Instruction manual

40 RFT9739 Rack-Mount Transmitter Instruction Manual
Output Wiring
continued
5.5 Control output
The control output can indicate flow direction, transmitter zeroing in
progress, 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 CN2-Z24 and CN2-D26 for the control output.
Terminal D26 serves as a common return for the control output,
frequency/pulse output, dual-channel frequency output, and remote zero
input. See
Figure 5-16
.
• When configured to indicate flow direction, the output is high
(+15 VDC) when indicating forward flow, and low (0 VDC) when
indicating reverse flow.
• When configured to indicate transmitter zeroing in progress, the output
is low (0 VDC) when zeroing is in progress and high (+15 VDC) at all
other times.
• When configured to indicate faults, the output is low (0 VDC) when a
fault condition exists and high (+15 VDC) during normal operation.
• When configured to indicate event 1 or event 2, the output switches ON
(0 VDC) or OFF (+15 VDC) 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 41.
• Transmitter output is nominal 0 or +15 VDC, unloaded.
• Output impedance is 2.2 kohm.
Figure 5-16.
Control output wiring
RFT9739
output terminals
CONTROL (signal line)
RETURN (ground)