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© 2001–2019 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 1
DATA SHEET
Form 0784-190731
SNAP B-SERIES RACKS
Features
Secure mounting for SNAP I/O modules plus a SNAP brain or
on-the-rack SNAP controller
Analog, digital, and serial modules on the same rack
Panel or DIN-rail mounting
Modules snap into place
DESCRIPTION
NOTE: For racks to use with SNAP PAC controllers and brains, see
Opto 22 form #1684, the SNAP PAC Racks Data Sheet.
NOTE: M-series racks (such as the SNAP-M64), used with SNAP Simple
brains and SNAP-UP1-M64 controllers, have been replaced by SNAP
PAC racks. See form #1684.
SNAP B-series mounting racks are designed to hold an intelligent
SNAP I/O processor—either a SNAP brain or an on-the-rack
controller—and several I/O modules.
This rack family includes racks that are compatible with ARCNET and
serial SNAP brains, including those using Modbus® and Profibus®
protocols, and with some Ethernet-based SNAP Ultimate I/O™
on-the-rack controllers and SNAP Ethernet I/O™ brains. For specific
processor compatibility, see “Specifications” on page 3.
Since SNAP analog, digital, and serial I/O modules have the same
footprint, customers using most SNAP B-series racks can mix modules
on the same I/O mounting rack. However, module types, features, and
positions on the rack vary depending on the capabilities of the brain
or on-the-rack controller used. See the brain or controller data sheet
for details.
Field devices are wired directly to the top-mounted removable
connectors on the modules plugged into each rack. SNAP B-series
racks can accommodate up to 4, 8, 12, or 16 modules. The module
and rack design allows modules to simply “snap” on and off the
mounting rack.
SNAP racks use a retention rail locking system that holds modules
securely to the rack. Normally, a hold-down screw is not required.
However, for applications that require additional module security,
SNAP racks have provisions for two 4-40 by ½-inch standard machine
screws to hold each module in position.
MC and MC-P model racks provide an auxiliary screw-type terminal
strip for field wiring common connections such as loop power
distribution. MC racks use a fixed terminal strip, while MC-P racks use
removable connectors for easy maintenance (see enlarged view on
the following page).
All SNAP racks offer panel mounting and the option of DIN-rail
mounting. SNAP racks require a 5 VDC power source. SNAP-B4M,
SNAP-B8M, SNAP-B12M, SNAP-B16M, and SNAP-D64RS racks are
Factory Mutual approved.
>
>
>
>
Part Numbers
Part Description
SNAP-B4M* 4-module rack
SNAP-B8M* 8-module rack
SNAP-B12M* 12-module rack
SNAP-B16M* 16-module rack
SNAP-B8MC 8-module rack with extra terminal block for field
wiring
SNAP-B12MC 12-module rack with extra terminal block for field
wiring
SNAP-B16MC 16-module rack with extra terminal block for field
wiring
SNAP-B8MC-P 8-module rack with extra terminal block for field
wiring, pluggable
SNAP-B12MC-P 12-module rack with extra terminal block for field
wiring, pluggable
SNAP-B16MC-P 16-module rack with extra terminal block for field
wiring, pluggable
SNAP-D64RS*
16-module rack for digital-only SNAP Ultimate,
SNAP Ethernet, and SNAP-PDPRS64 Profibus
brains
SNAP-FUSE7.5AB 7.5-amp fuse, 25-pack
SNAP-FUSE4AB 4-amp fuse, 25-pack
SNAP-FUSE1AB 1-amp fuse, 25-pack
SNAP-TEX-DRC10 SNAP PAC rack DIN-rail adapter clip, 10-pack
SNAP-TEX-REC10N Narrow end cap for SNAP PAC racks DIN-rail
assemblies, 10-pack
SNAP-TEX-REC10W Wide end cap for SNAP PAC racks DIN-rail
assemblies with terminal strips, 10-pack
* Factory Mutual (FM) approved
SNAP B-Series Rack
