FIELDPOINT™ OPERATING INSTRUCTIONS
AND SPECIFICATIONS
FP-PWM-520 and
cFP-PWM-520
Eight-Channel, 5 V or 10–30 V PWM Output Module
These operating instructions describe how to install and use
the National Instruments FP-PWM-520 and cFP-PWM-520
pulse-width modulation modules (referred to inclusively as the
[c]FP-PWM-520). For details on configuring and accessing the
[c]FP-PWM-520 over a network, refer to the user manual for the
FieldPoint network module you are using.
Features
The [c]FP-PWM-520 is a FieldPoint pulse-width modulation
(PWM) output module with the following features:
•
•
•
•
Eight PWM sourcing output channels
0 to 100% duty-cycle capability with 12-bit resolution
Short-circuit protection for outputs
Outputs source 5 VDC or 10–30 VDC with user-provided
power supply
•
Independent configuration of the output period for each
channel from 1 to 65,535 ms in 1 ms increments
•
•
On/Off LED indicators
250 Vrms CAT II continuous channel-to-ground isolation,
verified by 2,300 Vrms, 5 s dielectric withstand test
•
•
–40 to 70 °C operation
Hot swappable
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Installing the cFP-PWM-520
The cFP-PWM-520 mounts on a Compact FieldPoint backplane
(cFP-BP-x or cFP-180x), which provides operating power to the
module. Installing the cFP-PWM-520 onto a powered backplane
does not disrupt the operation of the bank.
To install the cFP-PWM-520, refer to Figure 2 and complete the
following steps:
1. Align the captive screws on the cFP-PWM-520 with the screw
holes on the backplane. The alignment keys on the
cFP-PWM-520 prevent backward insertion.
2. Press firmly to seat the cFP-PWM-520 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.
4
3
5
2
4
2
1
1
2
3
cFP I/O Module
Captive Screws
cFP Controller Module
4
5
Screw Holes
cFP Backplane
Figure 2. Installing the cFP-PWM-520
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Wiring the [c]FP-PWM-520
The FP-TB-x terminal 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-x connector 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.
Table 1 lists the terminal assignments for the signals of each
channel. Terminal assignments are also listed on the side panel
of the cFP-PWM-520 and under the slide-in card on the front of the
FP-PWM-520. Connect to the terminals using the terminal base,
connector block, or other connectivity accessory.
Table 1. Terminal Assignments
Terminal Numbers
†
*
VOUT
VSUP
Channel
COM
2, 18
0
1
2
3
4
5
6
7
1
3
17
19
21
23
25
27
29
31
4, 20
5
6, 22
7
8, 24
9
10, 26
12, 28
14, 30
16, 32
11
13
15
* Install a 1 A maximum, fast-acting fuse on each VOUT terminal.
†
Install a 2 A maximum, fast-acting fuse on each VSUP terminal.
Use a 5 VDC or 10–30 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 a maximum of 1 A per
channel. Connect 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.
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Install a 2 A maximum, fast-acting fuse between the external
power supply and the VSUP terminal on each channel. Install
a 1 A maximum, fast-acting fuse suitable for the load at the
VOUT terminal. Figure 3 shows fuses where appropriate.
2 A Max
User-Supplied
C
V
Fuse
V
V
SUP
1 A Max
User-Supplied
Fuse
Protected
Sourcing
Output
OUT
5 VDC or
10–30 VDC
External
+
–
Load
COM
COM
Power Supply
[c]FP-PWM-520
Figure 3. Wiring the [c]FP-PWM-520
Caution Maximum output current for the cFP-PWM-520
is lower than 1 A if the module is operating in the
50–70 °C temperature range. Refer to the Specifications
section for more information, and select fuses for the VOUT
terminals accordingly.
Pulse-Width Modulator Output Circuit
The [c]FP-PWM-520 output channels are optically isolated from
the rest of the FieldPoint bank. The channels are sourcing outputs
with short-circuit protection circuitry. Sourcing current means that
the VOUT terminal provides a path to a voltage supply. In the ON
state of the output period, a transistor is turned on between VSUP
and VOUT. In the OFF state, this transistor is turned off, allowing
only a small leakage current to flow.
