Allen-Bradley 1756-CFM, Руководство пользователя

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Rockwell Automation Publication 1756-UM010C-EN-P - June 2021 39
Chapter 3 Configurable Flowmeter Module Features and Operational Modes
Trigger On
Use Trigger On to determine what flowmeter state triggers the output to
energize. For example, you can configure the module to trigger an output
when the flowmeter reaches a particular frequency (count).
These events can trigger output 0 when using the flowmeter function:
• Frequency - flowmeter exceeds a certain frequency (count)
• Acceleration - flowmeter accelerates beyond a particular rate
• Prover Run State - flowmeter is operating in the run state
• Prover Range State - flowmeter is enabled and not complete
• Full Flow - flowmeter is in Full Flow mode
• Trickle Flow - flowmeter is in Trickle Flow mode
Tie to Counter
Choose which output is connected to which flowmeter input.
Total Overflow
Use Total Overflow to monitor when the total counts has exceeded the rollover
value. The rollover value is a user-defined value set during configuration.
Three events must occur for you to use this feature:
• Overflow is enabled
• You set a rollover value
• The count total exceeds the rollover value
When the rollover value is exceeded, the Total Overflow bit is toggled to
indicate the event and the Overflow Alarm is set.
Total Overrange
Use Total Overrange to monitor when a flowmeter exceeds the maximum
frequency (100 kHz). The maximum frequency period is calculated by the
number of pulses being counted by the flowmeter per second. When the
frequency period exceeds 100 kHz, and the Overrange Alarm is enabled, the
Overrange Alarm is set.