Emerson Series 3000 MVD Manuel D’Utilisation
256
Micro Motion
®
Series 3000 MVD Transmitters and Controllers
Specifications – Model 3350 and Model 3700
Discrete outputs
Three discrete outputs
•
Configurable for the application
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Polarity: Active high or active low, software selectable
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Power: Internal pull-up to 24 V
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Voltage: 24 VDC nominal
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Current: Sourcing at 5.6 mA when V
out
= 3 VCD; sinking up to 500 mA at 30 VDC maximum
Frequency/pulse output
One 2-wire frequency/pulse output
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Output is linear with flow rate to 12,500 Hz
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Configurable unit of measure
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Scalable to 10000 Hz
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Pulse width: 50% duty cycle above 500 Hz, configurable for frequencies below 500 Hz
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Power: Active or passive, software selectable
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Polarity: Active high or active low, software selectable
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Voltage: 24 VDC nominal, active; 30 VDC applied maximum, passive
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Current: Sourcing, 10 mA at 3 VDC, active; sinking, 500 mA, active or passive
Fault output
When a fault is detected, outputs go to configured states. User can select high, low, last measured
value, or internal zero. Milliamp outputs conform to NAMUR NE43 (June 1994).
value, or internal zero. Milliamp outputs conform to NAMUR NE43 (June 1994).
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High output limits can be configured from 21 to 24 mA for milliamp; 15,000 Hz for frequency
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Low output limits can be configured from 1 to 3.6 mA for milliamp; 0 Hz for frequency
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Last measured value is the last output for the process variable
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Internal zero drives the milliamp and frequency outputs for process variables to zero values
B.6.4
Digital communications
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One RS-485 port (standard)
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Supports Modbus RTU, Modbus ASCII, HART/RS-485, or printer
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User-configurable
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HART superimposed on primary mA output
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Standard HART/Bell 202 communication parameters, not configurable
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External adapters (not included) required for conversion to RS-232