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FieldPoint Operating Instructions
FP-AO-200 AND CFP-AO-200
Eight-Channel 20 mA Loop Output Modules
These operating instructions describe how to install and use the
National Instruments FP-AO-200 and cFP-AO-200 analog output
modules (referred to inclusively as the [c]FP-AO-200). For
information about configuring and accessing the [c]FP-AO-200
over a network, refer to the user manual for the FieldPoint network
module you are using.
Features
The [c]FP-AO-200 is a FieldPoint analog output module with the
following features:
• Eight 0–20 or 4–20 mA outputs
• 0.5 mA overranging
• 12-bit resolution
• Up to 1 kΩ load impedance (with 24 V loop supply)
• Indicators for open current loops
• Short-circuit protection
• 2,300 V
inter-module communication bus and the I/O channels
• –40 to 70 °C operation
• Hot plug-and-play
transient overvoltage protection between the
rms
FieldPoint™, National Instruments™, NI™, and ni.com™ are trademarks of National Instruments Corporation.
Product and compa ny names mentioned herein are trade marks or trade names of their respecti ve companies.
For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software,
the
patents.txt file on your CD, or ni.com/p atents.
323343A-01 October 2002
© 2002 National Instruments Corp. All rights reserved.
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Installing the FP-AO-200
The FP-AO-200 mounts on a FieldPoint terminal base (FP-TB-x).
Hot plug-and-play enables you to install the FP-AO-200 onto a
powered terminal base without disturbing the operation of other
modules or terminal bases. The FP-AO-200 receives operating
power from the terminal base. Current loop power is externally
supplied.
To install the FP-AO-200, refer to Figure 1 and complete the
following steps:
1. Slide the terminal base key to either position X (used for any
module) or position 2 (used for the FP-AO-200 module).
2. Align the FP-AO-200 alignment slots with the guide rails on
the terminal base.
3. Press firmly to seat the FP-AO-200 in the terminal base. The
terminal base latch locks the FP-AO-200 into place when it is
firmly seated.
4. Connect a current loop supply for the outputs to the V and C
terminals of the terminal base.
Key
Latch
Alignment
Slot
Guide Rails
Terminal BaseI/O Module
Figure 1. Installing the FP-AO-200
Installing the cFP-AO-200
The cFP-AO-200 mounts on a Compact FieldPoint backplane
(cFP-BP-x). Hot plug-and-play enables you to install the
cFP-AO-200 onto a powered backplane without disturbing the
operation of other modules or connector blocks. The cFP-AO-200
receives operating power from the backplane.
FP-AO-200 and cFP-AO-200 2 ni.com
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To install the cFP-AO-200, refer to Figure 2 and complete the
following steps:
1. Align the captive screws on the cFP-AO-200 with the holes on
the backplane. The alignment keys on the cFP-AO-200 prevent
backward insertion.
2. Press firmly to seat the cFP-AO-200 on the backplane.
3. Using a number 2 Phillips screwdriver with a shank of at least
64 mm (2.5 in.) length, tighten the captive screws to 1.1 N ⋅ m
(10 lb ⋅ in.) of torque. The nylon coating on the screws prevents
them from loosening.
2 1
4
3
1 cFP Backplane
2 cFP Controller Module
Figure 2. Installing the cFP-AO-200
4
3cFP-AO-200
4 Captive Screws
5
5
5 Screw Holes
© National Instruments Corp. 3 FP-AO-200 and cFP-AO-200
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Wiring the [c]FP-AO-200
The FP-TB-x terminal base provides connections for the eight
output channels of the FP-AO-200. The cFP-CB-x connector block
provides the same connections for the cFP-AO-200.
Table 1 lists the terminal assignments for the signals associated
with each channel.
Table 1. Terminal Assignments
Terminal Numbers
Channel
0 1 2, 18 17
1 3 4, 20 19
2 5 6, 22 21
3 7 8, 24 23
4 9 10, 26 25
5 11 12, 28 27
6 13 14, 30 29
7 15 16, 32 31
I
out
COM
V
sup
Each channel has an output terminal, I
COM; and a supply terminal, V
sup
; a common terminal,
out
. The COM terminals of all
the channels are connected internally to each other and to the
C terminals, and the V
terminals are all connected to each other
sup
and to the V terminals. Refer to the sections that follow for detailed
wiring instructions.
