
8
Using ProLink
®
Software with Micro Motion
®
Transmitters
Getting Started
continued
Wiring to the transmitter
Figure 2-2. Bell 202 temporary connection to field-mount transmitters
Notes for Figure 2-2
1.
If necessary, add resistance in the loop by installing resistor R1. SMART FAMILY devices require a minimum loop resistance of
250 ohms. Loop resistance must not exceed 1000 ohms, regardless of the communication setup.
2.
The DCS or PLC must be configured for an active milliamp signal.
3.
Resistor R3 is required if the DCS or PLC does not have an internal resistor.
4.
Resistor R4 is required if the illustrated transmitter output wiring is not connected to an input device. Required loop resistance:
minimum 250 ohms, maximum 1000 ohms. Wrap ends of resistor around prongs of plug before inserting into jack.
CAUTION
Connecting a HART device to the transmitter’s primary analog output could cause transmitter output
error.
If the primary variable analog output is being used for flow control, connecting a PC interface adaptor to the
primary analog output loops or legs could cause the transmitter 4-20 mA output to change, which would affect flow
control devices.
Set control devices for manual operation before connecting a PC interface adaptor to the transmitter’s primary
analog output loops or legs.
R1
(Note 1)
R3
(Note 3)
DCS or PLC
with internal
resisitor
(Note 2)
R2
14 15 16 17 18 19 20 P
21 22 23 24 25 26 27 S
19 18 17 16 15 14
26
25
24
23
22
21
R4
(Note 4)
R4
(Note 4)
Receive
Transmit
Power
Low Batt
AC
Adaptor
202 Off 485
202
485
A
B
Receive
Transmit
Power
Low Batt
AC
Adaptor
202 Off 485
202
485
A
B
RFT9739
field-mount
RFT9712
Communicator hook-up loops
same as primary mA output
wiring circuit at left
Communicator legs
same as primary mA
output wiring circuit
at left
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