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In the ON state, the effective resistance between VOUT and VSUP
causes a voltage drop between the external supply voltage and the
output voltage. For example, if the external supply voltage is 5 V
and the output current is 1 A, calculate the output voltage as
follows:
5 V – (1 A × RON) = VOUT
where RON is the ON resistance and VOUT is the output voltage.
Refer to the Specifications section for the value of the ON
resistance.
Short-Circuit Protection
If the protection circuitry detects a short-circuit condition on an
output channel, it disables the output. If the protection circuitry
disables an output that would otherwise be in the ON state, the
status indicator for that channel is still lit, but the output transistor
is turned off.
Detecting a Short-Circuit Condition
To determine whether a channel is in a short-circuit condition,
complete the following steps:
1. In FieldPoint software, set the duty cycle to 100% for the
channel in question. Refer to the Configuring the Output
Channels section for more information about configuring the
duty cycle.
2. Measure the voltage between the VOUT and VSUP terminals for
that channel.
Under normal load conditions, the VOUT-to-VSUP voltage is
less than 1 V when the output is ON continuously. Any voltage
higher than 1 V indicates a short circuit. Typically, the
VOUT-to-COM voltage is almost zero if the protection circuitry
is activated.
Resetting a Channel in a Short-Circuit Condition
To reset a channel in a short-circuit condition, determine the cause
of the condition and disconnect the load from the channel. The
channel resets automatically when the load is removed.
Alternatively, if completely removing the channel load is not
convenient, reset the channel in any of the following ways:
•
In FieldPoint software, set the duty cycle to 0%. The channel
resets immediately.
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•
•
•
Disconnect the external power supply from the
[c]FP-PWM-520.
Remove the [c]FP-PWM-520 from the terminal base or
backplane.
Power off the network module connected to the
[c]FP-PWM-520.
Normal operation can resume after you correct the short-circuit
condition.
Overcurrent Protection
Each output channel on the [c]FP-PWM-520 has circuitry that
protects it from current surges resulting from short circuits.
Whether the module suffers damage from overcurrent conditions
depends on the following factors:
•
•
•
The amount of current through the channel
The amount of time the current is above the current limit
The frequency of current surges
If the level of current through the output terminal is higher than the
guaranteed trip current for the module, the channel trips and goes
into an overcurrent state. In an overcurrent state, the channel turns
off and the module is not damaged. If the level of current through
the output terminal is higher than the minimum possible trip
current and lower than the guaranteed trip current, the state of the
channel is indeterminate and depends on factors such as the current
level, the temperature, and the power supply.
Inrush currents that exist for less than the trip time do not trip the
protection circuitry. Refer to the Specifications section for more
information about the maximum continuous output current, trip
current, and trip time.
Power Supplies and Overcurrent Conditions
If a short circuit occurs, the current through an output terminal can
exceed the current rating for the power supply and the maximum
continuous current for the [c]FP-PWM-520.
If the power supply you are using with the [c]FP-PWM-520 cannot
supply more than the guaranteed trip current, the module may be
damaged if a short circuit occurs.
© National Instruments Corp.
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Configuring the Output Channels
A [c]FP-PWM-520 output channel uses period and duty-cycle
settings to determine when the channel is on or off. To configure
the period, complete the following steps in Measurement &
Automation Explorer (MAX):
1. On the Channel Configuration tab for the [c]FP-PWM-520,
select Period from the Attribute menu.
2. Enter an integer between 1 ms (1 kHz) and 65,535 ms
(0.01525 Hz) in the Value field.
To configure the duty cycle, write to the channel for which you
want to set the duty cycle. The duty cycle is the proportion of time
that the PWM signal is ON over the period.
