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PAGE 1
DATA SHEET
Form 1120-170913
SNAP POWER SUPPLIES
Features
Built-in fuse, ON/OFF power switch, and LED indicator
Convenient panel mounting; optional DIN-rail mounting
Easy connections
Wide input voltage range
UL approved
Factory Mutual approved (except SNAP-PS5U and
SNAP-PS24U)
DESCRIPTION
SNAP power supplies provide the best source of AC or DC power for
your Opto 22 SNAP PAC hardware. Packaged in a compact and sturdy
housing, SNAP power supplies include a built-in fuse, an LED status
indicator, and an ON/OFF power switch for ease of use.
The SNAP-PS24 and SNAP-PS24U power supplies are designed for
either of two purposes:
•To provide primary power for a SNAP PAC S-series controller
•To provide 24 volts of DC loop power for SNAP analog modules
mounted on a SNAP PAC rack
The SNAP-PS5, SNAP-PS5-24DC, and SNAP-PS5U power supplies
are designed to provide 5 VDC power for a SNAP PAC rack with an I/O
processor (SNAP PAC brain or R-series controller) and I/O modules
mounted on the rack. The combination of a rack, processor, and
modules is called an I/O unit.
Opto 22 recommends using one SNAP power supply for each I/O unit
and for each controller. Choose the power supply based on the load
required for the I/O unit. See the power requirements tables starting
on page 12 for help in determining the power supplies you need.
Additional information on using power supplies can be found in the
Opto 22 technical note Using Power Supplies with Opto 22 Systems
(form #1271, available on our website, www.opto22.com).
All SNAP power supplies except the SNAP-PS5-24DC require AC input
power. The SNAP-PS5U and SNAP-PS24U accommodate a wide range
of AC input voltages, from 100 to 250 VAC.
The SNAP-PS5-24DC DC-to-DC power supply requires a 24 VDC input
and is ideal for systems using DC backup power.
Each SNAP power supply can be mounted in one of two ways: next to
the controller or SNAP I/O unit it powers, using the standard panel-
mounting base, or directly on a DIN rail using the optional 35mm DIN-
rail adapter.
AC or DC input power connections, as required by the model, are
made to a removable terminal strip on top of the power supply. DC
output power is then ready to be hooked up to the controller or rack
using the attached wiring harness.
SNAP power supplies work with Wired+Wireless™ PACs and I/O units
as well as standard wired PACs and I/O.
Notes for legacy hardware: SNAP power supplies are also
compatible with Ethernet-based SNAP Ultimate, SNAP Ethernet, and
SNAP Simple I/O, and with serial-based SNAP I/O units such as those
with a B3000, SNAP-HA, or SNAP-B3000-MODBUS brain.
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>
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Part Numbers
Part Description
SNAP-PS5 SNAP Power Supply
120 VAC input; 5 VDC, 4 A output
SNAP-PS5-24DC SNAP Power Supply
24 VDC input; 5 VDC, 4 A output
SNAP-PS5U SNAP Power Supply
100–250 VAC input; 5 VDC, 5 A output
SNAP-PS24 SNAP Power Supply
120 VAC input; 24 VDC, 3/4 A output
SNAP-PS24U SNAP Power Supply
100–250 VAC input; 24 VDC, 1-1/4 A output
SNAP-PSDIN 35mm DIN-Rail Adapter for SNAP-PS5,
SNAP-PS24, or SNAP-PS5-24DC
SNAP-PSUDIN 35mm DIN-Rail Adapter for SNAP-PS5U or
SNAP-PS24U
SNAP-PS5 power supply
PAGE 2
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DATA SHEET
Form 1120-170913
SPECIFICATIONS
SNAP-PS5 SNAP-PS5-24DC SNAP-PS5U
Input Voltage 95–130 VAC, 47–63 Hz 18–32 VDC 100–250 VAC, 47–63 Hz
Output Voltage 5.1 ±0.1 VDC 5.1 ±0.1 VDC 5.1 ±0.1 VDC
Output Current 4.0 A 4.0 A 5.0 A
Maximum Input Current Draw 0.4 Amps at 120 VAC 1.3 Amps at 24 VDC 0.5 Amps at 120 VAC
Dimensions See the drawings starting on
page 8.
See the drawings starting on
page 8.
See the drawings on
page 10.
