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BSI PD IEC/PAS 63131:2017:2018 Edition

BSI PD IEC/PAS 63131:2017:2018 Edition

$215.11

System control diagram

Published By Publication Date Number of Pages
BSI 2018 244
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This PAS is intended to cover functional as well as drawing related requirements for use of SCDs.

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PDF Pages PDF Title
2 undefined
4 CONTENTS
13 FOREWORD
15 INTRODUCTION
18 1 Scope
2 Normative references
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
23 3.2 Abbreviated terms
24 4 The system control diagram (SCD) approach
4.1 Conceptual definition
25 4.2 Framework
4.3 Life cycle concept
Figures
Figure 1 โ€“ SCD framework
26 4.4 Basic design (informative)
4.4.1 General
4.4.2 Basic system design
Figure 2 โ€“ Basic design
27 4.4.3 Basic function design
4.4.4 Basic application design
Figure 3 โ€“ Basic system design
Figure 4 โ€“ Basic function design
28 4.4.5 Application design
Figure 5 โ€“ Basic application design, application typical
Figure 6 โ€“ Object typical
29 4.5 Alarm management
Figure 7 โ€“ Object typical
30 Annex A (normative) System control diagram (SCD) function standard
A.1 Overview
A.1.1 General
A.1.2 Compliance
A.1.3 Positive logic
A.1.4 Execution sequence of logic
A.1.5 Functions used in SIF
31 A.1.6 HMI presentation
A.2 Terminal codes
A.2.1 General
32 A.2.2 Signal types (1.Character)
Tables
Table A.1 โ€“ Terminal codes identification letters
33 A.2.3 Explanatory code (succeeding characters)
A.2.4 Terminal description for function templates
34 Table A.2 โ€“ Terminal codes
37 A.3 SCD control function template behaviour
A.4 Function templates
A.4.1 General
38 A.4.2 Function template name convention
39 Table A.3 โ€“ Function template letter identification
40 Table A.4 โ€“ List of function templates described in this annex
41 Figure A.1 โ€“ Typical function template schematic
42 A.4.3 CA โ€“ PID controller
Figure A.2 โ€“ CA function template schematic
49 A.4.4 CS โ€“ Step control
50 Figure A.3 โ€“ CS function template schematic
55 A.4.5 HA โ€“ Analogue input command
Figure A.4 โ€“ HA function template schematic
57 A.4.6 HB โ€“ Binary input command
Figure A.5 โ€“ HB function template schematic l
59 A.4.7 KB โ€“ Sequence logic interface template
Figure A.6 โ€“ KB function template schematic
61 A.4.8 LB โ€“ Safeguarding shutdown level
62 Figure A.7 โ€“ LB function template schematic
64 A.4.9 MA โ€“ Monitoring of analogue process variables
Figure A.8 โ€“ MA function template schematic
68 A.4.10 MAS โ€“ Analogue measurement acquisition from subsystems
69 Figure A.9 โ€“ MAS function template schematic
71 A.4.11 MB โ€“ Monitoring of binary (digital) process variables
Figure A.10 โ€“ MB function template schematic
73 A.4.12 OA โ€“ Analogue output
74 Figure A.11 โ€“ OA function template schematic
79 A.4.13 QA โ€“ Totalizer
80 Figure A.12 โ€“ A function template schematic
83 A.4.14 SB โ€“ Single binary signal for shutdown
Figure A.13 โ€“ SB function template schematic
85 A.4.15 SBB โ€“ Breaker control template
86 Figure A.14 โ€“ SBB function template schematic
91 A.4.16 SBC โ€“ Coordinator for SBE
92 Figure A.15 โ€“ SBC function template schematic
96 A.4.17 SBE โ€“ Control of electrical equipment
97 Figure A.16 โ€“ SBE function template schematic
102 A.4.18 SBV โ€“ Control of pneumatic/hydraulic equipment
103 Figure A.17 โ€“ SBV function template schematic
108 A.4.19 Sequence logic
109 Figure A.18 โ€“ Sequential control functions
112 Annex B (normative) SCD drawing standard
B.1 Overview
113 B.2 Content of SCDs
B.2.1 Equipment
114 B.2.2 Measuring instruments
B.2.3 Functions
B.2.4 Flow paths
115 B.2.5 Information not shown on the SCDs
B.2.6 Black box representation
B.2.7 Parallel equipment
116 B.3 Layout
B.3.1 Readability
B.3.2 The extent of information on SCDs
B.3.3 Location of information on the SCDs
B.3.4 Direction of flow
B.3.5 Page connectors
