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October 2022
Configuration and Use Manual
MMI-20019053
Restriction
If Digital Communications Fault Action is set to NAN (not a number), you cannot set mA Output Fault
Action or Frequency Output Fault Action to None. If you try to do this, the transmitter will not accept the configuration.
2. If you set mA Output Fault Action to Upscale or Downscale, set mA Output Fault Level as desired.
Postrequisites
NOTICE
If you set mA Output Fault Action or Frequency Output Fault Action to None, be sure to set Digital
Communications Fault Action to None. If you do not, the output will not report actual process data, and this may result in measurement errors or unintended consequences for your process.
Options for mA Output Fault Action and mA Output Fault Level
Option
Upscale
Downscale (default)
Internal Zero mA Output behavior
Goes to the configured fault level
Goes to the configured fault level mA Output Fault Level
Default: 22.0 mA
Range: 21.0 to 24.0 mA
Default: 2.0 mA
Range: 1.0 to 3.6 mA
Not applicable
None
Goes to the mA Output level associated with a process variable value of 0 (zero), as determined by Lower Range Value and Upper Range Value settings
Tracks data for the assigned process variable; no fault action
Not applicable
6.3 Configure the Frequency Output
The Frequency Output is used to report a process variable. The Frequency Output parameters control how the process variable is reported. Your transmitter may have zero, one, or two Frequency Outputs, depending on the configuration of Channels B and C. If both Channels B and C are configured as Frequency Outputs, they are electrically isolated but not independent. You cannot configure them separately.
Important
Whenever you change a Frequency Output parameter, verify all other Frequency Output parameters before returning the flowmeter to service. In some situations, the transmitter automatically loads a set of stored values, and these values may not be appropriate for your application.
6.3.1 Configure Frequency Output Process Variable
Display
ProLink III
Field Communicator
OFF-LINE MAINT → OFF-LINE CONFG → IO → CONFIG CH B → SET FO → FO SRC
OFF-LINE MAINT → OFF-LINE CONFG → IO → CONFIG CH C → SET FO → FO SRC
Device Tools → Configuration → I/O → Outputs → Frequency Output
Configure → Manual Setup → Inputs/Outputs → Frequency Output → FO Settings → Third Variable
88 Micro Motion 2700 Transmitters with Configurable Input/Outputs
Configuration and Use Manual
MMI-20019053
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October 2022
Frequency Output Process Variable controls the variable that is reported over the Frequency Output.
Prerequisites
If you plan to configure the output to report volume flow, ensure that you have set Volume Flow Type as desired: Liquid or Gas Standard Volume.
If you plan to configure an output to report a concentration measurement process variable, ensure that the concentration measurement application is configured so that the desired variable is available.
If you are using the HART variables, be aware that changing the configuration of Frequency Output Process
Variable will change the configuration of the HART Tertiary Variable (TV).
Procedure
Set Frequency Output Process Variable as desired.
The default setting is Mass Flow Rate.
Options for Frequency Output Process Variable
The transmitter provides a basic set of options for Frequency Output Process Variable , plus several application-specific options. Different communications tools may use different labels for the options.
