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3-6 Digital Input/Counter Functional Block
DRY_CONTACT:
minimum period = min(500ms, 2 * debounce interval)
maximum frequency = 1/minimum period
5V, 12V, 24V, or 32V :
maximum frequency = 20kHz
Repeating Count
Counts the off to on transitions from zero up to a configurable value called the
terminal count. When the Digital Input/Counter reaches the terminal count the
count is reset to zero. For example, a terminal count of 4 would produce values
of zero, one, two, three, zero, one, two, three, … on the
Analog output network
variable (an appropriate network variable type for the
Analog output network
variable in this mode is
SNVT_count_f).
The Digital Input/Counter signals that it has reached the terminal count by
asserting the
Digital network variable. The Digital network variable stays
on until the
Control network variable is set to CLEAR.
If the hardware input has been configured for Dry Contact, the input may be
configured to be debounced with a configurable time period. If the hardware
input has been configured for voltage input (5V, 12V, 24V, or 31V), debounce is
not supported.
If the
Control network variable is not connected, the Repeating Count
processing will free-run and count repeatedly from zero to terminal count –1 on
the
Analog network variable. In this case the maximum input frequency is
dependent on input hardware configuration as follows:
DRY_CONTACT:
minimum period = min(500ms, 2 * debounce interval)
maximum frequency = 1/minimum period
5V, 12V, 24V, or 32V :
maximum frequency = 20kHz
If the
Control network variable is connected, the Repeating Count maximum
input frequency is dependent on the time between the
Digital network variable
going to On and downstream logic setting the
Control network variable to
CLEAR for a short enough time period such that the count function does not reach
the terminal count a second time.
Repeating count example:
A canning application needs to determine when four cans have passed down a
chute to tell a downstream boxing machine to package the cans. The boxing
machine indicates when it has completed its task. On the Digital Input/Counter,
select Repeating Count mode, set the terminal count to four, and the Default
Input for the
Control network variable to RUN via the LonPoint Plug-in. After
reset the count is set to 0, as cans go by, the count reported by the
Analog
network variable goes; 0, 1, 2, 3, then, on the arrival of the next can, the Digital
- 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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