Sourcing Current to a Load
The [c]FP-AO-200 sources current from an external loop supply to
a load. The [c]FP-AO-200 can operate with an external loop supply
from 5 to 24 VDC. The voltage from the external supply
determines the maximum load impedance that the [c]FP-AO-200
can drive. With a 24 VDC loop supply, each output can drive up to
1kΩ of load impedance. With a 5 VDC loop supply, each output
can only drive up to 100 Ω. The [c]FP-AO-200 detects and reports
error conditions due to excessive loads or insufficient loop
supplies. For more information, refer to the Open-Loop Detection
section.
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The [c]FP-AO-200 updates the output channels as new values are
sent to it by the network module. The time it takes to respond to a
change on a single channel is between 3 and 6 ms. The response
time to changes on all eight channels is 24 to 27 ms.
Figure 3 shows the current output circuit of a single channel.
V
V
sup
Open Loop
Indicator
I
out
COM
COM
12-Bit
Isolated DAC
Current
Sense
C
Figure 3. [c]FP-A0-200 Current Output Circuit
Figure 4 shows how to connect loads to two channels of the
[c]FP-AO-200.
+
Loop
Supply
VC
–
I
out
Load
Load
[c]FP-AO-200
COM
I
out
COM
Figure 4. Connecting to Two Channels
© National Instruments Corp. 5 FP-AO-200 and cFP-AO-200
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Using an external COM connection may be more convenient in
your application than using the COM and C terminals on the
terminal base or connector block. Figure 5 shows how to connect
to two channels using an external COM connection.
Load
+
Supply
–
Loop
C
V
I
out
COM
I
out
COM
[c]FP-AO-200
Figure 5. Connecting to Two Channels Using an External COM Connection
Load
Output Ranges
You can configure each channel independently for an output range
of either 0–20 mA or 4–20 mA. The default power-up setting for
each channel is 0–20 mA, with the output set to 0 mA. The
[c]FP-AO-200 has overranging of 0.5 mA in each of these ranges,
so that the actual full-scale ranges available are 0–20.5 mA and
3.5–20.5 mA. Overranging enables the [c]FP-AO-200 to
compensate for span and offset errors in field devices.
Open-Loop Detection
Each channel has a monitoring circuit that compares the actual
output current to the specified output current. If the [c]FP-AO-200
cannot source the specified output current for one or more
channels, the monitoring circuits turn on a red STATUS LED for
each affected channel and report the error condition to the network
module. Generally, the error condition is caused by an open current
loop—either the load device or the loop supply is disconnected.
However, the monitoring circuit also detects errors caused by load
impedances that are too high and by loop supply voltages that are
too low.
If the output of a [c]FP-AO-200 channel is set to 0 mA, the
monitoring circuit does not register an error condition because the
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[c]FP-AO-200 can always source zero current, even to an open
loop. Leave any unused and unwired channels in the default state
so that they do not generate error conditions.
Short-Circuit Protection
Each I
circuits to any of the other terminals. One or more channel outputs
can be short-circuited indefinitely without causing damage or
improper operation of other channels, as long as the maximum
loop supply does not exceed 24 VDC. The outputs can withstand
indefinite short circuits with loop supplies of more than 24 VDC
(up to 36 VDC) without damage, but increasing internal
temperatures due to such conditions may cause improper operation
of other channels on the module.
terminal of the [c]FP-AO-200 is protected against short
out
Status Indicators
Figure 6 shows the [c]FP-AO-200 status indicators.
Figure 6. Status Indicators
The [c]FP-AO-200 has two green status LEDs, POWER and
READY. After you insert the [c]FP-AO-200 into a terminal base or
backplane and apply power to the connected network module, the
green POWER indicator lights and the [c]FP-AO-200 informs the
network module of its presence. When the network module
recognizes the [c]FP-AO-200, it sends initial configuration
information to the [c]FP-AO-200. After receiving this initial
information, the green READY indicator lights and the
[c]FP-AO-200 is in normal operating mode.
In addition to the green POWER and READY indicators, each
channel has a red, numbered error status indicator. For more
information, refer to the Open-Loop Detection section.