OnTime
Period
--------------------
Duty Cycle =
× 100
Enter a value from 0 to 100 to set the duty cycle. The duty cycle has
12-bit resolution (4,096 discrete duty-cycle settings).
2
2
V
SUP
1
0
3
3
1
PWM Output
2
On Time
3
Period
Figure 4. Period and Duty Cycle of a PWM Output
Status Indicators
The [c]FP-PWM-520 has two green status LEDs, POWER and
READY. After you insert the FP-PWM-520 onto a terminal base
or the cFP-PWM-520 onto a backplane and apply power to the
connected network module, the green POWER indicator lights
and the [c]FP-PWM-520 informs the network module of its
presence. When the network module recognizes the
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[c]FP-PWM-520, it sends initial configuration information to the
[c]FP-PWM-520. After the [c]FP-PWM-520 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 status LED 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-PWM-520 to any circuits
that may contain hazardous voltages.
This section describes the isolation of the [c]FP-PWM-520 and its
compliance with international safety standards. The field wiring
connections are isolated from the backplane and the inter-module
communication bus. The isolation barriers in the module provide
250 Vrms Measurement Category II continuous isolation, verified
by 2,300 Vrms, 5 s dielectric withstand test. The [c]FP-PWM-520
provides double insulation (compliant with IEC 61010-1) for
working voltages of 250 Vrms1. 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 try to use any isolation product between human-accessible
parts (such as DIN rails or monitoring stations) and circuits that
can be at hazardous potentials under normal conditions, unless the
product is specifically designed for such an application, as is the
[c]FP-PWM-520.
1
Working voltage is defined as the signal voltage plus the common-mode voltage.
Common-mode voltage is the voltage of the module with respect to ground.
© National Instruments Corp.
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Even though the [c]FP-PWM-520 is designed to handle
applications with hazardous potentials, follow these guidelines to
ensure a safe total system:
•
There is no isolation between channels on the
[c]FP-PWM-520. If a hazardous voltage is present on any
channel, all channels are considered hazardous. Make sure that
all other devices and circuits connected to the 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.
•
•
Do not use the [c]FP-PWM-520 as the only isolating barrier
between human contact and working voltages higher than
250 Vrms
.
Operate the [c]FP-PWM-520 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.
•
Operate the [c]FP-PWM-520 at or below Measurement
Category II. Measurement Category II is for measurements
performed on circuits directly connected to the low-voltage
installation. This category refers to local-level distribution,
such as that provided by a standard wall outlet.
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Safety Guidelines for Hazardous Locations
The cFP-PWM-520 is suitable for use in Class I, Division 2,
Groups A, B, C, D, T4 hazardous locations; Class I, Zone 2,
AEx nC IIC T4 and Ex nC IIC T4 hazardous locations; and
nonhazardous locations only. Follow these guidelines if you are
installing the cFP-PWM-520 in a potentially explosive
environment. Failing to follow these guidelines may result in
serious injury or death.
Caution Make sure that all products you use in hazardous
locations are certified for such use. Refer to the product
label or visit ni.com/certification, search by model
number or product line, and click the appropriate link in
the Certification column.
Caution Do not disconnect I/O-side wires or connectors
unless power has been switched off or the area is known
to be nonhazardous.
Caution Do not remove modules unless power has been
switched off or the area is known to be nonhazardous.
Caution Substitution of components may impair
suitability for Class I, Division 2.
Caution For Zone 2 applications, install the Compact
FieldPoint system in an enclosure rated to at least IP 54
as defined by IEC 60529 and EN 60529.
Caution For Zone 2 applications, install a protection
device across the external power supply and the COM
terminal. The device must prevent the external power
supply voltage from exceeding 42 V if there is a transient
overvoltage condition.
Special Conditions for Hazardous Locations Use in Europe
The cFP-PWM-520 has been evaluated as EEx nC IIC T4
equipment under DEMKO Certificate No. 03 ATEX 0251502X.
Each module is marked
hazardous locations.
II 3G and is suitable for use in Zone 2
© National Instruments Corp.
