Input/Output Signals - Emerson Micro Motion 1500 Installation Manual

Specifications
7.2

Input/output signals

Table 7-2:
Description
One active 4–20 mA output, not intrinsically safe:
• Isolated to ±50 VDC from all other outputs and Earth ground
• Maximum load limit: 820 ohms
• Can report mass flow or volume flow
• Output is linear with process from 3.8 to 20.5 mA, per NAMUR NE43 Version 03.02.2003
One active frequency/pulse output, not intrinsically safe:
• Can report mass flow or volume flow, which can be used to indicate flow rate or total
• Reports the same flow variable as the mA output
• Scalable to 10,000 Hz
• Voltage is +15 VDC ±3% with 2.2 kohm internal pull-up resistor
• Linear with flow rate to 12,500 Hz
• Configurable polarity: active high or active low
• Can be configured as a discrete output to report five discrete events, flow direction, flow
switch, calibration in progress, or fault
Service port, Modbus/RS-485 (terminals 33-34)
• After device power up, terminals 33 and 34 are available in service port mode for 10 seconds:
-
-
-
-
-
• After 10 seconds, terminals 33 and 34 default to Modbus/RS-485:
-
-
-
-
HART/Bell 202:
• HART Bell 202 signal is superimposed on the primary milliamp output, and is available for host
system interface. Frequency 1.2 and 2.2 kHz, Amplitude: to 1.0 mA, 1200 baud, Requires 250
to 600 ohms load resistance
• HART revision 5 as default, selectable to HART revision 7
One zero button that can be used to start the flowmeter zeroing procedure
48
I/O and digital communication for Model 1500 transmitters
Modbus RTU protocol
38,400 baud
No parity
One stop bit
Address = 111
Modbus RTU or Modbus ASCII protocol (default: Modbus RTU)
1200 to 38,400 baud rate (default: 9600)
Stop bit configurable (default: one stop bit)
Parity configurable (default: odd parity)
Micro Motion ® Model 1500 and Model 2500