Table 6-8: Standard FO process variables
Process variable
Gas standard volume flow rate
Mass flow rate
Volume flow rate
Display
GSV F
MFLOW
VFLOW
Label
ProLink III
Gas Standard Volume Flow
Rate
Mass Flow Rate
Volume Flow Rate
Field Communicator
Gas vol flo
Mass flo
Vol flo
Table 6-9: Petroleum measurement FO process variables
Process variable
Temperature-corrected
(standard) volume flow rate
Display
TCVOL
Label
ProLink III
Volume Flow Rate at
Reference Temperature
Table 6-10: Concentration measurement FO process variables
Process variable
Net mass flow rate
Net volume flow rate
Display
NET M
NET V
Standard volume flow rate STD V
Label
ProLink III
Net Mass Flow Rate
Net Volume Flow Rate
Volume Flow Rate at
Reference Temperature
Field Communicator
TC Vol
Field Communicator
ED Net Mass flo
ED Net Vol flo
ED Std Vol flo
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Configuration and Use Manual
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Table 6-11: Fuel consumption FO process variables
Process variable
Differential mass flow
Label
Display ProLink III
Differential Mass Flow Rate Differential Mass Flow
Field Communicator
Differential Mass Flow Rate
6.3.2 Configure Frequency Output Polarity
Display
ProLink III
Field Communicator
OFF-LINE MAINT → OFF-LINE CONFG → IO → CONFIG CH B → SET FO → FO POLAR
OFF-LINE MAINT → OFF-LINE CONFG → IO → CONFIG CH C → SET FO → FO POLAR
Device Tools → Configuration → I/O → Outputs → Frequency Output
Configure → Manual Setup → Inputs/Outputs → Frequency Output → FO Settings → FO Polarity
Frequency Output Polarity controls how the output indicates the ON (active) state. The default value, Active
High, is appropriate for most applications. Your receiving device might require an Active Low setting.
Procedure
Set Frequency Output Polarity as desired.
The default setting is Active High.
Options for Frequency Output Polarity
Polarity option
Active High
Active Low
Reference voltage (OFF)
0
As determined by power supply, pull-up resistor, and load. See the installation manual for your transmitter.
Pulse voltage (ON)
As determined by power supply, pull-up resistor, and load. See the installation manual for your transmitter.
0
6.3.3 Configure Frequency Output Scaling Method
Display
ProLink III
Field Communicator
OFF-LINE MAINT → OFF-LINE CONFG → IO → CONFIG CH B → SET FO → FO SCALE
OFF-LINE MAINT → OFF-LINE CONFG → IO → CONFIG CH C → SET FO → FO SCALE
Device Tools → Configuration → I/O → Outputs → Frequency Output
Configure → Manual Setup → Inputs/Outputs → Frequency Output → FO Scaling
Frequency Output Scaling Method defines the relationship between output pulse and flow units. Set
Frequency Output Scaling Method as required by your frequency receiving device.
Procedure
1. Set Frequency Output Scaling Method .
90 Micro Motion 2700 Transmitters with Configurable Input/Outputs
Configuration and Use Manual
MMI-20019053
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October 2022
Option
Frequency=Flow (default)
Pulses/Unit
Units/Pulse
Description
Frequency calculated from flow rate
A user-specified number of pulses represents one flow unit
A pulse represents a user-specified number of flow units
2. Set additional required parameters.
• If you set Frequency Output Scaling Method to Frequency=Flow, set Rate Factor and Frequency
Factor .
• If you set Frequency Output Scaling Method to Pulses/Unit, define the number of pulses that will represent one flow unit.
• If you set Frequency Output Scaling Method to Units/Pulse, define the number of units that each pulse will indicate.
For all scaling methods, the transmitter puts out a fixed number of pulses per unit, and at the same time, the Frequency Output signal varies in proportion to flowrate.
Calculate frequency from flow rate
The Frequency=Flow option is used to customize the Frequency Output for your application when you do not know appropriate values for Units/Pulse or Pulses/Unit.
If you specify Frequency=Flow, you must provide values for Rate Factor and Frequency Factor :
Rate Factor The maximum flow rate that you want the Frequency Output to report.
Frequency Factor A value calculated as follows:
× N where:
T Factor to convert selected time base to seconds
N Number of pulses per flow unit, as configured in the receiving device
The resulting Frequency Factor must be within the range of the Frequency Output 0 to 10,000 Hz:
• If Frequency Factor is less than 1 Hz, reconfigure the receiving device for a higher pulses/unit setting.
• If Frequency Factor is greater than 10,000 Hz, reconfigure the receiving device for a lower pulses/unit setting.
