Emerson Micro Motion 1700 - Input;Output Signals

11.2 Input/output signals
I/O and digital communication for Model 1700 transmittersTable 11-2:
Description
Model 1700
with output
code
A D
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 +24 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 flow direction and flow
switch
✓
One intrinsically safe passive 4–20mA output:
• Maximum input voltage: 30 VDC, 1 watt maximum
• Maximum load limit: R
max
= (V
supply
– 12)/0.023
(1)
• Can report mass flow or volume flow
• Entity parameters: U
i
= 30 VDC, I
i
= 300 mA, P
i
= 1W, Ci = 0.0005 μF, L
i
= Less
than 0.05mH
• Output is linear with process from 3.8 to 20.5 mA, per NAMUR NE43 Version
03.02.2003
✓
One intrinsically safe frequency/pulse output or configurable frequency/pulse/dis-
crete output:
• Maximum input voltage: 30 VDC, 0.75 watt maximum
• Maximum load limit:
- Rmax = (V
supply
- 4)/0.003
- Rmin = (V
supply
- 25)/0.006
(2)
• Rreports the same flow variable as the mA output
• Frequency output is independent of the mA output
• Scalable to 10,000 Hz
• Entity parameters: U
i
= 30 VDC, I
i
= 100 mA, P
i
= 0.75W, C
i
= 0.0005 μF, L
i
=
Less than 0.05mH
• Output is linear with flow rate to 12,500 Hz
✓
Service port:
• Can be used for temporary connection only
• Uses RS-485 Modbus signal, 38.4 kilobaud, one stop bit, no parity
✓ ✓
Specifications
106 Micro Motion
®
Model 1700 and 2700