SNAP Analog Input Modules
Features
Resolution = 0.004% of nominal range
Two, 4, 8, or 32 single-ended inputs per module
Out-of-range indication
Factory calibrated; no user adjustment necessary
SNAP Analog Input Modules
Description
SNAP I/O analog input modules are part of
Part Number
Opto 22’s SNAP PAC System. All of these
modules mount on a SNAP PAC rack with a
Part
SNAP PAC brain or R-series controller, either
SNAP-AIARMS
a standard wired model or a
Wired+Wireless
™
model.
SNAP-AIMA
A minimum number of SNAP module types
support a full range of analog input
requirements. These software-configurable
modules handle a wide variety of signal
levels. They provide high resolution (0.004%
of nominal range) for precise signal levels, as
well as multiple-channel packaging. All
SNAP analog modules are factory calibrated
and individually tested. Part numbers
ending in -FM are Factory Mutual approved.
SNAP analog input modules have an on-
board microprocessor to provide module-
level intelligence, which makes them an
ideal choice for Original Equipment
Manufacturers (OEMs). For additional
information about the standalone operation
of SNAP analog modules, see Opto 22 form
#0876,
SNAP I/O Module Integration Guide.
Notes for legacy hardware:
Some of these
modules also work with older Opto 22 I/O
processors (brains or on-the-rack
controllers) and M-series or B-series racks. To
check processor compatibility, see the table
on
page 3.
Specifications begin on
page 4.
For
dimensional drawings, see pages
35–45.
IMPORTANT:
Any system using analog
sensors and input modules should be
calibrated annually for analog signals. For
I/O units on a SNAP PAC System, use the PAC
Control
™
commands “Calculate and Set
Offset” and “Calculate and Set Gain.” For
other Ethernet-based I/O units, you can also
SNAP-AIMA-4
SNAP-AIMA-8
SNAP Analog Input Modules
Description
2-channel 0 to 10 amp RMS AC/DC input
2-channel analog current input, -20 to +20 mA
4-channel analog current input -20 to +20 mA
8-channel analog current input -20 to +20 mA
See
page
4
6
6
8
9
11
13
14
18
18
18
20
20
22
23
24
25
26
27
27
29
SNAP-AIMA-32
SNAP-AIMA-32-FM* 32-channel analog current input -20 to +20 mA
SNAP-AIRATE
SNAP-AIR40K-4
SNAP-AIR400K-8
SNAP-AIRTD-1K
SNAP-AIRTD
SNAP-AIRTD-10
SNAP-AICTD
SNAP-AICTD-4
SNAP-AICTD-8
SNAP-AITM
SNAP-AITM-2
SNAP-AITM-8
SNAP-AITM-8-FM*
SNAP-AIVRMS
SNAP-AIV
SNAP-AIV-4
SNAP-AIV-8
SNAP-AIV-32
SNAP-AIV-32-FM*
SNAP-AIMV2-4
SNAP-AIMV-4
2-channel 0–25,000 Hz analog rate input
4-channel analog resistor/thermistor input, 40 K Ohms,
20 K Ohms, 10 K Ohms, or 5 K Ohms
8-channel analog resistor/thermistor input, 400 K Ohms
2-channel 1000 ohm platinum RTD input
2-channel 100 ohm platinum RTD input
2-channel 10 ohm copper RTD input
2-channel analog temperature input, ICTD
4-channel analog temperature input, ICTD
8-channel analog temperature input, ICTD
2-channel analog type E, J, or K thermocouple or -150
to +150 mV input or -75 to +75 mV input
2-channel analog type B, C, D, G, N, T, R, or S thermo-
couple or -50 to +50 mV DC or -25 to +25 mV DC input
8-channel B, C, D, E, G, J, K, N, R, S, or T thermocou-
ple or -75 to +75 mV, -50 to +50 mV, or -25 to +25 mV
input
2-channel 0 to 250 V RMS AC/DC input
2-channel analog voltage input -10 to +10 VDC or -5 to
+5 VDC
4-channel analog voltage input -10 to +10 VDC or -5 to
+5 VDC
8-channel analog voltage input -10 to +10 VDC or -5 to
+5 VDC
32-channel analog voltage input -10 to +10 VDC or -5
to +5 VDC
4-channel -50 to +50 mV input or -25 to +25 mV input
4-channel -150 to +150 mV input or -75 to +75 mV
input
DATA SHEET
Form 1065-140815
30
32
33
* Factory Mutual approved
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2001–2014 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
SNAP Analog Input Modules
use PAC Manager
™
software to calculate and set offset and
gain.