Weight 15 oz. (425.25 g) 15 oz. (425.25 g) 1.9 lbs (863.63 g)
Operating Temperature -20 to 70 °C -20 to 70 °C -20 to 70 °C
Storage Temperature -30 to 85 °C -30 to 85 °C -30 to 85 °C
Torque, connector screws 4.5 in-lb (0.51 N-m) 4.5 in-lb (0.51 N-m) 4.5 in-lb (0.51 N-m)
Fuse Opto 22 PN: SNAP-FUSE1AB
Vendor PN: GDC-1A (Bussman)
Opto 22 PN: SNAP-FUSE2AB
Vendor PN: GDB-2A (Bussman) Internal fuse
Agency Approvals FM, UL, ATEX, DFARS FM, UL, CE, ATEX, RoHS,
DFARS UL, CE, RoHS, DFARS
Warranty 30 months 30 months 30 months
SNAP-PS24 SNAP-PS24U
Input Voltage 95–130 VAC, 47–63 Hz 100–250 VAC, 47–63 Hz
Output Voltage 24 ± 0.6 VDC 24 ± 0.1 VDC
Output Current 0.75 A 1.25 A
Maximum Input Current Draw 0.4 Amps @ 120 VAC 0.5 Amps @ 120 VAC
Dimensions See drawings starting on page 8. See drawings on page 10.
Weight 2.1 lbs (952.54 g) 1.9 lbs (863.63 g)
Operating Temperature -20 to 70 °C -20 to 70 °C
Storage Temperature -30 to 85 °C -30 to 85 °C
Torque, connector screws 4.5 in-lb (0.51 N-m) 4.5 in-lb (0.51 N-m)
Fuse Opto 22 PN: SNAP-FUSE1AB Vendor
PN: GDC-1A (Bussman) Internal fuse
Agency Approvals FM, UL, CE, RoHS, DFARS UL, CE, RoHS, DFARS
Warranty 30 months 30 months
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© 2006–2017 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
PAGE 3
DATA SHEET
Form 1120-170913
I/O UNIT POWER REQUIREMENTS
The tables starting on page 12 will help you determine the power
supply needs for your system. Copy the power requirements
worksheet and complete one for each distributed I/O unit.
In addition, keep the following power recommendations in mind. For
more help with power supplies, see Opto 22 form #1271, Using Power
Supplies with Opto 22 Systems.
Use a single power supply per rack
In general, we recommend you use an independent, isolated,
regulated power supply locally with each rack. Local isolated supplies
offer these advantages:
•Short supply conductors, which minimize losses
•Power redundancy, so the failure of a single supply causes only a
single rack failure, not a total system failure
•Fewer voltage drops and ground loops (Voltage drops and
subsequent ground loops may occur when power is distributed
over a large system.)
Always use a separate field supply
Use a separate power supply for the field side of the I/O. Using the
rack supply for field actuation and monitoring defeats the isolation
the I/O module offers and therefore increases the chance of a ground
loop within the control system. Additionally, a sudden change of
current on the field side can cause undesirable voltage fluctuations
that may interfere with the controller or I/O unit’s operation.
Power wiring guidelines
•Use one power supply per I/O unit.
•Use one power supply per controller.
•Use 14 AWG wire.
•SNAP power supplies have short wires to minimize voltage drop.
Do not extend the length of the wires.
•If you power multiple I/O units or controllers from one power
supply, use a star wiring topology. Do not daisy-chain power
wiring from one device to the next.
PAGE 4
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DATA SHEET
Form 1120-170913
INSTALLATION
Panel Mounting (standard)
Mount the SNAP power supply in a location where the attached red and black power
wires will reach the “+” and “-” power terminals on the SNAP mounting rack or controller.
Do not extend the wires.
DIN-Rail Mounting (optional)
1. For 35mm DIN-rail mounting, remove the four screws that fasten the panel mounting
base plate to the power supply. Keep screws in a safe place.
2. Remove panel mounting base plate.
3. In place of the panel mounting base plate, use the four screws removed in step 1 to
fasten the DIN-rail adapter (purchased separately) to the power supply.
4. Mount the SNAP power supply on the DIN rail (next to the power connector on the I/
O unit).
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PAGE 5
DATA SHEET
Form 1120-170913
WIRING—PRIMARY POWER SUPPLY
Wiring to a Standalone Controller
1. For a controller, check the controller’s specifications in its data
sheet or user’s guide to make sure you have the correct power
supply for the controller’s requirements.