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Specifications
The following specifications are typical for a range of –40 to 70 °C
unless otherwise noted.
Output Characteristics
Number of channels..........................8
Output type .......................................Sourcing
Output voltage ..................................Supply voltage – (Output
current × Output impedance)
Supply voltage ..................................5 VDC or 10 to 30 VDC,
user-provided
Maximum output current per channel
Temperature Ranges
Module
–40 to 50 °C
50 to 60 °C
0.75 A
1 A
60 to 70 °C
0.5 A
cFP-PWM-520
FP-PWM-520
1 A
1 A
1 A
ON resistance
Revision E and later modules1 ...0.15 Ω
Revision D and earlier
modules ......................................0.3 Ω
Pulse-width accuracy........................–1, +3 μs, any period and
duty cycle
Short-Circuit Protection
Minimum trip current
Revision E and later modules.....9 A
Revision D and earlier
modules ......................................1 A
1 The letter in the part number identifies the revision of the module. For example, part
number 185715A-02 identifies a revision A cFP-PWM-520. The part number is
printed on a label on the module. On the FP-PWM-520, the label is on the bottom of
the module. On the cFP-PWM-520, the label is on the back of the module.
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Guaranteed trip current
Revision E and later modules.....12.5 A
Revision D and earlier
modules ......................................20 A
Trip time
Revision E and later modules.....10 μs at 13 A
Behavior (revision E and later modules)
Current Level
0–1 A
Channel Behavior
Module Protection
Channel does not trip
Module is not damaged
1–9 A
Channel does not trip Module may be damaged
9–12.5 A
12.5 A
Channel may trip
Channel trips
Module may be damaged
Module is not damaged
Behavior (revision D and earlier modules)
Current Level
0–1 A
Channel Behavior
Channel does not trip
Channel may trip
Channel trips
Module Protection
Module is not damaged
Module may be damaged
Module is not damaged
1–20 A
≥20 A
Physical Characteristics
Indicators ..........................................Green POWER and
READY indicators,
eight green output state
indicators
Weight
FP-PWM-520 .............................140 g (4.9 oz)
cFP-PWM-520 ...........................110 g (3.9 oz)
© National Instruments Corp.
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Mechanical Dimensions
Figure 5 shows the mechanical dimensions of the FP-PWM-520
installed on a terminal base. If you are using the cFP-PWM-520,
refer to your Compact FieldPoint controller user manual for the
dimensions and cabling clearance requirements of the Compact
FieldPoint system.
107.19 mm
(4.22 in.)
109.5 mm
(4.31 in.)
91.44 mm
(3.60 in.)
Figure 5. FP-PWM-520 Mechanical Dimensions
Power Requirements
Power from network module ............1 W
Isolation Voltage
Isolation voltage is verified by a dielectric withstand test.
Channel-to-ground isolation
Continuous .................................250 Vrms, Measurement
Category II
Dielectric withstand....................2,300 Vrms, 5 s max
Channel-to-channel isolation............None
Environmental
FieldPoint modules are intended for indoor use only. For outdoor
use, they must be mounted inside a sealed enclosure.
Operating temperature ......................–40 to 70 °C
Storage temperature..........................–55 to 85 °C
Humidity...........................................10 to 90% RH,
noncondensing
Maximum altitude.............................2,000 m
Pollution Degree ...............................2
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Shock and Vibration
These specifications apply only to the cFP-PWM-520.
NI recommends Compact FieldPoint if your application is
subject to shock and vibration.