and below zero. An example of this is the SNAP-AIV module,
which has a range of -10 to +10 VDC.
Some modules are considered unipolar, which means the
range starts or ends at zero. For example, the SNAP-AIVRMS
module has a range of 0 to 250 VAC because AC current
cannot be negative.
Isolation
All SNAP analog input modules are isolated from all other
modules and from the SNAP I/O processor. The modules in
this data sheet do not have channel-to-channel isolation,
however. (If you need isolated analog modules, see Opto 22
form #1182.)
Transformer isolation prevents ground loop currents from
flowing between field devices and causing noise that
produces erroneous readings. Ground loop currents are
caused when two grounded field devices share a connection,
and the ground potential at each device is different.
Isolation also protects sensitive control electronics from
industrial field signals.
IMPORTANT:
Since these analog input modules provide
multiple single-ended input channels with a common
reference, the channels are not isolated from each other. (See
Opto 22 form #1182 for isolated modules.)
SNAP Analog Input Modules
Nominal Range and Over-range Limits
All SNAP analog input modules have a nominal range for the
field signal and most support a 10% over-range limit. The
nominal range is the normal range of the field signal for the
module or point configuration. The over-range limit is the
maximum valid field signal the module or point configuration
can read outside of the nominal range. For example, the over-
range limits for the SNAP-AIV are -11 and +11 VDC, and for the
SNAP-AIVRMS, the over-range limit is 275 VAC.
Some modules or point configurations do not support field
signals outside of the nominal range. For example, points
configured as temperature inputs (thermocouple, RTD, ICTD)
do not support over-range readings.
When the field signal is outside of the over-range limits of the
module, the brain will not be able to determine if the value is
too high or too low, so it will return an "out of range" value of -
32768.0
Over-range limits only apply to input modules. Output
modules are limited to their nominal ranges.
Bipolar and Unipolar Input Modules
Most SNAP analog input modules are considered to be
bipolar, which means the range extends equal amounts above
Form 1065-140815
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2001–2014 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
2
DATA SHEET
SNAP Analog Input Modules
Installation
Note module and processor compatibility in the following
table:
Modules
Compatible I/O Processors
The following diagram shows part of a SNAP PAC mounting
rack.
Module connectors
Processor
connector
Module
position zero
Retention bar
32-channel inputs
8-channel inputs SNAP PAC R-series controllers and
SNAP PAC brains, including Wired+Wire-
SNAP-AIRTD-10 less models
SNAP-AIRTD-1K
SNAP PAC R-series controllers and
SNAP PAC brains, including Wired+Wire-
less models
Also the following legacy brains:
SNAP Ethernet, SNAP Simple, SNAP
Ultimate; SNAP-DNP-ASDS; SNAP OEM
SNAP Analog Input Modules
4-channel inputs
SNAP PAC R-series controllers and
SNAP PAC brains, including Wired+Wire-
2-channel inputs less models
(except SNAP-
Also the following legacy brains:
AIRTD-10 and
SNAP Ethernet, SNAP Simple, SNAP
SNAP-AIRTD-1K) Ultimate; SNAP-DNP-ASDS; SNAP OEM;
serial SNAP brains (B3000, Modbus, Pro-
fibus); B3000-HA; B6
1.