2. Follow directions in the controller’s user’s guide to wire the power
supply to the controller. The power supply’s red (or white-and-
red) wire is the positive wire; the black (or white-and-black) wire is
the negative wire.
Wiring to a SNAP I/O Unit
1. Using the power terminals on the SNAP mounting rack, attach the
red wire to the “+” terminal and the black wire to the “-” terminal.
2. For the SNAP-PS5 (not illustrated): Using the removable input
power connector on top of the power supply, apply 120 volts AC
power between the two terminals marked “AC.” The ground
terminal should be connected to ground.
3. For the SNAP-PS5-24DC (not illustrated): Using the removable
input power connector on top of the power supply, apply 24 volts
DC power between the two terminals marked “±DC.” The ground
terminal should be connected to ground.
4. For the SNAP-PS5U (illustrated below): Using the removable
input power connector on top of the power supply, apply 100–
250 volts AC power between the two terminals marked “AC.” The
ground terminal should be connected to ground.
PAGE 6
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DATA SHEET
Form 1120-170913
WIRING—LOOP POWER SUPPLY
1. Mount the SNAP-PS24 or SNAP-PS24U power supply in a location
where the attached output power wires will reach the field
connector for SNAP analog modules or the terminal strip on SNAP
mounting racks that have the additional field wiring terminal
strips.
2. The white-and-red wire is the positive wire (24 VDC). The white-
and-black wire is the negative wire (24 VDC return). For specific
loop power wiring information, see Opto 22 forms #1065 and
#1066 if wiring directly to the field connectors on SNAP analog
modules (see Figure 1 below), or refer to form #0784 for SNAP
racks that have the additional field wiring terminal strip (see
Figure 2). See the next page for similar SNAP-PS24U wiring
diagrams.
3. Using the removable input power connector on top of the power
supply, apply 120 volts of AC power between the two terminals
marked “AC.” The ground terminal should be connected to
ground.
Figure 1. SNAP-PS24 Used as a Loop Supply with the SNAP PAC System
This diagram shows the SNAP-PS24 used as the loop supply and a SNAP-PS5 used as the primary power supply.
Figure 2. SNAP-PS24 Used as a Loop Supply with Legacy Hardware
The SNAP-PS24 is used as the loop supply; a SNAP-PS5 is used as the primary power supply.
OPTO 22 • 800-321-6786 • 1-951-695-3000 • www.opto22.com • sales@opto22.com
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PAGE 7
DATA SHEET
Form 1120-170913
WIRING—LOOP SUPPLY (CONTINUED)
Figure 1. SNAP-PS24U Used as a Loop Supply with the SNAP PAC System
This diagram shows the SNAP-PS24U used as the loop supply and a SNAP-PS5U used as the primary power supply.
Figure 2. SNAP-PS24U Used as a Loop Supply with Legacy Hardware
The SNAP-PS24U is used as the loop supply; a SNAP-PS5U is used as the primary power supply.
PAGE 8
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DATA SHEET
Form 1120-170913
DIMENSIONS—SNAP-PS5, SNAP-PS24, AND SNAP-PS5-24DC
Panel Mount
The length of the red and black leads is 8.00 inches +/- .50 inches.
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PAGE 9
DATA SHEET
Form 1120-170913
DIMENSIONS—SNAP-PS5, SNAP-PS24, AND SNAP-PS5-24DC
With DIN-Rail Adapter
PAGE 10
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DATA SHEET
Form 1120-170913
DIMENSIONS—SNAP-PS5U AND SNAP-PS24U
Panel Mount
SNAP-PS5U is shown; SNAP-PS24U has the same dimensions.
The length of the red and black leads is 9.00 inches +/- .50 inches.
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PAGE 11
DATA SHEET
Form 1120-170913
DIMENSIONS—SNAP-PSDIN
DIMENSIONS—SNAP-PSUDIN
PAGE 12
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DATA SHEET
Form 1120-170913
POWER REQUIREMENTS TABLES
Opto 22 recommends using one power supply per I/O unit and one power supply per controller. See “I/O Unit Power
Requirements” on page 3 for additional information.
To determine power requirements for products not listed in these tables, see the data sheets for the individual products.
MPORTANT NOTE: For a SNAP-PS5 or a SNAP-PS5-24DC power supply, the total power required must not exceed 4 amps.