B.3.6 From P&ID/D&ID to SCD
117 B.4 Symbols
B.4.1 General
B.4.2 Function template symbol
Figure B.1 โ€“ The function template symbol
Figure B.2 โ€“ The additional information field
118 Table B.1 โ€“ Control function integration definition
119 B.4.3 Symbols for logic and arithmetic functions
Figure B.3 โ€“ Integration level I symbol
Figure B.4 โ€“ Integration level II symbol
Figure B.5 โ€“ Integration level III symbol
Figure B.6 โ€“ Object typical
120 Figure B.7 โ€“ Analogue selector
Table B.2 โ€“ EFB function notations
121 B.4.4 Extended connection line for EFB functions
Figure B.8 โ€“ Use of the “optional” notation “#”
Figure B.9 โ€“ Multiple split by extended connection line
Table B.3 โ€“ Timer/pulse logic diagrams
122 B.4.5 Parameter labels
B.4.6 Signal line
Figure B.10 โ€“ Multiple or/and by extended connection line
Figure B.11 โ€“ Multiple function terminals by extended connection line
Figure B.12 โ€“ Fixed parameter label
Figure B.13 โ€“ Signal line
123 B.4.7 Process line
Figure B.14 โ€“ Digital communication link
Figure B.15 โ€“ Electrical power line
Figure B.16 โ€“ Node split symbol for signal lines
Figure B.17 โ€“ Major process line
Figure B.18 โ€“ Minor process line
124 B.4.8 Line connections
Figure B.19 โ€“ Line connections
Figure B.20 โ€“ Simplified line connections
Figure B.21 โ€“ Process line connections
125 B.4.9 Process and signal line crossing/jump
B.4.10 Sequential flow chart lines
Figure B.22 โ€“ Line crossing
Figure B.23 โ€“ SFC lines
Figure B.24 โ€“ SFC alternative branch line
Figure B.25 โ€“ SFC parallel branch line
126 B.4.11 Instruments
B.4.12 Mechanical equipment
B.4.13 Valves
Figure B.26 โ€“ Instrument
Figure B.27 โ€“ Instrument tag location
127 Figure B.28 โ€“ On/off valve
Figure B.29 โ€“ Modulating control valve
Figure B.30 โ€“ Actuators variations
Figure B.31 โ€“ HVAC damper variations
128 Figure B.32 โ€“ Limit switches
Figure B.33 โ€“ Signal failure valve action
Figure B.34 โ€“ Normally energised input and output signals
Figure B.35 โ€“ Valve normal position
129 B.4.14 Electrical equipment
Figure B.36 โ€“ Electrical reference symbol
130 B.4.15 Sequence symbols
Figure B.37 โ€“ Electrical reference symbol use for variable drive
Figure B.38 โ€“ SFC sequence start and reference symbol
131 Figure B.39 โ€“ SFC step symbol
Figure B.40 โ€“ SFC transition symbol
Figure B.41 โ€“ SFC transition condition symbol
Figure B.42 โ€“ SFC step action symbol
132 Figure B.43 โ€“ SFC sequence end symbol
Figure B.44 โ€“ Single branch sequence path
133 Figure B.45โ€“ Alternate sequence path
134 B.4.16 Reference symbols
Figure B.46 โ€“ Parallel branch sequence path
Figure B.47 โ€“ Process line page connectors
Figure B.48 โ€“ Signal line page connectors
135 Figure B.49 โ€“ SIS reference triangle
Figure B.50 โ€“ Multiple SIS levels reference triangle
Figure B.51 โ€“ Sequence reference flags
136 B.5 Tagging
B.6 Terminal codes
Figure B.52 โ€“ Arrangement of terminals on function symbol
137 B.7 Symbol and font sizes
Table B.4 โ€“ Symbol sizes
141 Table B.5 โ€“ Line sizes
142 B.8 Layers and colors
143 B.9 Legend sheets
B.9.1 General
B.9.2 Part 1: Symbols and codes
B.9.3 Part 2: System specific function templates and terminal definition codes
Figure B.53 โ€“ Colours
144 B.9.4 Part 3: Applications typical
B.10 Drawing frame and title block
145 Annex C (informative) Project execution guideline
C.1 Overview
C.1.1 Objectives
C.1.2 Quality
C.1.3 Standardisation
146 C.1.4 Safety
C.1.5 Productivity
147 C.2 Implementation
C.2.1 Objectives
C.2.2 Unambiguous input
C.2.3 Standardisation
C.2.4 Productivity
148 C.2.5 Documentation
C.2.6 Verification
C.3 Commissioning
C.3.1 Objectives
Figure C.1 โ€“ SAS supplier interface
149 C.3.2 Commissioning procedures
C.3.3 Commissioning runs
C.4 Operation
C.4.1 General
C.4.2 Objectives
150 C.4.3 Production control
C.5 Modifications
151 Annex D (normative) SCD legend
D.1 Overview
D.2 Function template symbols
Table D.1 โ€“Function template symbols