PAGE 2
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DATA SHEET
Form 0784-190731
DESCRIPTION (CONTINUED)
SNAP-B8M (8-Module Position I/O Mounting Rack)
Shown with B3000 brain (purchased separately)
SNAP-B8MC (8-Module Position I/O Mounting Rack)
Shown with B3000 brain (purchased separately)
Pluggable connector
for MC-P models
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PAGE 3
DATA SHEET
Form 0784-190731
SPECIFICATIONS
Part Number Description1Power2
Requirements
I/O Processor3
Compatibility
Replacement
Fuse
Operating
Temperature
Relative
Humidity
SNAP-B4M 4-module mixed
5.0 to 5.2 VDC
@ 1.8 Amps
max
SNAP-UP1-ADS
SNAP-B3000-ENET
SNAP-ENET-RTC
B3000
B3000-HA
SNAP-B4
SNAP-B6
SNAP-BRS
SNAP-BRS-HA
SNAP-B3000-
MODBUS
SNAP-FUSE4A
or Bel5 5HF4
0 to 70 °C
95%,
non-con-
densing
SNAP-B8M 8-module mixed
5.0 to 5.2 VDC
@ 2.6 Amps
max
SNAP-B8MC 8-module mixed,
terminal block
SNAP-B8MC-P 8-module mixed,
pluggable terminal block
SNAP-B12M 12-module mixed4
5.0 to 5.2 VDC
@ 3.4 Amps
max
SNAP-B12MC 12-module mixed4,
terminal block
SNAP-B12MC-P 12-module mixed4,
pluggable terminal block
SNAP-B16M 16-module mixed4
5.0 to 5.2 VDC
@ 4.2 Amps
max
SNAP-B16MC 16-module mixed4,
terminal block
SNAP-B16MC-P 16-module mixed4,
pluggable terminal block
SNAP-D64RS 16-module digital only
(limited digital functions)
5.0 to 5.2 VDC
@ 1.8 Amps
max
SNAP-UP1-D64
SNAP-ENET-D64
SNAP-PDPRS64
SNAP-FUSE1A
or Buss5
GDC1A
1 “Mixed” means the rack can hold analog, digital, and serial modules. Most Ethernet-based I/O processors handle all these types
of modules; other processors do not. See the processor’s data sheet for details.
2 Power requirements shown are for a rack, a processor, and a full load of 2-channel analog modules (for the SNAP-D64RS, a full
load of 4-channel digital modules). Power requirements for other SNAP modules are higher. See module data sheets.
3 “I/O Processor” means a SNAP brain or on-the-rack controller.
4 Four-channel SNAP digital modules can be used in positions 0–7 only.
5 Manufacturer’s part number (not available through Opto 22).
PAGE 4
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DATA SHEET
Form 0784-190731
SPECIFICATIONS (CONTINUED)
MC-P models
only: Pluggable
connector (wire
range 22–14 AWG)
MC and MC-P models only: For detailed
information on terminal strip usage, see page 12
through page 16.
All models: Module mating
connector pinout (female)
All models:
Power schematic
For fuse part numbers,
see Specifications on
page 3.
IMPORTANT: The mounting rack connector has 24 pins;
the module connector has 20 pins. The extra pins on the
mounting rack connector prevent misalignment of the
module during installation.
Extra pins for alignment
Extra pins for alignment
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PAGE 5
DATA SHEET
Form 0784-190731
DIMENSIONAL DRAWINGS
Overall Length Dimensions (SNAP-D64RS and B-series racks with terminal strips)
Part Number Description Width
(inches)
Width
(mm)
Length
(inches)
Length
(mm)
SNAP-B8MC
SNAP-B8MC-P
8-module rack for other brains,
with terminal block 4.41 112.01 9.25 234.95
SNAP-B12MC
SNAP-B12MC-P
12-module rackfor other brains,
with terminal block 4.41 112.01 12.25 311.15
SNAP-B16MC
SNAP-B16MC-P
16-module rackfor other brains,
with terminal block 4.41 112.01 15.25 387.35
SNAP-D64RS 16-module rack, digital only 4.41 112.01 15.25 387.35
Dimensions—SNAP-D64RS Rack and B-Series Racks with Terminal Strips
NOTE: Brain is shown as a sample
for placement only. See page 3
for brain-rack compatibility.
PAGE 6
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© 2001–2019 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.
