a compensation output
signal FF_VAL to the output of the PID control
computation, and is typically used for feed-forward
control. The figure below illustrates the action.
PID
computation
FF_SCALE
OUT_SCALE
PV OUT
FF_VAL
FF_GAIN
FA0103.EPS
A5.9 Block Modes
The block mode is set in the parameter MODE-BLK.
Stipulates the target mode to which the
PID block transfers.
Indicates the current mode of the PID
block.
Stipulates all the modes that the PID
block can enter. The PID block is
prohibited to enter any mode other than
those set in this element.
Stipulates the mode in which the PID
block normally resides.
MODE_
BLK
Target
Actual
Permitted
Normal
TA0105.EPS
There are eight modes for a PID block as shown
below.
Block
Mode
Description
Remote output mode, in which the PID block outputs
the value set in ROUT_IN.
Remote cascade mode, in which the PID block
carries out the PID control computation based on the
setpoint (SP) set via the remote cascade connection,
such as from a computer, and outputs the computed
result.
Cascade mode, in which the PID block carries out the
PID control computation based on the setpoint (SP)
set from another fieldbus function block, and outputs
the computed result.
The PID block carries out automatic control and
outputs the result computed by the PID control
computation.
Manual mode, in which the PID block outputs the
value set by the user manually.
The PID block outputs the value set in TRK_VAL.
ROut
RCas
Cas
Auto
Man
LO
TA 0106-1.EPS
Block
Mode
Description
Initialization and manual mode, in which the control
action is suspended. The PID block enters this mode
when the specified condition is met
(see Section A5.14).
Out of service mode, in which neither the control
computation nor action is carried out, and the output
is kept at the value that was output before the PID
block entered into O/S mode.
IMan
O/S
TA 0106-2.EPS
A5.9.1 Mode Transitions
Transition
Destination
Mode
Condition
NOT
Conditions
1. If O/S is set in MODE_
BLK.target (or if O/S is set in
target inside the resource
block)
2. If the specified condition is
met (see Section A5.14)
3. If Track Enable is specified in
CONTROL_OPTS and the
value of TRK_IN_D is true
4. If Man is set in MODE_
BLK.target or if IN.status
(input status) is Bad
5. If Auto is set in MODE_
BLK.target
- AND -
if IN.status (input status) is
not Bad
6. If Cas is set in MODE_
BLK.target
- AND -
if neither IN.status (input
status) nor CAS_IN.status is
Bad.
7. If RCas is set in MODE_
BLK.target
- AND -
if neither IN.status (input
status) nor RCAS_IN.status
is Bad.
8. If ROut is set in MODE_
BLK.target
- AND -
if ROUT_IN.status (input
status) is not Bad
9. If RCAS_IN.status or ROUT_
IN.status is Bad (indicating a
computer failure; see Section
A5.17.1 for details)
NOT if
condition 1
is met
NOT if either
or both of
conditions 1
and 2 are met
NOT if any
one or more
of conditions 1
to 3 are met
NOT if any
one or more
of conditions 1
to 3 are met
NOT if any
one or more
of conditions 1
to 3 are met
NOT if any
one or more
of conditions 1
to 3 are met.
NOT if any
one or more
of conditions 1
to 3 are met.
O/S
IMan
LO
Man
Auto*
Cas*
,
**
RCas*
,
**
ROut*
,
**
In accordance
with the
SHED_OPT
setting
TA 0107.EPS
* To activate mode transitions to Auto, Cas, RCas,
and ROut, the respective target modes must be set
beforehand to MODE_BLK.permitted.
** A transition to Cas, RCas, or ROut requires that
initialization of the cascade connection has been
completed.