Table D.2 โ€“ Additional information field
152 D.3 Function template terminal placement
D.4 Reference symbols
Table D.3 โ€“ Terminal placement l
Table D.4 โ€“ Reference symbols
153 D.5 Function identifier for safety system interface
Table D.5 โ€“ Safety system interface
154 D.6 Field device symbols
Table D.6 โ€“ Field device symbols
155 D.7 Instrument signals
D.8 Constant values
Table D.7 โ€“ Instrument signals
Table D.8 โ€“ Constant values
156 D.9 Logic and arithmetic symbols
Table D.9 โ€“ Logic and arithmetic symbols
157 D.10 Sequential function chart symbols
Table D.10 โ€“ Sequential function chart symbols
158 Annex E (informative) SCD application guidelines
E.1 Purpose
E.2 Tagging
E.3 Application typical
E.3.1 General
E.3.2 Process measurements
159 Figure E.1 โ€“ MA terminals
Figure E.2 โ€“ Totalization
160 Figure E.3 โ€“ Compensation of flow via a formula
Figure E.4 โ€“ Use of optional symbol for voting
Figure E.5 โ€“ Use of project specific function
161 Figure E.6 โ€“ Differential pressure measurement
Figure E.7 โ€“ MB with action
Figure E.8 โ€“ MB with alarm only
162 E.3.3 Action and warning alarms
Figure E.9 โ€“ Valve feedback presentation
Figure E.10 โ€“ Action alarms
Figure E.11 โ€“ Warnings
163 Figure E.12 โ€“ Force blocking action alarm high
Figure E.13 โ€“ Action alarm suppression
164 E.3.4 Process modulating control
Figure E.14 โ€“ PID control
Figure E.15 โ€“ PID control and action alarm
165 Figure E.16 โ€“ Cascade control
Figure E.17 โ€“ Split range control
166 Figure E.18 โ€“ Choke valve control
Figure E.19 โ€“ Binary control
Figure E.20 โ€“ Binary control with modulating control valve
167 Figure E.21 โ€“ Start/Stop control of pump
Figure E.22 โ€“ Tracking of control valve
168 E.3.5 Control of on/off valves and dampers
Figure E.23 โ€“ On/Off valve
Figure E.24 โ€“ Safeguarding of On/Off valve
169 Figure E.25 โ€“ Safeguarding of PSD valve
Figure E.26 โ€“ Safeguarding of ESD valve
170 Figure E.27 โ€“ Safeguarding blowdown valve with only ESD solenoid
Figure E.28 โ€“ Safeguarding blowdown valve with both ESD and PSD solenoid
171 E.3.6 Failure actions for of on/off valves
Figure E.29 โ€“ Fail close
Figure E.30 โ€“ Fail open
Figure E.31 โ€“ Normally energised output signal
172 E.3.7 On/off valves and control valve interaction
E.3.8 Electrical equipment control
Figure E.32 โ€“ Fail maintain
Figure E.33 โ€“ On/Off and control valve interaction
173 Figure E.34 โ€“ Communication interface to motor control center
174 Figure E.35 โ€“ Safeguarding of motor
Figure E.36 โ€“ Unit shutdown level stop of pump
175 Figure E.37 โ€“ Process shutdown level safeguarding of pump
176 Figure E.38 โ€“ Pump with automatic on/off control and PSD interlock
Figure E.39 โ€“ Heater with automatic on/off control and PSD interlock
177 Figure E.40 โ€“ Low voltage motors with modulating control via data communication
178 Figure E.41 โ€“ Low voltage motors with modulating control via hardwired signals
Figure E.42 โ€“ Duty/standby or lead/lag
179 E.3.9 HVAC
Figure E.43 โ€“ Three pumps in duty/standby
180 Figure E.44 โ€“ Control of HVAC dampers
181 Figure E.45 โ€“ HVAC fan and fire damper control on BCL and BCH
Figure E.46 โ€“ Control of multiple fans
182 Figure E.47 โ€“ HVAC heating and fan control
183 E.3.10 Shutdown
Figure E.48 โ€“ Control of thyristor controlled heater
Figure E.49 โ€“ Process shutdown group / level
184 Figure E.50 โ€“ Single process shutdown
185 Figure E.51 โ€“ Process shutdown level
Figure E.52 โ€“ Unit shutdown in PCS
186 E.3.11 Interface to external systems
Figure E.53 โ€“ Metering interface with flow computer shown
187 Figure E.54 โ€“ Metering interface without showing the flow computer on the SCD
Figure E.55 โ€“ Anti-surge interface
188 E.3.12 Condition monitoring
Figure E.56 โ€“ Vibration interface
189 E.3.13 Electrical distribution control
E.3.14 Parallel functions
Figure E.57 โ€“ Control of breakers
190 E.3.15 Sequences
Figure E.58 โ€“ Sequence references
