National Instruments FieldPoint FP-AO-210 Manuale utente
FieldPoint
™
is a trademark of National Instruments Corporation. Product and company names
mentioned herein are trademarks or trade names of their respective companies.
322365A-01
©
Copyright 1999 National Instruments Corp. All rights reserved. May 1999
OPERATING INSTRUCTIONS
FP-AO-210
8-Channel, 10 V Analog Output Module
Features
The FP-AO-210 is a FieldPoint analog output module with the
following features:
• Eight 0–10 V outputs
• 0.2 V over-range ability
• 12-bit resolution digital-to-analog converters
• Onboard diagnostics, including current limit indicators
• Hot plug and play operation
• 3,000 Vrms input-to-output isolation
• Double insulated for 250 V safe working voltage
• Up to 1 kOhm load impedance (with optional external power
supply)
• –40 to +70 °C operation
Use this document to install the FP-AO-210 and learn about its
features and characteristics. For more information about
configuring and accessing the FP-AO-210 over a network, refer to
the user manual for the FieldPoint network module you are using
with the FP-AO-210.
Install Your Module
The FP-AO-210 mounts on a FieldPoint terminal base (FP-TB-xx)
unit. Because of its hot plug and play operation, you can install the
FP-AO-210 onto a powered terminal base without disturbing the
operation of other modules or terminal bases. The FP-AO-210
receives operating power from the terminal base.
Operating Instructions 2 www.natinst.com
To install the FP-AO-210, 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-210 module). Using
position 2 helps prevent accidentally inserting the wrong
module onto a terminal base.
2. Align the FP-AO-210 alignment slots with the guide rails on
the terminal base.
3. Press firmly to seat the FP-AO-210 on the terminal base. When
the module is firmly seated, the terminal base latch locks it into
place.
4. Optional: Connect an external power supply to the V and C
terminals of the terminal base. Refer to the section Voltage
Output Circuit for more information.
Figure 1. Module Installation Diagram
Prepare Your Field Wiring
The terminal base provides connections for both an optional
external power supply and for the eight output channels. The
positive terminal of the external power supply is connected to the
V terminal, and the negative (or common) terminal is connected to
the C terminal. Each channel has an output terminal, Vout; a
common terminal, COM (internally connected to the C terminal);
and a supply terminal, Vsup (internally connected to the V
terminal). You can connect either the V or the Vsup terminal to
external power when using devices which require supplementary
power. Figures 2 and 3 show the basic wiring connection. The
connection shown in Figure 2 is capable of sourcing and sinking
Alignment Slot
Key
Latch
Guide Rail
Guide Rail
Terminal BaseFP-AO-210
©
National Instruments Corp. 3 Operating Instructions
1 mA, while the connection shown in Figure 3 is capable of
sourcing 10 mA and sinking 1 mA.
Figure 2. Basic Field Connections (Two Channels Shown)
Figure 3. FP-A0-210 Voltage Output Circuit
Load
requiring up to
1 mA current
Vout
COM
Vout
COM
+
–
+
–
Load
requiring up to
1 mA current
Vsup
Vout
COM
Vsup
Vout
COM
Vin V+
COM
+
–
+
–
Current
Limit
Current
Limit
+
–
CV
3-wire
device
requiring
power
Load
requiring up to
10 mA current
External
15-30 VDC
Supply
Operating Instructions 4 www.natinst.com
Table 1 lists the terminal assignments for the signals of each
channel.
Voltage Output Circuit
The FP-AO-210 output circuit is a current limited voltage source
capable of sourcing (flowing out of the Vout terminal to theload) or
sinking (flowing into the Vout terminal from the load) current. The
FP-AO-210 internal circuitry limits the magnitude of this current
to 1 mA. You can obtain up to 10 mA sourcing current by adding
an optional external power supply. The FP-AO-210 operates with
an external power supply from 15 to 30 VDC.
The FP-AO-210 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.
The FP-AO-210 has several unique features that promote reliable
operation, ease of use, and solid performance. These features are
described below.
Output Range
The FP-AO-210 has an output range of 0–10 V. The factory default
power-up setting for each channel is 0 V. The FP-AO-210 has a
built-in over-range capability of 0.2 V; thus, the actual full-scale
Table 1. Terminal Assignments
Channel
Terminal Numbers
Vout COM Vsup
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
511 12, 28 27
613 14, 30 29
715 16, 32 31
©
National Instruments Corp. 5 Operating Instructions
range of each channel is 0–10.2 V. This extended range allows the
FP-AO-210 to compensate for span and offset errors in field
devices.
Current Limit Detection
Each channel on the FP-AO-210 has a monitoring circuit which
detects the amount of current flowing into (sinking) or out of
(sourcing) the channel. If this value exceeds the maximum
allowable (1 mA with no external supply; 10 mA with external
supply), the circuit lights a red STATUS indicator for each
affected channel, reports the error to the network module, and
adjusts the output voltage so that only the maximum allowed
current flows. The error is reported before the output is adjusted.
The indicator might start to dimly light as the limit is approached.
