National Instruments FieldPoint FP-DO-400 User manual

FieldPoint™Operating Instructions
FP-DO-400 and cFP-DO-400
Eight-Channel, 5–30 V Digital Output Module
These operating instructions describe how to install and use the
National Instruments FP-DO-400 and cFP-DO-400 digital output
modules (referred to inclusively as the [c]FP-DO-400). For
information about configuring and accessing the [c]FP-DO-400
over a network, refer to the user manual for the FieldPoint network
module you are using.
Features
The [c]FP-DO-400 is a FieldPoint digital output module with the
following features:
• Eight digital output channels
• Sourcing outputs supply up to 1.5 A per channel, 8 A2per
module
• Compatible with voltages from 5 to 30 VDC
• On/Off LED indicators
• 2,300 Vrms transient overvoltage protection
• –40 to 70 °C operation
• Hot swappable
• User-configurable startup states
Installing the FP-DO-400
The FP-DO-400 mounts on a FieldPoint terminal base (FP-TB-x),
which provides operating power to the module. Installing the
FP-DO-400 onto a powered terminal base does not disrupt the
operation of the FieldPoint bank.

FP-DO-400 and cFP-DO-400 2 ni.com
To install the FP-DO-400, 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 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. When
the module is firmly seated, the terminal base latch locks it into
place.
Figure 1. Installing the FP-DO-400
Installing the cFP-DO-400
The cFP-DO-400 mounts on a Compact FieldPoint backplane
(cFP-BP-x), which provides operating power to the module.
Installing the cFP-DO-400 onto a powered backplane does not
disrupt the operation of the FieldPoint bank.
To install the cFP-DO-400, refer to Figure 2 and complete the
following steps:
1. Align the captive screws on the cFP-DO-400 with the holes on
the backplane. The alignment keys on the cFP-DO-400 prevent
backward insertion.
2. Press firmly to seat the cFP-DO-400 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.
Alignment
Slot
Key
Latch
Guide Rails
Terminal BaseI/O Module

© National Instruments Corp. 3 FP-DO-400 and cFP-DO-400
Figure 2. Installing the cFP-DO-400
Wiring the [c]FP-DO-400
The FP-TB-xterminal base has connections for each of the eight
output channels and for an external power supply to power the
output channels and field devices. The cFP-CB-xconnector block
provides the same connections. Each channel has one output
terminal (VOUT), one supply terminal (VSUP), and two common
terminals (COM). All eight channels are referenced to the COM
terminals. The V and VSUP terminals are all internally connected,
as are the C and COM terminals.
1 cFP I/O Module
2 Captive Screws
3 cFP Controller Module
4 Screw Holes
5 cFP Backplane
2
2
1
3 5
4
4

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Use a 5–30 VDC external power supply for the output channels.
The power supply must provide enough current to power all of the
loads on the output channels, up to 1.5 A per channel.1Connect the
external power supply to multiple V and VSUP terminals and to
multiple C and COM terminals as needed to ensure that the
maximum current through any terminal is 2 A or less.
Install a 2 A maximum, fast-acting fuse between the external
power supply and the VSUP terminal on each channel. Install
a 1.5 A maximum, fast-acting fuse suitable for the load at the
VOUT terminal. Figure 3 shows fuses where appropriate.
Figure 3. Recommended Field Connections
Table 1 lists the terminal assignments for the signals of each
channel. Terminal assignments are also listed on the side panel of
the cFP-DO-400 and under the slide-in card on the front of the
FP-DO-400.
1 Refer to the Digital Output Circuit and Specifications sections for the maximum
output current level on all channels.
COM
V
OUT
V
SUP
V
C
[c]FP-DO-400
Load
–
+
5–30 VDC
External Power
Supply
To next channel
2 A max
1.5 A max

© National Instruments Corp. 5 FP-DO-400 and cFP-DO-400
Digital Output Circuit
The [c]FP-DO-400 digital output channels are optically isolated
from the rest of the FieldPoint bank. The channels are sourcing
outputs, which means that the output terminal provides a path to
a voltage supply.
In the ON state, a transistor is turned on between the positive
external supply voltage (V and VSUP) and the output terminal
(VOUT). In the OFF state, this transistor is turned off, allowing only
a small leakage current to flow.
Ensure that the load on any channel does not draw more than 1.5 A,
and the sum of the squares of the total current supplied by all
channels at any time is no more than 8 A2.
To determine whether the total current is within the limit, square
the current on each channel and add the squares together. If the sum
of all the squares is less than or equal to 8 A2, the total current is
within the limit. In the following example, three channels supply
1.5 A each and one channel supplies 1 A:
(1.5 A)2+ (1.5 A)2+ (1.5 A)2+ (1 A)2≤ 8 A2
Table 1. Terminal Assignments
Channel
Terminal Numbers
VOUT1VSUP2COM
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
1Install a 1.5 A maximum, fast-acting fuse on each VOUT terminal.
2Install a 2 A maximum, fast-acting fuse on each V and VSUP terminal.

