Echelon LonPoint Application and Plug-In Bedienungsanleitung Seite 86
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9-2 PID Controller Functional Block
The PID Controller Functional Block
The PID Controller functional block controls an output network variable value
based on an input process variable and setpoint. The process variable is obtained
from a sensor that measures an environmental condition, such as temperature or
air pressure. The setpoint indicates the desired value of the process variable. The
PID controller reads these values and based on the PID algorithm, outputs a value
known as the controlled variable. This variable is used to drive an actuator that
effects the environmental condition which is read by the sensor that produces the
process variable.
For example, a PID functional block may be used to control the temperature of a
room. The process variable would be connected to a sensor that reads the current
temperature of the room, the setpoint would be determined manually through the
use of a dial or control panel, and the controlled variable would be connected to an
actuator that drives a VAV damper.
The following figure and tables summarize the inputs and outputs of the AFB
functional block:
Input Network Variables
Default name Default type Description
PV SNVT_temp_f
(changeable)
The process variable network
variable.
SP SNVT_temp_f
(changeable)
The setpoint network variable.
Auto_Man SNVT_switch The auto/manual network variable.
If this network variable is set to
On, the PID controller will be in
Auto. If this network variable is set
to Off, the PID controller will be in
manual. See the
Presets tab for
more information.
Man_Value SNVT_lev_cont_f The manual value network
variable. See the
Presets tab for
more information.
Mode SNVT_hvac_mode
(changeable)
The mode network variable. See
the Presets tab for more
information.
- LonPoint 1
- Application 1
- Contents 3
- LonPoint System Overview 7
- 1-2 LonPoint System Overview 8
- Getting Started 10
- LonPoint Applications 10
- LONMARK Certified: Yes 11
- Upstream and Downstream 12
- Heartbeats 12
- Throttle 13
- Default Values 13
- Override Values 13
- Network Variables 14
- ONMARK Reference help file.) 15
- Network Variable Formats 16
- 1-12 LonPoint System Overview 18
- The Digital Input Functional 19
- Digital Input 21
- Delayed Processing option 23
- Pulsed or the One-Shot 23
- XX (e.g. 2.XX) 24
- The Digital Input/Counter 27
- Functional Block: Application 27
- SNVT_temp_f 28
- Digital Input/Counter 29
- Processing Options 30
- One-Shot 31
- Repeating Count 32
- Can Counter 33
- Boxing Machine 33
- Frequency 34
- Processing Parameters 35
- Translation 36
- Output Parameters 37
- The Digital Output Functional 39
- Digital Output 41
- Input Defaults 44
- Mode network 45
- Hand-Off-Auto switch 48
- SNVT_hvac_mode 50
- Digital Encoder, Lookup 50
- Digital Encoder 51
- Lookup Tables 52
- Mode_Out 54
- The Analog Input Functional 57
- Analog Input, Translation 58
- Analog Input 59
- Ω RTD measures 0.12º C at the 60
- The Analog Output Functional 67
- Configuring an Analog Output 68
- Analog Output 69
- Defaults 70
- The AFB Functional Block: 73
- Application and Plug-in 73
- Analog Function Block 75
- Function 78
- The PID Controller Functional 85
- Enable network variable 88
- PID Coefficients 91
- Cascade – 100
- Reverse Acting process 101
- The Scheduler Functional 103
- Blocks: Application and the 103
- LonPoint Schedule Maker 103
- SetTime Time 104
- SCH- 1 Clock 104
- SCH- 1 Event Scheduler 105
- SCH- 1 State Machine 105
- Types of Schedules 107
- Defining Daily Schedules 108
- Daily Schedule 109
- Default Daily Schedule 110
- Defining Inputs and Outputs 111
- 10-10 Scheduler Interface 112
- Digital Inputs 113
- Digital Outputs 114
- 10-14 Scheduler Interface 116
- Defining State Transitions 117
- 10-16 Scheduler Interface 118
- State Transition Definitions 119
- Defining Exit Conditions 120
- Exit Condition Definitions 121
- 10-20 Scheduler Interface 122
- Configuring Daily Schedules 124
- 10-24 Scheduler Interface 126
- Configuring a State Machine 128
- Assigning Input/Output Names 128
- 10-28 Scheduler Interface 130
- Defining the State Machine 131
- 10-30 Scheduler Interface 132
- 10-32 Scheduler Interface 134
- Setting Scheduler Options 135
- 10-34 Scheduler Interface 136
- 10-36 Scheduler Interface 138
- Resetting the Simulator 139
- Using Debug Mode 139
- Simulating Inputs 140
- Running to the Next Event 140
- Overriding the Event Schedule 141
- 10-40 Scheduler Interface 142
- Setting the SCH-10 Time 144
- Testing a Schedule Design 145
- 10-44 Scheduler Interface 146
- The Schedule Keeper Utility 147
- Modifying the Daily Schedules 149
- 11-4 Schedule Keeper Utility 150
- Schedule 151
- Modifying Schedule Overrides 152
- Modifying System Parameters 153
- Adding Schedule Constraints 154
- Schedule Constraint Equations 155
- Operands 156
- Operators 156
- Examples: 156
- Adding Parameter Constraints 157
- Converting to US Units 159
- 11-14 Schedule Keeper Utility 160
- Data_In and Data_Out network 162
- Type Translator and Status 162
- Type Translator 163
- Scaling or Mapping values 165
- The Data Logger Functional 167
- Block: Application, Plug-in 167
- SNVT_str_asc 168
- SNVT_switch 168
- Data Logger 169
- Input Options 170
- Input Limits 171
- Log High 172
- Log Options 173
- Data network variable 174
- Attributes 174
- Data Logger Selection 177
- Menu Commands 178
- Formatting Preferences 179
- Monitoring Preferences 180
- Log Preferences 181
- Data Log list and select 182
- CSV Text File Format 183
- Tagname Line 183
- Data Lines 184
- Data Point Formats 185
- Command Line Switches 185
- The Node Object Functional 188
- ONMARK aware network tools 189
- Status network 190
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