Micro Motion RFT9709 Manual de instrucciones Pagina 24

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10
Using ProLink
®
Software with Micro Motion
®
Transmitters
Getting Started
continued
Wiring to the transmitter
Figure 2-4. Bell 202 hard-wiring to transmitters or multidrop networks
Notes for Figure 2-4
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 (600 ohms for an IFT9701), 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.
CAUTION
Connecting a HART device to the transmitter’s primary milliamp output loop could cause transmitter
output error.
If the primary variable analog output is being used for flow control, connecting a PC interface adaptor to the output
loop 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
variable milliamp output loop.
R1
(Note 1)
R3
(Note 3)
DCS or PLC
with internal
resisitor
(Note 2)
R2
4–20mA
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
Z30D30
CN2
B14
B16
CN2
Receive
Transmit
Power
Low Batt
AC
Adaptor
202 Off 485
202
485
A
B
RFT9739
rack-mount
RFT9729
RFT9739
field-mount
IFT9701 RFT9712
IFT9703
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