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<Appendix 5. PID Block>
A5-10
IM 01S01C01-01EN
NOTE: If a control block is connected as a cascade primary
block of the PID block in question, a mode transition of
the PID block to Cas occurs in the following sequence
due to initialization of the cascade connection: RCas or
ROut → Auto → Cas.
A5.18 Alarms
There are two kinds of alarms generated by a PID
block: block and process alarms.
A5.18.1 Block Alarm (BLOCK_ALM)
The block alarm BLOCK_ALM is generated upon
occurrence of either of the following errors (values
set in BLOCK_ERR) and noties the content of
BLOCK_ERR.
Value of
BLOCK_ERR
Condition
Local Override MODE_BLK actual of PID block is LO.
Input Failure IN.status of the PID block is either of
the following:
• Bad-Device Failure
• Bad-Sensor Failure
Out of Service MODE_BLK.target of the PID block is
O/S.
A5.18.2 Process Alarms
There are six types of process alarms. Priority level
can be set to process alarms. The priority level is
set for each process alarm type.
Process
Alarm
Cause of Occurrence
Parameter
Containing
Priority Level
Setting
HI_HI_ALM Occurs when the PV
increases above the
HI_HI_LIM value.
HI_HI_PRI
HI_ALM Occurs when the PV
increases above HI_LIM
value.
HI_PRI
LO_ALM Occurs when the PV
decreases below the
LO_LIM value.
LO_PRI
LO_LO_
ALM
Occurs when the PV
decreases below the
LO_LO_LIM value.
LO_LO_LIM
DV_HI_ALM Occurs when the value of
[PV - SP] increases above
the DV_HI_LIM value.
DV_HI_PRI
DV_LO_
ALM
Occurs when the value
of [PV - SP] decreases
below the DV_LO_LIM
value.
DV_LO_PRI
A5.19 Example of Block
Connections
PID
BKCAL_IN OUT
IN
AO
BKCAL_OUT
CAS_IN
AI
OUT
FA0506.ai
When conguring a simple PID control loop by
combining an eld device with a eldbus valve
positioner that contains an AO block, follow the
procedure below to make the settings of the
corresponding eldbus function blocks:
1. Connect the AI block and PID block of the eld
device, and the AO block of the valve positioner
as shown above.
2. Set MODE_BLK.target of the PID block to
O/S, and then set GAIN, RESET, and RATE to
appropriate values.
3. Check that the value of MODE_BLK.actual of
the AI block is Auto.
4. Set MODE_BLK.target of the AO block to
CAS|AUTO (meaning "Cas and Auto").
5. Check that the value of BKCAL_IN.status of the
PID block is not Bad.
6. Check that the value of IN.status of the PID
block is not Bad.
7. Check that Auto is set in MODE_BLK.permitted
of the PID block.
8. Set MODE_BLK.target of the PID block to Auto.
When nishing all steps in order, the PID block and
AO block exchange the respective information and
initialize the cascade connection. Consequently,
the value of MODE_BLK.actual of the PID block
changes to Auto and automatic PID control starts.
- Fieldbus Segment Indicator 1
- Contents 2
- 1. Introduction 8
- 1.2 Warranty 9
- 1.3 ATEX Documentation 10
- 2. Handling Cautions 11
- Protected Instrument 13
- Terminal 15
- 2.8.2 CSA Certication 17
- Location of the mark 22
- 2) Internal grounding 22
- 1) External grounding 22
- 2.8.4 IECEx Certication 23
- 3. Component Names 25
- 4. About Fieldbus 26
- 5. Installation 28
- 5.3 Wiring 29
- 5.4 Grounding 30
- 5.5 Connection of Devices 30
- 5.6 Host Setting 31
- 5.7 Bus Power ON 32
- 6. Conguration 34
- 6.2 Network Denition 35
- 6.3 Denition of Combining 36
- Function Blocks 36
- 6.4 Setting of Tags and 37
- Addresses 37
- 6.5 Communication Setting 37
- 0x1: System/network 38
- 0x1234: Function block 38
- 6.6 Block Setting 39
- 6.6.2 Trend Object 40
- 6.6.3 View Object 40
- <6. Conguration> 41
- 7.3.2 Operating mode 44
- 7.3.1 Function Outline 44
- Quality Sub-status 46
- 7.3.5 Indicator settings 47
- Figure 7.4 Sub Tag settings 48
- (switching displays) 62
- 9. In-Process Operation 64
- 9.3 Device Diagnostic 67
- Simulation Function 67
- 10. Maintenance 69
- Assembly 70
- 11. Device Information 71
- 12. Parameter Lists 74
- 12.2 LCD Transducer Block 77
- 13. General Specications 85
- 13.2 Physical Specications 86
- 13.3 Model and Sufx Codes 86
- 13.5 Optional Specications 88
- 13.6 Dimensions 89
- A1.1 Schematic Diagram of 90
- Signal Characterizer Block 90
- A1.2 Input Section 91
- FA0103.ai 92
- A1.5.1 Input Compensation 95
- A1.5.3 Backward Control 96
- Figure A2.1 Integrator Block 97
- A2.2 Input Process Section 98
- A2.3 Adder 99
- A2.4 Integrator 100
- A2.5 Output Process 101
- IM 01S01C01-01EN 102
- A2.6 Reset 103
- A2.6.2 Reset Timing 104
- A2.6.3 Reset Process 104
- Figure A3.1 IS Block 108
- A3.2 Input Section 110
- A3.2.2 MIN_GOOD Handling 111
- A3.3 Selection 112
- A3.3.2 SELECTION Handling 113
- Figure A3.5 Example (4) 114
- Figure A3.6 Example (5) 115
- Figure A3.7 Example (6) 116
- Figure A3.8 Example (7) 117
- Figure A3.9 Example (8) 118
- A3.4 Output Processing 119
- A3.4.2 OUT Processing 120
- A3.4.3 STATUS_OPTS 121
- FA0311.ai 123
- A4.2 Input Section 125
- A4.2.3 INPUT_OPTS 126
- Inputs and PV 126
- A4.3 ComputationSection 127
- A4.4 OutputSection 127
- AUTO MAN AUTO 128
- BAL_TIME 128
- Appendix 5. PID Block 132
- A5.3 Parameters of PID Block 133
- A5.4 PID Computation Details 136
- A5.5 Control Output 136
- A5.7 Control Action Bypass 137
- A5.8 Feed-forward 137
- A5.9 Block Modes 137
- A5.10 Bumpless Transfer 138
- A5.11 Setpoint Limiters 138
- Fallback (IMan) 139
- A5.15 Manual Fallback 140
- A5.16 Auto Fallback 140
- A5.17 Mode Shedding upon 140
- Computer Failure 140
- A5.18 Alarms 141
- A5.19 Example of Block 141
- Connections 141
- A5.20 View Object for PID 142
- Function Block 142
- (MAO) Block 143
- A6.2 Block Mode 144
- A6.3 Fault State 145
- A6.4 Status Transitions 146
- A6.5 Parameter list display 146
- A7.1 Link Active Scheduler 148
- A7.2 Link Master 148
- A7.3 Transfer of LAS 149
- A7.4 LM Functions 150
- A7.5 LM Parameters 151
- SCHEDULE_LIST_ 152
- CHARACTERISTICS_ 152
- A7.6 FAQs 155
- Field Device 159
- A8.7 Troubleshooting 159
- Software Download 161
- Relating to Software Download 162
- IMPORTANT 162
- (3) DOMAIN_HEADER 163
- Revision Information 164
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