Upgrading the FieldPoint Firmware
You may need to upgrade the FieldPoint firmware when you add
new I/O modules to the FieldPoint system. For information on
determining which firmware you need and how to upgrade, go to
ni.com/info and enter fpmatrix.
© National Instruments Corp. 7 FP-AO-200 and cFP-AO-200
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Isolation and Safety Guidelines
Caution Read the following information before
attempting to connect the [c]FP-AO-200 to any circuits
that may contain hazardous voltages.
This section describes the isolation of the [c]FP-AO-200 and its
compliance with international safety standards. The field wiring
connections are isolated from the backplane and the inter-module
communication bus. The isolation is provided by the module,
which has optical and galvanic isolation barriers designed and
tested to protect against transient fault voltages of up to 2,300 V
Follow these guidelines to ensure a safe total system:
• The [c]FP-AO-200 has a safety isolation barrier between the
I/O channels and the inter-module communication bus. There
is no isolation between channels unless otherwise noted. If any
of the channels on a module are wired at a hazardous potential,
make sure that all other devices or circuits connected to that
module are properly insulated from human contact.
•Do not share the external supply voltages (the V and C
terminals) with other devices (including other FieldPoint
devices), unless those devices are isolated from human contact.
• For Compact FieldPoint, you must connect the protective earth
(PE) ground terminal on the cFP-BP-x backplane to the system
safety ground. The backplane PE ground terminal has the
following symbol stamped beside it: . Connect the
backplane PE ground terminal to the system safety ground
using 14 AWG (1.6 mm) wire with a ring lug. Use the 5/16 in.
panhead screw shipped with the backplane to secure the ring
lug to the backplane PE ground terminal.
• As with any hazardous voltage wiring, make sure that all
wiring and connections meet applicable electrical codes and
commonsense practices. Mount terminal bases and backplanes
in an area, position, or cabinet that prevents accidental or
unauthorized access to wiring that carries hazardous voltages.
• Operate the [c]FP-AO-200 only at or below Pollution
Degree 2. Pollution Degree 2 means that only nonconductive
pollution occurs in most cases. Occasionally, however, a
temporary conductivity caused by condensation must be
expected.
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.
FP-AO-200 and cFP-AO-200 8 ni.com
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• Refer to the FieldPoint product label for regulatory
certification under hazardous location standards. If the
FieldPoint product is not certified for operation in hazardous
locations, do not operate it in an explosive atmosphere or
where there may be flammable gases or fumes.
Specifications
These specifications are typical for the range –40 to 70 °C unless
otherwise noted.
Output Characteristics
Number of channels .........................8 single-ended
Resolution ........................................12 bits, 1 in 4,096
(~6 µA/bit)
Current Output
Output range .....................................0–20 or 4–20 mA,
Type ..................................................Current source, external loop
External loop power..........................5–24 VDC
Internal voltage drop.........................3 V
Resistive load....................................Up to 1 kΩ with 24 V
Protection..........................................Short-circuit and
Default power-up state......................0 mA
programmable (0–20.5
or 3.5–20.5 mA with
overranging)
power required
loop supply, up to 100 Ω
with 5 V supply
1
open-circuit
Accuracy
Absolute accuracy.............................0.1% typ, 0.3% max
1
Maximum load resistance = (Supply voltage – Internal voltage drop)/0.0205 A
© National Instruments Corp. 9 FP-AO-200 and cFP-AO-200
(calculated as a percentage
of full-scale reading)
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Monotonicity1...................................Guaranteed over operating
temperature range
Offset temperature coefficient .......... 50 nA/°C
Gain temperature coefficient ............40 ppm/°C
Dynamic Characteristics
Max conversion rate..........................200 updates/s
Slew rate ...........................................0.4 mA/µs
Physical Characteristics
Indicators ..........................................Green POWER and
Weight
FP-AO-200 .................................140 g (4.8 oz)
cFP-AO-200 ...............................110 g (3.7 oz)
READY indicators, 8 red
open-loop indicators
Power Requirements
Power from network module ............350 mW
Isolation Voltage
Channel-to-channel isolation............No isolation between
Transient overvoltage........................2,300 V
channels
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Environmental
FieldPoint modules are intended for indoor use only. For outdoor
use, FieldPoint modules must be mounted inside a sealed
enclosure.
