256 Micro Motion
®
Series 3000 MVD Transmitters and Controllers
Specifications – Model 3350 and Model 3700
Discrete outputs
Three discrete outputs
• Configurable for the application
• Polarity: Active high or active low, software selectable
• Power: Internal pull-up to 24 V
• Voltage: 24 VDC nominal
• 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
• Output is linear with flow rate to 12,500 Hz
• Configurable unit of measure
• Scalable to 10000 Hz
• Pulse width: 50% duty cycle above 500 Hz, configurable for frequencies below 500 Hz
• Power: Active or passive, software selectable
• Polarity: Active high or active low, software selectable
• Voltage: 24 VDC nominal, active; 30 VDC applied maximum, passive
• 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).
• High output limits can be configured from 21 to 24 mA for milliamp; 15,000 Hz for frequency
• Low output limits can be configured from 1 to 3.6 mA for milliamp; 0 Hz for frequency
• Last measured value is the last output for the process variable
• Internal zero drives the milliamp and frequency outputs for process variables to zero values
B.6.4 Digital communications
• One RS-485 port (standard)
- Supports Modbus RTU, Modbus ASCII, HART/RS-485, or printer
- User-configurable
• HART superimposed on primary mA output
- Standard HART/Bell 202 communication parameters, not configurable
• External adapters (not included) required for conversion to RS-232
