flowserve.com
WARN
across the
permanen
Determine if th
positioner by p
Voltage = Com
Current
max
• (R
The calculated
order to safely
Example:
DCS Complia
R
barrier
= 300
Ω
R
wire
= 25
Ω
Current
max
= 2
Voltage = 19 V
Figure 7: Com
NING:
Never co
e positioner term
t circuit board d
he loop will sup
performing the
mpliance Voltage
R
barrier
+ R
wire
)
d voltage must
y support the L
nce Voltage =
Ω
20 mA
VDC – 0.020 A
mpliance voltag
onnect a voltag
minals. This co
damage.
pport the Logix
following calcu
e (@ Current
max
)
be greater tha
ogix 3200MD d
19 VDC
A • (300
Ω
+ 25
e
Use
e source direct
ould cause
x 3200MD digita
ulation:
–
Equation
an 10 VDC in
digital positione
Ω
) = 12.5 VDC
er instructions
tly
al
n 1
er.
C
The volt
therefor
position
input res
6.4
The Log
Commu
superim
frequen
2200 H
commu
restricti
limited
lower c
In addit
also aff
– Digital Positi
tage 12.5 VDC
re, this system w
ner. The Logix 3
sistance equiva
Cable Req
gix 3200MD di
unication proto
mposed on the
ncies used by t
z. In order to p
unication signal
ions must be ca
if the capacitan
apacitance/foo
tion to the cabl
fects the allowa
ioner 3200MD
is greater than
will support the
3200MD positio
alent to 500
Ω
a
uirements
gital positioner
col. This comm
4-20 mA curre
the HART proto
prevent distorti
l, cable capacit
alculated. The
nce is too high
ot rating will allo
e capacitance,
able cable leng
LGENIM0059
the required 10
Logix 3200MD
oner has a wors
at a 20 mA input
r utilizes the HA
munication sign
ent signal. The
ocol are 1200 H
ion of the HAR
tance and cabl
e cable length m
. Selecting a c
ow longer cable
, the network re
gth.
9-04 09/11
13
0.0 VDC;
digital
st case
t current.
ART
nal is
e two
Hz and
RT
e length
must be
cable with
e runs.
esistance