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Caution The outputs must not be short-circuited to the
potential of the C or COM terminals (the negative voltage
of the external supply). Short circuits damage the
[c]FP-DO-400 output channels. Check all wiring
carefully before applying power.
In the ON state, the effective resistance between the output (VOUT)
and the supply voltage (V and VSUP) is 0.3 Ω. This resistance
causes a voltage drop between the external supply voltage and the
output voltage. Table 2 lists the actual output voltages based on the
voltage provided by the external power supply.
If the external power supply you are using does not provide one of
the voltages in Table 2, use the following equation to calculate the
actual voltage output.
ActualOutput = Vext – (Iflow × 0.3 Ω)
where ActualOutput is the voltage sourced by VOUT
Vext is the voltage provided by the external power supply
Iflow is the current flow through the VOUT terminal
Note Using a 5–10 V external supply increases the
output impedance to 2 Ω. This increase limits the amount
of current each channel can supply. Refer to the
Specifications section for more information.
Table 3 shows some common combinations of output current levels
on several channels. Combinations are valid from –40 to 50 °C for
the cFP-DO-400 and from –40 to 70 °C for the FP-DO-400.
Table 2. [c]FP-DO-400 Output Voltages for a 0.5 A Current Flow
VVOUT
54.85
10 9.85
12 11.85
24 23.85
30 29.85

© National Instruments Corp. 7 FP-DO-400 and cFP-DO-400
Protection for Inductive Loads
When an inductive load, such as a motor or relay, is connected
to an output, a large counter-electromotive force may occur at
switching time because of the energy stored in the inductive load.
This flyback voltage can damage the output and the power supply.
It is best to limit flyback voltages by installing a flyback diode
across an inductive load. Typically, you should mount the flyback
diode within 18 in. of the load. Figure 4 shows one channel
connected to an inductive load with a flyback diode.
Figure 4. Digital Output Circuit (External Power Supply Not Shown)
The [c]FP-DO-400 contains flyback diodes to prevent excessively
high voltage from damaging the module. National Instruments still
recommends using an external protection circuit across any
inductive load.
Table 3. Common Output Configurations
Channel Subset Channel Subset Total A2
8 channels @ 1 A —8 A2
5 channels @ 1.25 A —7.81 A2
4 channels @ 1.25 A 3 channels @ 0.75 A 7.94 A2
3 channels at 1.5 A 1 channel @ 1 A 7.75 A2
COM
V
OUT
V
SUP
V
CFlyback Diode
for Inductive Load
[c]FP-DO-400
Load
1.5 A max

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Status Indicators
Figure 5 shows the status indicator LEDs on the [c]FP-DO-400.
Figure 5. Status Indicators
The [c]FP-DO-400 has two green status LEDs, POWER and
READY. After you install the FP-DO-400 onto a terminal base
or the cFP-DO-400 onto a backplane and apply power to the
connected network module, the green POWER indicator lights
and the [c]FP-DO-400 informs the network module of its presence.
When the network module recognizes the [c]FP-DO-400, it sends
initial configuration information to the [c]FP-DO-400. After the
[c]FP-DO-400 receives this initial information, the green READY
indicator lights and the module is in normal operating mode.
In addition to the green POWER and READY indicators, each
channel has a numbered, green output state indicator that lights
when the channel is in the ON state.
Upgrading Your FieldPoint Firmware
You may need to upgrade your FieldPoint firmware when you add
new I/O modules to your FieldPoint system. For information on
determining which firmware you need and how to upgrade your
firmware, go to ni.com/info and enter fpmatrix.
Isolation and Safety Guidelines
Caution Read the following information before
attempting to connect the [c]FP-DO-400 to any circuits
that may contain hazardous voltages.
This section describes the isolation of the [c]FP-DO-400 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 Vrms.

© National Instruments Corp. 9 FP-DO-400 and cFP-DO-400
Follow these guidelines to ensure a safe total system:
• The [c]FP-DO-400 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.
•Donot 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-xbackplane 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-DO-400 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.
• 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.

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Specifications
These specifications are typical for the range –40 to 70 °C unless
otherwise noted.
Output Characteristics
Number of channels .......................... 8
Output type ....................................... Sourcing
Voltage range .................................... 5–30 VDC
Output impedance at 10–30 V .......... 0.3 Ω
(0.3 V drop at 1 A)
Maximum output current at 10–30 V
Per channel
All channels1
Output impedance at 5–10 V ............2 Ω
Maximum output current at 5–10 V
Per channel ................................. 0.67 A
All channels................................ 1.35 A2
Physical Characteristics
Indicators .......................................... Green POWER and
READY indicators, eight
green output state indicators
Module
Temperature Ranges
–40to50°C 50 to 60 °C 60 to 70 °C
cFP-DO-400 1.5 A 1.0 A 1.0 A
FP-DO-400 1.5 A 1.5 A 1.5 A
1 Refer to the Digital Output Circuit section for more information about the maximum
current across all channels.
Module
Temperature Ranges
–40to50°C 50 to 60 °C 60 to 70 °C
cFP-DO-400 8 A28 A24 A2
FP-DO-400 8 A28 A28 A2