DATA SHEET
Form 0784-190731
DIMENSIONAL DRAWINGS (CONTINUED)
Overall Length Dimensions (B-series racks without terminal strips)
Part Number Description Width
(inches)
Width
(mm)
Length
(inches)
Length
(mm)
SNAP-B4M 4-module rack 3.91 99.31 6.24 158.41
SNAP-B8M 8-module rack 3.91 99.31 9.24 234.70
SNAP-B12M 12-module rack 3.91 99.31 12.24 310.90
SNAP-B16M 16-module rack 3.91 99.31 15.24 387.10
Dimensions—B-Series Racks Without Terminal Strips
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PAGE 7
DATA SHEET
Form 0784-190731
DIMENSIONAL DRAWINGS (CONTINUED)
SNAP-D64RS Rack and B-Series Racks with Terminal Strips:
Right Side View with DIN-Rail Option Installed
Processor Height* Processor Part Number Rack
4.12 in. (104.6 mm)
SNAP-UP1-ADS
SNAP-B3000-ENET
SNAP-ENET-RTC
B-series
SNAP-UP1-D64
SNAP-ENET-D64 SNAP-D64RS
3.70 in. (95.9 mm)
B3000
SNAP-B4
SNAP-B6
SNAP-BRS
B3000-HA
SNAP-BRS-HA
SNAP-B3000-MODBUS B-series
* Height listed is from the processor’s mounting surface to the highest part of the proces-
sor. Height does not include wiring or cables.
PAGE 8
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© 2001–2019 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.
DATA SHEET
Form 0784-190731
DIMENSIONAL DRAWINGS (CONTINUED)
B-Series Racks Without Terminal Strips:
Right Side View with DIN-Rail Option Installed
Processor Height* Processor Part Number
4.12 in. (104.6 mm) SNAP-UP1-ADS
SNAP-B3000-ENET
SNAP-ENET-RTC
3.70 in. (95.9 mm)
B3000
SNAP-B4
SNAP-B6
B3000-HA
SNAP-BRS
SNAP-BRS-HA
SNAP-B3000-MODBUS
* Height listed is from the processor’s mounting surface to the highest part
of the processor. It does not include wiring or cables.
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PAGE 9
DATA SHEET
Form 0784-190731
MOUNTING
NOTE: If you are not using hold-down screws, the SNAP rack assembly
should be mounted horizontally.
Use the following steps to mount racks as shown in the diagrams on
the next two pages.
Preferred Method: Template
(Product on site)
1. Use SNAP rack mounting extrusion as template.
2. Be sure to use the diagrams on the next two pages to determine
required product and option clearances.
Alternate Method: Prefabrication of Panels
(No product on site)
Mounting holes are in sets of two, located on lower left and upper
right with respect to a center line (CL).
1. Using the diagrams on the next two pages, determine CL1
mounting hole positions. (CL1 is located on the left side of all
SNAP rack mounting extrusions.)
2. Use the center-to-center length specification table below to
determine the offset between center lines and the number of
center line positions for each model.
3. Repeat the process for each center line position.
Center-to-Center Length (All Models)
Part Number Description Center-to-Center
Length
Number of Center
Positions
SNAP-B4M 4-module rack 4.01 in. 2
SNAP-B8M
SNAP-B8MC
SNAP-B8MC-P
8-module rack 3.51 in. 3
SNAP-B12M
SNAP-B12MC
SNAP-B12MC-P
12-module rack 5.01 in. 3
SNAP-B16M
SNAP-B16MC
SNAP-B16MC-P
SNAP-D64RS
16-module rack 4.34 in. 4
PAGE 10
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DATA SHEET
Form 0784-190731
MOUNTING (CONTINUED)
SNAP-D64RS Rack and B-Series Racks with Terminal Strips:
Typical Plain View of SNAP Mounting Extrusion
See instructions and table on page 9.
OPTO 22 • 800-321-6786 • 1-951-695-3000 • www.opto22.com • sales@opto22.com
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PAGE 11
DATA SHEET
Form 0784-190731
MOUNTING (CONTINUED)
B-Series Racks Without Terminal Strips:
Typical Plain View of SNAP Mounting Extrusion
See instructions and table on page 9.
PAGE 12
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DATA SHEET
Form 0784-190731
WIRING DIAGRAMS—B-SERIES MODELS WITH TERMINAL STRIPS
Terminal Strip Usage—Digital
NOTE: Consult the SNAP module
data sheet for your specific
module for additional wiring
information.
Example: Digital Input Using Terminal Strip
Example: Digital AC Output Using Terminal Strip
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PAGE 13
DATA SHEET
Form 0784-190731
WIRING DIAGRAMS—B-SERIES MODELS WITH TERMINAL STRIPS
Terminal Strip Usage—Digital (continued)
NOTE: Consult the SNAP module
data sheet for your specific
module for additional wiring
information.