For a SNAP-PS5U, the total power required must not exceed 5 amps.
Controller Power Requirements
I/O Processor (Brain or On-the-Rack Controller) Power Requirements
(Continued on following page)
Standalone Controller or adapter card Power Req (VDC) Power Req. (Amps)
SNAP PAC S-series controllers (wired) 8–32 VDC* 10 VA**
Wired+Wireless S-series PACs 8–32 VDC 11.3 VA
Legacy hardware
SNAP-LCSX or -LCSX-PLUS controller 5 VDC 0.500
SNAP-LCM4 controller 5 VDC 1.000
M4-SENET-100 adapter card 5 VDC 1.000
M4SARC adapter card 5 VDC 0.200
M4DUALARC adapter card 5 VDC 0.150
M4SARCF adapter card 5 VDC 0.250
M4SARCFR adapter card 5 VDC 0.350
* SNAP-PAC-S1 controllers with serial numbers below 500,000 use 8–24 VDC.
** Uses 1 A if powered at 10V. To determine amps required, divide 10 by the number of
volts applied. Example: 10 / 24 V = 0.417 A (24 VDC input requires 0.417 A)
Processor (Brain or Rack-mounted Controller) Power Req. (Amps)*
SNAP PAC R-series controllers (all wired models) 1.200
SNAP PAC R-series controllers (Wired+Wireless) 1.500
SNAP PAC EB and SB brains (all wired models) 0.750
SNAP PAC EB brains (Wired+Wireless) 1.000
Legacy hardware
SNAP Ultimate controller/brains (all models) 1.000
SNAP Ethernet brains 0.800
SNAP Simple I/O brains 0.500
B3000 (serial SNAP brain)
SNAP-D64RS 0.500
SNAP-B3000-Modbus
SNAP ARCNET brains 1.000
SNAP-B4
SNAP-B6
1.000
1.500 if terminated
*Current from 5-volt supply
PAGE 13
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DATA SHEET
Form 1120-170913
POWER REQUIREMENTS TABLES (CONTINUED)
I/O Unit (Processor, Rack, I/O Modules) Power Requirements Worksheet
Item Quantity X Power
Req. (Amps)
Total Power
Required (Amps)1
SNAP processor (Enter Amps from Processor Power Require-
ments table) 1
SNAP-IDC5-SW digital input module
SNAP-IDC5-SW-NC digital input module
SNAP-AITM-8 analog input module4
Isolated analog input and output modules (part numbers ending
in -i or iSRC) except SNAP-AITM-4i
0.200
All other 4-channel digital input and output modules except
mechanical relay outputs (not high-density digital modules) 0.050
SNAP mechanical power relay output modules40.160
SNAP-AICTD, AICTD-43 analog input modules
High-density digital input and output modules4
SNAP-AIMA-32, SNAP-AIMA-iH4, SNAP-AIV-32, and SNAP-
AITM-4i analog input modules4
All analog output modules except SNAP-AOA-iSRC and
SNAP-AOD-29-HFi
0.150
SNAP-AOD-29-HFi 0.300
SNAP-AIPM power monitoring module3
SNAP-AIPM-3, SNAP-AIPM-3V power monitoring modules40.100
SNAP-AILC and AILC-2 load cell modules30.120
SNAP-AIRTD-8U analog input module40.135
SNAP-AIARMS analog input module
SNAP-AIVRMS analog input module
SNAP-AICTD-84 analog input module
SNAP-AIMA, AIMA-43, and AIMA-84 analog input modules
SNAP-AITM and AITM-2 analog input modules
SNAP-AIMV-43 and AIMV2-43 analog input modules
SNAP-AIV, AIV-43, and AIV-84 analog input modules
0.170
SNAP-AIRTD analog input module
SNAP-AIR40K-43 analog input module
SNAP-AIR400K-84 analog input module
SNAP-AIRATE analog input module
0.190
SNAP-AIRATE-HFi analog input module 0.210
SNAP-SCM-ST2 and SNAP-SCM-SSI serial modules40.200
SNAP-SCM-232, SNAP-SCM-485-422, SNAP-SCM-PROFI3
SNAP-SCM-MCH16 not powering a breakout board20.250
SNAP-SCM-MCH16 powering a breakout board20.700
Total
1 Current from 5-volt supply
2 Can be used with SNAP PAC R-series controllers and SNAP PAC brains, SNAP Simple, and SNAP Ultimate
3 Can be used with SNAP PAC R-series controllers and SNAP PAC brains, SNAP Simple, SNAP Ethernet, and
SNAP Ultimate
4 Can be used with SNAP PAC systems only
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© 2012–2017 Opto 22. All rights reserved. Dimensions and specifications are subject to change. Brand or product names used herein are trademarks or registered trademarks of their respective companies or organizations.
