Instruction manual

Output Wiring

continued

RFT9739 Field-Mount Transmitter Instruction Manual

Output Wiring Startup TroubleshootingBefore You Begin Getting Started Mounting

Power-Supply and

Sensor Wiring

5.5 Control output

The control output can indicate flow direction, transmitter zeroing in

progress, pressure input failure, faults, event 1 or event 2. For

information on configuring the control output for events, see any of the

following manuals or AMS on-line help:

•

Using the HART Communicator with Micro Motion Transmitters

•

Using ProLink Software with Micro Motion Transmitters

•

Using Modbus Protocol with Micro Motion Transmitters

Use RFT9739 terminals 22 and 16 for the control output. The control

output, frequency/pulse output, and external zero input share terminal

16 as a common return. See

Figure 5-10

• When configured to indicate flow direction, the output is high (+15 V)

when indicating forward flow, and low (0 V) when indicating reverse

flow.

• When configured to indicate transmitter zeroing in progress, the output

is low (0 V) when zeroing is in progress and high (+15 V) at all other

times.

• When configured to indicate faults, the output is low (0 V) when a fault

condition exists and high (+15 V) during normal operation.

• When configured to indicate event 1 or event 2, the output switches ON

(0 V) or OFF (+15 V) when the flow rate, flow total, density,

temperature, or pressure of the process fluid achieves a programmed

setpoint.

• The output circuit is rated to 30 VDC, with 0.1 ampere maximum

sinking capability, when used in open collector mode. Open collector

mode is described on page 36.

• Transmitter output is nominal 0 or +15 V, unloaded.

• Output impedance is 2.2 kohm.

Figure 5-10. Control output wiring

RFT9739

output terminals

RETURN (ground)

CONTROL (signal line)