Operating vibration, random
(IEC 60068-2-64)..............................10–500 Hz, 5 grms
Operating vibration, sinusoidal
(IEC 60068-2-6)................................10–500 Hz, 5 g
Operating shock
(IEC 60068-2-27)..............................50 g, 3 ms half sine,
18 shocks at 6 orientations;
30 g, 11 ms half sine,
18 shocks at 6 orientations
Hazardous Locations
U.S. (UL) ..........................................Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
AEx nC IIC T4
Canada (C-UL) .................................Class I, Division 2,
Groups A, B, C, D, T4;
Class I, Zone 2,
Ex nC IIC T4
Europe (DEMKO).............................Ex nC IIC T4
Safety
This product is designed to meet the requirements of the following
standards of safety for electrical equipment for measurement,
control, and laboratory use:
•
•
IEC 61010-1, EN 61010-1
UL 61010-1, CSA 61010-1
Note For UL and other safety certifications, refer to the
product label or visit ni.com/certification, search
by model number or product line, and click the
appropriate link in the Certification column.
© National Instruments Corp.
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Electromagnetic Compatibility
This product is designed to meet the requirements of the following
standards of EMC for electrical equipment for measurement,
control, and laboratory use:
•
•
•
EN 61326 EMC requirements; Industrial Immunity
EN 55011 Emissions; Group 1, Class A
CE, C-Tick, ICES, and FCC Part 15 Emissions; Class A
Note For EMC compliance, operate this device
according to product documentation.
CE Compliance
This product meets the essential requirements of applicable
European Directives, as amended for CE marking, as follows:
•
•
2006/95/EC; Low-Voltage Directive (safety)
2004/108/EC; Electromagnetic Compatibility Directive (EMC)
Note Refer to the Declaration of Conformity (DoC) for
this product for any additional regulatory compliance
information. To obtain the DoC for this product, visit
ni.com/certification, search by model number or
product line, and click the appropriate link in the
Certification column.
Environmental Management
National Instruments is committed to designing and manufacturing
products in an environmentally responsible manner. NI recognizes
that eliminating certain hazardous substances from our products is
beneficial not only to the environment but also to NI customers.
For additional environmental information, refer to the NI and the
Environment Web page at ni.com/environment. This page
contains the environmental regulations and directives with which
NI complies, as well as other environmental information not
included in this document.
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Waste Electrical and Electronic Equipment (WEEE)
EU Customers At the end of their life cycle, all products
must be sent to a WEEE recycling center. For more
information about WEEE recycling centers and
National Instruments WEEE initiatives, visit ni.com/
environment/weee.htm.
˅
RoHS
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(RoHS)
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RoHS
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ni.com/environment/rohs_chinaDŽ
about China RoHS compliance, go to
environment/rohs_china
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ni.com/
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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 and connector block operating
instructions
Go to ni.com/support for the most current manuals, examples,
and troubleshooting information.
For telephone support in the United States, create your service
request at ni.com/ask and follow the calling instructions or dial
512 795 8248. For telephone support outside the United States,
contact your local branch office:
Australia 1800 300 800, Austria 43 662 457990-0,
Belgium 32 (0) 2 757 0020, Brazil 55 11 3262 3599,
Canada 800 433 3488, China 86 21 5050 9800,
Czech Republic 420 224 235 774, Denmark 45 45 76 26 00,
Finland 358 (0) 9 725 72511, France 01 57 66 24 24,
Germany 49 89 7413130, India 91 80 41190000,
Israel 972 3 6393737, Italy 39 02 41309277, Japan 0120-527196,
Korea 82 02 3451 3400, Lebanon 961 (0) 1 33 28 28,
Malaysia 1800 887710, Mexico 01 800 010 0793,
Netherlands 31 (0) 348 433 466, New Zealand 0800 553 322,
Norway 47 (0) 66 90 76 60, Poland 48 22 3390150,
Portugal 351 210 311 210, Russia 7 495 783 6851,
Singapore 1800 226 5886, Slovenia 386 3 425 42 00,
South Africa 27 0 11 805 8197, Spain 34 91 640 0085,
Sweden 46 (0) 8 587 895 00, Switzerland 41 56 2005151,
Taiwan 886 02 2377 2222, Thailand 662 278 6777,
Turkey 90 212 279 3031, United Kingdom 44 (0) 1635 523545
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For patents covering National Instruments products, refer to the appropriate location: Help»Patents in your software,
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