More about Opto 22
Form 1335-170413
PRODUCTS
Opto 22 develops and manufactures reliable, easy-to-use, open
standards-based hardware and software products used worldwide.
Industrial automation, process control, building automation, industrial
refrigeration, remote monitoring, data acquisition, and Industrial
Internet of Things (IIoT) applications all rely on Opto 22.
groov
Monitor and control your
equipment from anywhere using
your smartphone or tablet with
groov. Build your own mobile app
easily—just drag, drop, and tag. No
programming or coding. Visit
groov.com for more information
and your free trial.
SNAP PAC System
Developer- and IIoT-ready, the SNAP PAC System connects physical
assets to databases and applications using open standards. The SNAP
PAC System consists of four integrated components:
• SNAP PAC controllers
•PAC Project
™ Software Suite
•SNAP PAC brains
•SNAP I/O
™
SNAP PAC Controllers
SNAP PAC programmable automation
controllers handle a wide range of digital,
analog, and serial functions for data collection,
remote monitoring, process control, and
discrete and hybrid manufacturing.
For IIoT applications and easier integration with company systems,
standalone and rack-mounted SNAP PACs include a built-in HTTP/
HTTPS server and RESTful API (application program interface). The
REST API gives you secure, direct access to I/O and variable data using
your choice of programming languages. No middleware, protocol
converters, drivers, or gateways needed.
Based on open Ethernet and Internet Protocol (IP) standards, SNAP
PACs make it easier to build or extend a system without the expense
and limitations of proprietary networks and protocols.
PAC Project Software Suite
Opto 22’s PAC Project Software Suite offers full-featured, cost-effective
control programming, HMI (human machine interface), OPC server,
and database connectivity software.
Control programming includes both easy-to-learn flowcharts and
optional scripting. Commands are in plain English; variables and
I/O point names are fully descriptive.
PAC Project Basic offers control and HMI tools and is free for download
on our website, www.opto22.com. PAC Project Professional, available
for separate purchase, adds one SoftPAC software-based controller,
OptoOPCServer, OptoDataLink, options for controller redundancy or
segmented networking, and support for legacy Opto 22 serial mistic™
I/O units.
SNAP PAC Brains
While SNAP PAC controllers provide central control and data
distribution, SNAP PAC brains provide distributed intelligence for I/O
processing and communications. Brains offer analog, digital, and serial
functions, including thermocouple linearization, local PID loop
control, watchdog, totalizing, and much more.
SNAP I/O
I/O provides the local connection to sensors and equipment. Opto 22
SNAP I/O offers 1 to 32 points of reliable I/O per module. Analog,
digital, and serial modules are mixed on one mounting rack and
controlled by a SNAP PAC brain or rack-mounted PAC.
QUALITY
Founded in 1974, Opto 22 has established a worldwide reputation for
high-quality products. All are made in the U.S.A. at our manufacturing
facility in Temecula, California.
Because we test each product twice before it
leaves our factory, rather than only testing a
sample of each batch, we can guarantee most
solid-state relays and optically isolated I/O
modules for life.
FREE PRODUCT SUPPORT
Opto 22’s California-based Product Support
Group offers free, comprehensive technical support for Opto 22
products from engineers with decades of training and experience.
Support is available in English and Spanish by phone or email,
Monday–Friday, 7 a.m. to 5 p.m. PST.
Support is always available on our website: how-to videos, user’s
guides, OptoKnowledgeBase, self-training guide, troubleshooting,
and OptoForums. In addition, hands-on training is available for free at
our Temecula, California headquarters, and you can register online.
PURCHASING OPTO 22 PRODUCTS
Opto 22 products are sold directly and through a worldwide network
of distributors, partners, and system integrators. For more information,
contact Opto 22 headquarters at 800-321-6786 (toll-free in the U.S.
and Canada) or 951-695-3000, or visit our website at
www.opto22.com.