Example: Digital DC Output (Sourcing) Using Terminal Strip
Example: Digital DC Output (Sinking) Using Terminal Strip
PAGE 14
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DATA SHEET
Form 0784-190731
WIRING DIAGRAMS—B-SERIES MODELS WITH TERMINAL STRIPS
Terminal Strip Usage—Analog
NOTE: Consult the SNAP module
data sheet for your specific
module for additional wiring
information.
Example: Analog Input (Current: Negative) Using Terminal Strip
Example: Analog Input (Current: Positive) Using Terminal Strip
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PAGE 15
DATA SHEET
Form 0784-190731
WIRING DIAGRAMS—B-SERIES MODELS WITH TERMINAL STRIPS
Terminal Strip Usage—Analog (continued)
NOTE: Consult the SNAP module
data sheet for your specific
module for additional wiring
information.
Example: Analog Output (4–20 mA Current: Sinking) Using Terminal Strip
Example: Analog Output (4–20 mA Current: Sourcing) Using Terminal Strip
PAGE 16
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© 2001–2019 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.
DATA SHEET
Form 0784-190731
WIRING DIAGRAMS—B-SERIES MODELS WITH TERMINAL STRIPS
Terminal Strip Usage—Analog (continued)
NOTE: Consult the SNAP module
data sheet for your specific
module for additional wiring
information.
Example: Analog Input (Voltage) Using Terminal Strip
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© 2001–2018 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 1335-181003
PRODUCTS
Opto 22 develops and manufactures reliable, easy-to-use, open
standards-based hardware and software products.
Industrial automation, process control, building automation, industrial
refrigeration, remote monitoring, data acquisition, and industrial
internet of things (IIoT) applications worldwide all rely on Opto 22.
groov EPIC® System
Opto 22’s groov Edge Programmable Industrial Controller (EPIC)
system is the culmination of over 40 years of experience in designing
products for the automation industry.
groov EPIC gives you an industrially hardened system with
guaranteed-for-life I/O, a flexible Linux®-based controller with
gateway functions, and software for your IIoT application or any
application.
groov EPIC I/O
I/O provides the local connection to
sensors and equipment. groov I/O
offers up to 24 channels on each I/O
module, with a spring-clamp terminal
strip, integrated wireway, and swing-
away cover.
Opto 22 I/O is so reliable, we can afford
to guarantee it for life. groov I/O is hot
swappable, UL Hazardous Locations
approved, and ATEX compliant.
groov EPIC Controller
The heart of the system is the groov
EPIC controller. It handles a wide range of digital, analog, and serial
functions for data collection, remote monitoring, process control, and
discrete and hybrid manufacturing.
In addition, the EPIC provides secure data communications among
physical assets, control systems, software applications, online services,
and more, both on premises and in the cloud.
Configuring and troubleshooting I/O and networking is easier with
the EPIC’s integrated high-resolution touchscreen. Authorized users
can see your groov View HMI locally on the touchscreen or on a
monitor connected via the HDMI or USB ports.
groov EPIC Software
Software includes:
•Flowchart-based PAC Control for control programming, or build
your own custom application with optional secure shell access
•groov View for building and viewing your own device-
independent HMI
•Node-RED for creating simple logic flows from pre-built nodes
•Ignition Edge® from Inductive Automation®, with OPC-UA drivers
to Allen-Bradley®, Siemens®, and other control systems, and
MQTT/Sparkplug communications for efficient IIoT data transfer
groov Edge Appliance
Visualization, data handling, and connectivity in a
compact, industrial box: that’s the groov Edge
Appliance. Included are:
•groov View for building and viewing operator
interfaces on PCs and mobile
•Node-RED for building simple logic flows
•Ignition Edge from Inductive Automation, for
OPC-UA drivers and MQTT/Sparkplug IIoT communications
Older products
From solid state relays (our first products) to world-famous G4 and
SNAP I/O, to SNAP PAC controllers, Opto 22 products last a long time.
You can count on us to give you the reliability and service you expect.
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
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, including how-to videos,
user’s guides, the Opto 22 KnowledgeBase, troubleshooting tips, and
OptoForums. In addition, free hands-on training is available 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 +1-951-695-3000, or visit our website at
www.opto22.com.