6.3.4 Configure Frequency Output Mode
Display
• OFF-LINE MAINT → OFF-LINE CONFG → IO → CONFIG CH B → SET FO → FO MODE
• OFF-LINE MAINT → OFF-LINE CONFG → IO → CONFIG CH C → SET FO → FO MODE
ProLink III
Field communicator
Device Tools → Configuration → I/O → Outputs → Frequency Output
Not available
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Configuration and Use Manual
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Frequency Output Mode defines the relationship between the two Frequency Outputs (dual-pulse mode).
Prerequisites
Before configuring Frequency Output Mode , ensure that both Channel B and Channel C are configured to operate as Frequency Outputs. If you do not have two Frequency Outputs on your transmitter, Frequency
Output Mode is set to Single and cannot be changed.
Procedure
Set Frequency Output Mode as desired.
The default value is Quadrature.
Options for Frequency Output Mode
Option
In-Phase
50% duty cycle
Channel behavior
Channel B
Channel C
Process condition
90° Phase Shift
50% duty cycle
–90° Phase Shift
50% duty cycle
Channel B
Channel C
Channel B
Channel C
180° Phase Shift
50% duty cycle
Quadrature
(1)
50% duty cycle
Channel B
Channel C
Channel B
Channel C
Channel B
Channel C
Forward flow
Channel C lags Channel B by 90°
Reverse flow
Channel C leads Channel B by 90°
Channel B
Channel C
Fault condition
Channel C is driven to 0
(1) Quadrature mode is used only for specific Weights & Measures applications where required by law.
6.3.5 Configure Frequency Output Fault Action and Frequency
Output Fault Level
Display
ProLink III
Field Communicator
Not available
Device Tools → Configuration → Fault Processing
• Configure → Manual Setup → Inputs/Outputs → Frequency Output → FO Fault Parameters → FO
Fault Action
• Configure → Manual Setup → Inputs/Outputs → Frequency Output → FO Fault Parameters → FO
Fault Level
92 Micro Motion 2700 Transmitters with Configurable Input/Outputs
Configuration and Use Manual
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Integrate the meter with the control system
October 2022
Frequency Output Fault Action controls the behavior of the Frequency Output if the transmitter encounters an internal fault condition.
Note
For some faults only: If Fault Timeout is set to a non-zero value, the transmitter will not implement the fault action until the timeout has elapsed.
Procedure
1. Set Frequency Output Fault Action as desired.
The default value is Downscale (0 Hz).
2. If you set Frequency Output Fault Action to Upscale, set Frequency Fault Level to the desired value.
The default value is 15000 Hz. The range is 10 to 15000 Hz.
Options for Frequency Output Fault Action
Table 6-12: Options for Frequency Output Fault Action
Label
Upscale
All modes except Quadrature
Frequency output behavior
Quadrature mode
Goes to configured Upscale value:
• Range: 10 Hz to 15000 Hz
• Default: 15000 Hz
Channel B: Goes to configured Upscale value
Channel C: 0 Hz
Downscale
Internal Zero
None (default)
0 Hz
0 Hz
Tracks data for the assigned process variable; no fault action
Channel B: goes to configured Upscale value
Channel C: 0 Hz
Channel B: Goes to configured Upscale value
Channel C: 0 Hz
Channel B: Tracks data for the assigned process variable
Channel C: Tracks data for the assigned process variable
If your transmitter has two Frequency Outputs, their fault behavior is the same for all modes except
Quadrature.
NOTICE
If you set mA Output Fault Action or Frequency Output Fault Action to None, be sure to set Digital
Communications Fault Action to None. If you do not, the output will not report actual process data, and this may result in measurement errors or unintended consequences for your process.
Restriction
If Digital Communications Fault Action is set to NAN (not a number), you cannot set mA Output Fault
Action or Frequency Output Fault Action to None. If you try to do this, the transmitter will not accept the configuration.
Configuration and Use Manual 93