Operating temperature ......................–40 to 70 °C
Storage temperature..........................–55 to 100 °C
Humidity...........................................10 to 90% RH,
Maximum altitude.............................2,000 m
Pollution Degree ..............................2
noncondensing
1
A characteristic of a DAC in which the analog output always increases as the value
of the digital code input to it increases.
FP-AO-200 and cFP-AO-200 10 ni.com
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Shock and Vibration
Operating shock (IEC 68-2-27)
cFP-AO-200
................................50 g, 3 ms half sine, 3 shocks;
30 g, 11 ms half sine,
3 shocks
Operating vibration, random (IEC 60068-2-34)
FP-AO-200 .................................10–500 Hz, 2.2 g
cFP-AO-200 ...............................10–500 Hz, 5 g
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Operating vibration, sinusoidal (IEC 60068-2-6)
[c]FP-AO-200.............................10–500 Hz, 5 g
Safety
The [c]FP-AO-200 is designed to meet the requirements of the
following standards for safety and electrical equipment for
measurement, control, and laboratory use.
• EN 61010-1, IEC 61010-1
• UL 3121-1
• CAN/CSA C22.2 No. 1010.1
For certifications under regulatory standards, including hazardous
location standards, refer to the product label or to
ni.com.
Electromagnetic Compatibility
CE, C-Tick, and FCC Part 15 (Class A) Compliant
Electromagnetic emissions ...............EN 55011 Class A at 10 m
Electromagnetic immunity................Evaluated to EN 61326:
FCC Part 15A above 1 GHz
1997/A1: 1998, Table 1
Note For full EMC compliance, you must operate this
device with shielded cabling. See the Declaration of
Conformity (DoC) for this product for any additional
regulatory compliance information. To obtain the DoC
for this product, click Declaration of Conformity at
ni.com/hardref.nsf/.
© National Instruments Corp. 11 FP-AO-200 and cFP-AO-200
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Mechanical Dimensions
Figure 7 shows the mechanical dimensions of the FP-AO-200
installed on a terminal base. Dimensions are given in millimeters
[inches]. If you are using the cFP-AO-200, refer to the Compact
FieldPoint controller user manual for the dimensions and cabling
clearance requirements of the Compact FieldPoint system.
107.19
[4.22]
109.5
[4.31]
91.44
[3.60]
Figure 7. FP-AO-200 Mechanical Dimensions
Where to Go for Support
For more information about setting up the FieldPoint system, refer
to these National Instruments documents:
• FieldPoint network module user manual
• Other FieldPoint I/O module operating instructions
• FieldPoint terminal base operating instructions
ni.com/support for the most current manuals, examples,
Go to
and troubleshooting information.
For telephone support in the United States, create your service
request at
512 795 8248. For telephone support outside the United States,
contact your local branch office:
Australia0398795166, Austria06624579900,
Belgium 02 757 00 20, Brazil 55 11 3262 3599,
Canada (Calgary) 403 274 9391, Canada (Montreal) 514 288 5722,
Canada (Ottawa) 613 233 5949, Canada (Québec) 514 694 8521,
Canada (Toronto) 905 785 0085, China 86 21 6555 7838,
Czech Republic 02 2423 5774, Denmark 45 76 26 00,
Finland 09 725 725 11, France 01 48 14 24 24,
Germany 089 741 31 30, Greece 01 42 96 427,
Hong Kong 2645 3186, India 91 80 4190000,
Israel 03 6393737, Italy 02 413091, Japan 03 5472 2970,
ni.com/ask and follow the calling instructions or dial
FP-AO-200 and cFP-AO-200 12 ni.com
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Korea 02 3451 3400, Malaysia 603 9596711,
Mexico 001 800 010 0793, Netherlands 0348 433466,
New Z ealand 0 9 914 0488, Norway 32 27 7 3 00, Polan d 22 3390 150,
Portugal 210 311 210, Russia 095 238 7139,
Singapore 65 6 226 5886, Slovenia 3 425 4200,
South Africa 11 805 8197, Spain 91 640 0085,
Sweden 08 587 895 00, Switzerland 056 200 51 51,
Taiwan 02 2528 7227, United Kingdom 01635 523545
© National Instruments Corp. 13 FP-AO-200 and cFP-AO-200
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