Figure E.59 โ€“ Sequence header
191 Figure E.60 โ€“ Sequence flow chart
192 E.3.16 Use of “black boxes”
Figure E.61 โ€“ Setpoint of flow for 3 pumps
Figure E.62 โ€“ Black box representation
193 E.3.17 Use of project specific functions
194 Figure E.63 โ€“ Terminal representation for supplier F
195 Annex F (normative) SCD Control function templates behaviour
F.1 Purpose
F.2 Method for description of behaviour (control function state charts)
F.2.1 Basic idea
F.2.2 State charts
196 Figure F.1 โ€“ Example of state chart
197 F.2.3 Modelling of the processing of process information
Figure F.2 โ€“ Example state chart with terminals
198 F.2.4 Parallel state charts
Figure F.3 โ€“ Example state chart and electrical metaphors
200 F.2.5 Symbols used for modelling control functions using state charts
Figure F.4 โ€“ Overview of symbols used in state chart
201 F.3 Description of behaviour in various modes
F.3.1 General
F.3.2 Auto-manual mode
202 Figure F.5 โ€“ States and state transitions of Auto manual mode
203 F.3.3 Blocked mode
Figure F.6 โ€“ Blocked mode
204 Figure F.7 โ€“ Blocked HH mode
205 Figure F.8 โ€“ Blocked LL mode
206 F.3.4 Disable transition mode
Figure F.9 โ€“ Disable transition mode
207 F.3.5 Internal external mode
Figure F.10 โ€“ Internal External mode
208 F.3.6 Outside operation mode
Figure F.11 โ€“ Outside operation mode
209 F.3.7 Safeguarding mode
Figure F.12 โ€“ Force and Lock safeguarding mode
210 F.3.8 Suppress alarm mode
Figure F.13 โ€“ Suppress mode
211 Figure F.14 โ€“ Suppress alarm HH mode
212 Figure F.15 โ€“ Suppress Alarm LL mode
213 Figure F.16 โ€“ Suppress alarm WH mode
214 Figure F.17 โ€“ Suppress Alarm WL mode
215 F.3.9 Track mode
F.4 Definition of templates control function behaviour
F.4.1 General
F.4.2 CA โ€“ PID controller template behaviour
Figure F.18 โ€“ Track mode
217 Figure F.19 โ€“ Model of CA behaviour
218 F.4.3 CS โ€“ Step control template behaviour
219 Figure F.20 โ€“ Model of CS behaviour
220 F.4.4 HA โ€“ Analogue input command template behaviour
Figure F.21 โ€“ Model of HA behaviour
221 F.4.5 HB โ€“ Binary input command template behaviour
Figure F.22 โ€“ Model of HB behaviour
222 F.4.6 KB โ€“ Sequence header template behaviour
Figure F.23 โ€“ Model of KB behaviour
223 F.4.7 LB โ€“ Safeguarding shutdown level template behaviour
Figure F.24 โ€“ Model of LB behaviour
224 F.4.8 MA โ€“ Monitoring of analogue process variable template behaviour
225 Figure F.25 โ€“ Model of MA behaviour
226 F.4.9 MAS โ€“ Analogue measurement acquisition from subsystem template behaviour
Figure F.26 โ€“ Model of MAS behaviour
227 F.4.10 MB โ€“ Monitoring of binary (digital) process variables template behaviour
Figure F.27 โ€“ Model of MB behaviour
228 F.4.11 OA โ€“ Analogue output template behaviour
229 Figure F.28 โ€“ Model of OA behaviour
230 F.4.12 QA โ€“ Totalize template behaviour
Figure F.29 โ€“ Model of QA behaviour
231 F.4.13 SB โ€“ Single binary signal for shutdown template behaviour
F.4.14 SBB โ€“ Breaker control template behaviour
Figure F.30 โ€“ Model of SB behaviour
232 Figure F.31 โ€“ Model of SBB behaviour
233 F.4.15 SBC โ€“ Coordinator for SBE template behaviour
234 Figure F.32 โ€“ Model of SBC behaviour
235 F.4.16 SBE โ€“ Controls of electrical equipment template behaviour
236 Figure F.33 โ€“ Model of SBE behaviour
237 F.4.17 SBV โ€“ Control of pneumatic/hydraulic equipment template behaviour
238 Figure F.34 โ€“ Model of SBV behaviour
239 Annex G (informative) SCD readers manual
G.1 What is a system control diagram (SCD)?
G.2 Areas of use
240 G.3 The process part of system control diagrams (SCDs)
G.4 The control part of system control diagrams (SCDs)
G.4.1 General
G.4.2 Function blocks
241 G.4.3 Simple logic elements
G.4.4 Logic connections
G.5 Examples
G.5.1 Level control
242 G.5.2 Temperature control
Figure G.1 โ€“ Level control
Figure G.2 โ€“ Temperature control
243 Bibliography

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