Over-Voltage Protection
Each FP-AO-210 output terminal Vout is protected against damage
resulting from accidental connection to other channels’ output
terminals. Also, you can connect one or more channel output
terminalsdirectly to anexternalvoltagesourceindefinitelywithout
causing damage or improper operation of other channels, as long
as the maximum voltage does not exceed the range of –10 to
+20 VDC referenced to the C and COM terminals.
Status Indicators
Figure 4 shows the module label and status indicators. To see
wiring diagrams for the output channels, remove the insertable
label.
Figure 4. Status Indicators
Operating Instructions 6 www.natinst.com
After you insert the module into a terminal base (and apply power),
the module runs an internal boot-up sequence and self test. If this
test passes, the green POWER indicator lights and the FP-AO-210
informs the network module of its presence. When the network
module recognizes the FP-AO-210, it sends initial configuration
information to the FP-AO-210. After processing this initial
information, the green READY indicator lights and the
FP-AO-210 is in its normal operating mode. In addition to the
green POWER and READY indicators, each channel has a red,
numbered, error status indicator. For more information about error
status indicators, refer to the section Current Limit Detection in
this document.
Safety Guidelines
Caution Before you attempt to connect ANYcircuits that
may contain hazardous voltages to the FP-AO-210, read
the following information.
This section describes the isolation of the FP-AO-210 and its
compliance with international safety standards. The FP-AO-210
field wiring connections are isolated from the backplane provided
by the terminal base with an optical and galvanic isolation barrier
designed and tested to provide protection against fault voltages of
up to 3,000 Vrms. In addition, the FP-AO-210 provides double
insulation (compliant with IEC 1010-1) for working
common-mode voltages of 250 Vrms. Safety standards (such as
those published by UL and IEC) require the use of double
insulation between hazardous voltages and any human-accessible
parts or circuits.
Never attempt to use any isolation product between human
accessible parts (such as DIN rails or monitoring stations) and
circuits which may be at hazardous potentials under normal
conditions, unless the product is specifically designed for such an
application, as is the FP-AO-210.
When you use a product like the FP-AO-210 in applications with
hazardous potentials, follow these guidelines to make sure your
total system is safe:
• The safety isolation of the FP-AO-210 is from input to output,
not between channels on the same module. 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.
©
National Instruments Corp. 7 Operating Instructions
• Do not share the external power supply voltages (V and C on
the terminal base) with other devices (including other
FieldPoint devices), unless those devices are isolated from
human contact.
• As with any hazardous voltage wiring, make sure that all
wiring and connections meet with applicable electrical codes
and common sense practices. Mount terminal bases in an area,
position, or cabinet that prevents accidental or unauthorized
access to wiring that carries hazardous voltages.
• The isolation of the FP-AO-210 is certified as double insulated
for normal operating voltages of 250 Vrms. Do not use the
FP-AO-210 as the only isolating barrier between human
contact and working voltages of more than 250 Vrms.
Specifications
The following specifications are typical for a range –40 to +70 °C,
unless otherwise noted.
Output Characteristics
Number of channels .........................8 single-ended
Resolution ........................................12 bits, 1 in 4,096
(~2.5 mV/bit)
Isolation ............................................3,000 Vrms, input to output
Safety isolation, working voltage.....250 Vrms channel to earth
ground, designed per
IEC 1010
Voltage Output
Output Range....................................0 to 10 V
(0 to 10.2 V with over range)
Type ..................................................Voltage source, external
power optional
External Power..................................15 to 30 VDC
Current Drive....................................1 mA sourcing or sinking,
10 mA sourcing with
external power supply
Over-Voltage Protection....................–10 to +20 V
Default Power-on state......................0 V
Operating Instructions 8 www.natinst.com
Accuracy
Gain Error.........................................0.2% typical
0.4% maximum
Offset Error.......................................4 mV typical
14 mV maximum
Monotonicity ....................................Guaranteed over temperature
Offset temperature coefficient ..........70 µV/°C
Gain temperature coefficient ............20 ppm/°C
Dynamic Characteristics
Max conversion rate..........................200 Updates/s
Slew rate ..........................................0.5 V/µs
Physical
Indicators ..........................................Green POWER and
READY indicators, 8 red
current limit indicators
Weight...............................................145 g (5.2 oz.)
Power Requirements
Power from network module ............600 mW
Environment
Operating Temperature.....................–40 °C to +70 °C
Storage Temperature.........................–55 °C to + 100 °C
Relative Humidity.............................5% to 90% noncondensing
CE Mark Compliance
This product meets applicable EU directive(s) as follows:
Safety isolation ................................EN 61010 (double insulation
for 250 Vrms working
isolation, installation
category II)
EMC Directive
Immunity....................................EN 50082-1:1994
Emissions ..................................EN 55011:1991 Group I
Class A at 10 meters
©
National Instruments Corp. 9 Operating Instructions
Mechanical Dimensions
Figure 5 shows the mechanical dimensions of the FP-AO-210
installed on a terminal base.
Figure 5. Mechanical Dimensions
4.31
[109.50]
3.60 [91.44]
4.22 [107.19]
in.
[mm]
Indice
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