- ADMAG AXF Series 1
- Fieldbus Communication Type 1
- Magnetic Flowmeter 1
- CONTENTS 2
- 1. INTRODUCTION 6
- 1.1 Safe Use of This Product 7
- 1.2 Warranty 8
- 1.3 Combination Remote 8
- Flowtubes 8
- 2. ABOUT FIELDBUS 9
- 2. ABOUT FIELDBUS 10
- 3. GETTING STARTED 11
- 3.2 Host Setting 12
- 3.3 Bus Power ON 13
- 3.4 Integration of DD 13
- 3.5 Reading the Parameters 13
- 3.7 Generation of Alarm 14
- 4. CONFIGURATION 15
- 4.3 Definition of Combining 16
- Function Blocks 16
- 4.4 Setting of Tags and 17
- Addresses 17
- 4.5 Communication Setting 18
- 4.6 Block Setting 19
- 4.6.3 View Object 20
- 4.6.2 Trend Object 20
- T0411-2.EPS 21
- 4. CONFIGURATION 22
- T0417.EPS 24
- IM 01E20F02-01E 25
- 5. EXPLANATION OF BASIC ITEMS 26
- AI Function Block Parameters 29
- T0503.eps 30
- Table 5.4.1 Unit Codes 31
- Table 5.5.1 Alarm Priority 32
- 5.6 Integral LCD Indicator 33
- F0510.eps 34
- F0518.eps 35
- Alarm generated 36
- F0519.eps 36
- Warning Display 37
- Data display 37
- F0520.eps 38
- T0516.eps 38
- 6.1 Mode Transition 39
- 6.2 Generation of Alarm 39
- 6.3 Simulation Function 40
- 7. DEVICE INFORMATION 41
- 7. DEVICE INFORMATION 42
- T0707-1.EPS 43
- Not used 43
- Table 7.9 Alarm Summary 44
- 8. PARAMETER LISTS 45
- 8. PARAMETER LISTS 46
- T0801-3.EPS 47
- 8.2 Transducer Block 48
- T0802-5.EPS 52
- 8.3 AI Function Block 53
- 8.4 Dl Function Block 55
- 9. GENERAL SPECIFICATIONS 56
- 9.2 OPTIONAL SPECIFICATIONS 57
- 9.3 TERMINAL CONNECTION 58
- 10. MAINTENANCE 59
- CHANGE OF BASIC PARAMETERS 60
- IMPORTANT 61
- FA0105.EPS 62
- Reset "1" 64
- FA0201.EPS 65
- A2.2 Input Process Section 66
- FA0203.EPS 67
- A2.3.2 Addition 68
- TA0203.EPS 69
- Uncertain 70
- Counting up starting from 0 71
- A2.6 Reset 72
- Figure A3.1 AR Block 76
- A3.2 Input Section 77
- A3.2.3 INPUT_OPTS 78
- Inputs and PV 78
- A3.3 Computation Section 79
- A3.4 Output Section 79
- A3.4.1 Mode Handling 80
- A3.4.2 Status Handling 80
- A4.1 Link Active Scheduler 83
- A4.2 Link Master 83
- A4.3 Transfer of LAS 84
- TA 0404.EPS 85
- TA0405-1.EPS 86
- TA0405-2.EPS 87
- TA 0406.EPS 88
- TA0413.EPS 89
- A4.6 FAQs 90
- APPENDIX 5. PID BLOCK 91
- A5.3 Parameters of PID Block 92
- A5.4 PID Computation Details 94
- A5.5 Control Output 94
- A5.7 Control Action Bypass 94
- A5.8 Feed-forward 95
- A5.9 Block Modes 95
- A5.10 Bumpless Transfer 96
- A5.11 Setpoint Limiters 96
- A5.13 Measured-value Tracking 96
- TA 0108.EPS 97
- A5.17 Mode Shedding upon 98
- Computer Failure 98
- A5.18 Alarms 98
- A5.19 Example of Block 99
- Connections 99
- A5.20 View Object for PID 99
- Function Block 99
- APPENDIX 5. PID Block 100
- A6.2 Specifications 101
- Downloading 101
- A6.4 Software Download Se 102
- TA 0101.EPS 103
- TA0103.EPS 104
- APPENDIX 6. SOFTWARE DOWNLOAD 105
- TA0108.EPS 106
- Relating to Software Download 107
- (2) DOMAIN_DESCRIPTOR 108
- (3) DOMAIN_HEADER 108
- TA0111.EPS 108
- REVISION RECORD 109
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