NI FieldPoint FP-DO-400 User manual

FieldPoint ™is a trademark of National Instruments Corporation. Product and company names
mentioned herein are trademarks or trade names of their respective companies.
321681B-01 ©Copyright 1997, 1999 National Instruments Corp. All rights reserved. June 1999
OPERATING INSTRUCTIONS
FP-DO-400
8-Channel, 5 to 30 V Discrete
Output Module
These operating instructions describe the installation, features, and
characteristics of the FP-DO-400. For details on configuring and
accessing the FP-DO-400 over a network, refer to the user manual
for the particular FieldPoint network module you are using with
the FP-DO-400.
Features
The FP-DO-400 is a FieldPoint discrete output module with the
following features:
• Eight discrete output channels
• Sourcing outputs supply 2 A per channel, 9 A2per module
• Compatible with voltages from 5 to 30 VDC
• On/Off LED indicators
• Hot plug and play operation
• 3,000 V input to output isolation
• Double insulated for 250 V safe working voltage
• –40 to +70 °C operation
Installation
The FP-DO-400 mounts on a FieldPoint terminal base (FP-TB-xx)
unit. The hot plug and play operation of the FP-DO-400 allows you
to install it onto a powered terminal base without disturbing the
operation of other modules or terminal bases. The FP-DO-400
receives operating power from the terminal base.

FP-DO-400 2 www.natinst.com
To install the FP-DO-400, refer to Figure 1 and follow these steps:
1. Slide the terminal base key to either position X (used for any
module) or position 4 (used for the FP-DO-400 module).
2. Align the FP-DO-400 alignment slots with the guide rails on
the terminal base.
3. Press firmly to seat the FP-DO-400 on the terminal base. The
terminal base latch locks the FP-DO-400 into place when it is
firmly seated.
Figure 1. Module Installation Diagram
Field Wiring
Theterminalbaseprovidesconnectionsforeach of the eightoutput
channels and an external supply to power field devices. Although
the external supply is not needed for the internal operation of the
FP-DO-400, the outputs source current from this external supply.
You may connect an external supply to power field devices by
connecting to the V and C terminals of the terminal base. Each
channel has one output terminal, Vout; a common terminal, COM
(internally connected to the C terminal); and a supply terminal,
Vsup (internally connected to the V terminal). If the total current
supplied by the channels of the FP-DO-400 is more than 5 A, route
the external supply to the Vsup terminals of individual channels.
Otherwise, the external supply may simply be connected to the V
and C terminals. Figures 2a and 2b show examples ofbasic wiring
connections.
Alignment
Slot
Key
Latch
Guide Rails
Terminal BaseI/O Module

© National Instruments Corp. 3 FP-DO-400
Figure 2. Basic Field Connections (Two Channels Shown)
Table 1 lists the terminal assignments for the signals of each
channel.
Table 1. Terminal Assignments
Channel
Terminal Numbers
Vout Vsup COM
0 1 17 2, 18
1 3 19 4, 20
2 5 21 6, 22
3 7 23 8, 24
4 9 25 10, 26
511 27 12, 28
613 29 14, 30
715 31 16, 32
CV Vout
–
+
–
+
COM
a. Total Current Less
Than 5 Amps
Load
Vout
COM Load
CV
Vout
COM
b. Total Current Greater
Than 5 Amps
Load
Vout
Vsup
Vsup
COM
COM
COM
Load

FP-DO-400 4 www.natinst.com
Discrete Output Circuit
The discrete outputs of the FP-DO-400 consist of optically-
isolated sourcing outputs. In the ON state, a transistor is turned on
between the positive external supply voltage (the V and Vsup
terminals) and the output (Vout) terminal. In the OFF state, this
transistor is turned off, allowing only a small leakage current to
flow. Choose the impedance of the loads driven by the output
channels so that the current supplied by any one channel in the ON
state is no more than 2 A, and the total current supplied by all
channels at any one time is no more than 9 A2.
Use the following formula to ensure the total current per module is
not exceeded. Square the current of each channel and add them all
together.The result must be equalto or less than 9 A2. Forexample,
two channels with 2 A and one channel with 1 A ≤ 9 Α2would be
as follows:
(2 A)2+ (2 A)2+ (1 A)2≤ 9 Α2
The outputs must not be short circuited to the potential of the C or
COM terminals (the negative voltage of the external supply). Such
a short circuit would cause many amps of current to flow through
an output and would damage the output. Check all wiring carefully
before applying power.
In the ON state, there is an effective resistance of 0.3 Ohms
between the output (Vout) and the supply voltage (the V and Vsup
terminals). This resistance causes a voltage drop between the
external supply voltage and the output voltage. For example, if the
external supply voltage is 24 V and the output current is 1 A, the
output voltage is 23.7 V: [24 V – (1 A x 0.3 Ω) = 23.7 V].
Note Using a 5 V external supply increases the output
impedence to 2 Ohms. This increase limits the amount of
current each channel can supply.

