Emerson Network Router - Manual (Page 17)

Installation and Use Manual 11
Installation and Setup
Pr
oL
in
k II
Setup
T
ransmitter Star
tup
Usi
ng
Pr
oL
in
k
II
Be
fo
re
Y
o
u
Begin
2.5.1 Connection diagrams
Use the following diagrams to make the connection between your PC and the transmitter.
Figure 2-1 Typical HART/Bell 202 connection to transmitter or multidrop network
Model 7835 EXD (2) 3 4
MVD ™ Direct Connect ™
with no barrier (3)
3 4
MVD Direct Connect with
I.S. barrier
• To barrier (4) 13 14
• To core processor (3) 3 4
Core processor 3 4
(1) If connecting to terminals 1 and 2, terminals must be externally powered, with a minimum of 250
Ω
and 17.5 volts. Requirement does
not apply to service port.
(2) Transmitter version with advanced electronics option only.
(3) Connection is not intrinsically safe.
(4) Intrinsically safe connection.
Table 2-1 Transmitter terminals for ProLink II connections continued
Transmitter
Terminals for connection type
HART/Bell 202 HART/RS-485 Modbus/RS-485 Service port
PV+ PV– A B A B A B
VIA
TOR
VIA
TOR
or
DCS or
PLC
R1
R3
R2
Primary mA output terminals
Transmitter
USB plug
Bell 202 signal
converter
Notes:
• Connect the HART interface leads to the primary mA output of the transmitter, or to any point on the network.
• If necessary, use any combination of R1, R2, and R3 to bring the total resistance within 250–600
Ω.
(250–1000
Ω for RFT9712 and RFT9739).
• If no other device is connected to the primary mA output, add R1.
• If the primary mA is connected to a DCS or PLC with R2:
• Where R2 is insufficient, add R1 to bring R1+R2 into range.
• Where R2 is absent, add R3.