© National Instruments Corp. 5 FP-DO-400
Figure 3 shows the diagram of one channel’s discrete output
circuit.
Figure 3. Discrete Output Circuit
Status Indicators
Figure 4 shows the module label and status indicators. You can
remove the insertable label to see wiring diagrams for the input
channels.
Figure 4. Status Indicators and Module Label
After the module has been inserted into a terminal base (and power
is applied), the green POWER indicator turns on and the
FP-DO-400 informs the network module of its presence. When
the network module recognizes the FP-DO-400, it sends initial
configuration information to the FP-DO-400. After receiving this
initial information, the green READY indicator turns on and the
FP-DO-400 is in its normal operating mode. In addition to the
green POWER and READY indicators, each channel has a
numbered, green, output state indicator which lights when the
channel is in the ON state.
COM
Vout
Vsup
V
C
Optical
Isolation Load

FP-DO-400 6 www.natinst.com
Isolation and Safety Guidelines
Caution Read the following information before
attempting to connect any circuits which may contain
hazardous voltages to the FP-DO-400.
This section describes the isolation of the FP-DO-400 and its
compliance with international safety standards. The outputs are
isolated from the backplane provided by the terminal base with an
optical isolation barrier designed and tested to provide protection
against fault voltages of up to 3000 Vrms. In addition, the
FP-DO-400 provides double insulation (compliant to UL and
IEC safety standards) 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. You should
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 (as the
FP-DO-400 is) for such an application.
Even when a product like the FP-DO-400 is used in applications
with hazardous potentials, follow these guidelines to ensure a safe
total system.
• The safety isolation of the FP-DO-400 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,
ensure that all other devices or circuits connected to that
module are properly insulated from human contact.
•Donot share the external supply voltages (V and C on the
terminal base) with other devices (including other FieldPoint
devices) unless those devices are also isolated from human
contact.
• As with any hazardous voltage wiring, ensure that all wiring
and connections meet with applicable electrical codes or
common sense practices. Mount terminal bases in an area,
position, or cabinet that prevents accidental or unauthorized
access to wiring with hazardous voltages.
• The isolation of the FP-DO-400 is certified as double insulated
for normal operating voltages of 250 Vrms. Do not use the
FP-DO-400 as the sole isolating barrier between human
contact and working voltages of more than 250 Vrms.

© National Instruments Corp. 7 FP-DO-400
Specifications
These specifications are typical for the range –40 to +70 °C unless
otherwise noted.
Input Characteristics
Number of channels..........................8
Voltage range ....................................5 to 30 VDC
10 to 30 V Voltage Range
Output impedance ......................0.3 Ohm
(0.3 volts drop at 1 A)
Maximum output current............2 A per channel,
9 A2per module
Note Sum of output currents squared must be less than
9A
2. For example, 1 A on all eight channels or 2 A on
two channels.
5 V Voltage Range
Output impedance ......................2 Ohms
Maximum output current............0.67 A per channel,
1.35 A2per module
Note Sum of output currents squared must be less than
1.35 A2. For example, 0.4 A on all eight channels or
0.67 A on three channels.
Output delay times .....................50 µs
Isolation......................................3,000 Vrms
Safety isolation,
working voltage..........................250 Vrms, designed per IEC
1010 as double insulated
Physical
Indicators ..........................................Green POWER and
READY indicators, 8 green
output state indicators
Weight...............................................140 g (4.8 oz.)
Power Requirements
Power from network module ............300 mW

Environment
Operating temperature......................–40 to +70 °C
Storage temperature..........................–55 to +100 °C
Relative humidity..............................5% to 90% non-condensing
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
Mechanical Dimensions
Figure 5 shows the mechanical dimensions of the FP-DO-400
installed onto a terminal base. Dimensions are given in inches
[millimeters].
Figure 5. Mechanical Dimensions
4.31
[109.5]
3.60 [91.44]
4.22 [107.19]