All modules can be used with SNAP PAC rac ks and can be
placed in any position on the rack. Two- and four-channel
modules (except the SNAP-AIRTD-10 and SNAP-AIRTD-1K) can
also be used with legacy SNAP M-series and B-series
mounting racks. (For more information on using legacy
hardware, see form #1688, the
SNAP PAC System Migration
Technical Note.)
Modules snap securely into place in the row of connectors on
the mounting rack. Each module connector has a number.
Analog input modules and other types of SNAP I/O modules
are mounted on the module connectors starting at module
position zero.
Modules require a special tool (provided) for removal.
2.
3.
4.
5.
Place the rack so that the module connector numbers
are right-side up, with zero on the left, as shown in the
diagram above. (If your rack has screw connectors, the
screw connectors will be at the bottom.)
Position the module over the module connector,
aligning the small slot at the base of the module with
the retention bar on the rack. When positioning modules
next to each other, be sure to align the male and female
module keys at the tops of the modules before snapping
a module into position.
With the module correctly aligned, push on the module
to snap it into place.
(Optional) Use standard 4-40 x 1/4 truss-head Phillips
hold-down screws to secure both sides of each module.
CAUTION:
Do not over-tighten screws.
Follow the wiring diagrams beginning on
page 4
to
attach modules to the devices they monitor. Most
modules accept 22 to 14 AWG wire; the SNAP-AITM-8
accepts a maximum of two solid 18 AWG wires.
For faster, easier field wiring
installation and maintenance,
use
SNAP TEX
cables and breakout boards. See Opto 22 form
#1756, the
SNAP TEX Cables & Breakout Boards Data Sheet,
for
compatibility and specifications.
DATA SHEET
Form 1065-140815
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2001–2014 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
SNAP Analog Input Modules
0 to 10 Amp RMS AC/DC Input Module
Description
The SNAP-AIARMS module provides an input range of 0 to 10
amps RMS AC/DC. An ideal input is the 5-amp secondary of a
standard current transformer used to monitor AC line current.
Part Number
Description
SNAP-AIARMS Two-channel 0 to 10 amp RMS AC/DC input
Specifications
Input Range
Input Over-Range
Input Resistance
Maximum Input
Accuracy (AC)
Resolution
DC Reversal
Input Response Time
(Step Change)
Data Freshness (Max)
DC Common Mode Rejec-
tion
AC Common Mode Rejec-
tion
Maximum Operating Com-
mon Mode Voltage
Isolation
Power Requirements
Operating Temperature
Storage Temperature
Wire size
Torque, hold-down screws
Torque, connector screws
Agency Approvals
Warranty
0 to 10 amp RMS AC/DC
To 11 amps
0.005 ohms
11 amps AC/DC
±8 mA and ±0.2% reading
400 microamps
±16 mA (0.16%)
63.2% (158 V) in 50 mS
99% (248 V) in 75 mS
32.3 ms
>-120 dB
>-120 dB at 60 Hz
250 V
1500 V
5 VDC (±0.15 V) at 170 mA
0 °C to 70 °C
-40 °C to 85 °C
22 to 14 AWG
4 in-lb (0.45 N-m)
5.26 in-lb (0.6 N-m)
UL, FM, CE, RoHS, DFARS
Lifetime
SNAP Analog Input Modules
Form 1065-140815
DATA SHEET
PAGE
4
The SNAP-AIARMS module may be used to monitor AC
current to greater than a 100-amp range, using a current
transformer of suitable ratio.
If you need a module with channel-to-channel isolation, see
form #1182, the
SNAP Isolated Analog Input Modules Data
Sheet.
Wiring diagrams
are on the following page.
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2001–2014 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.
SNAP Analog Input Modules
0 to 10 Amp RMS AC/DC Input Module (continued)
SNAP-AIARMS Wiring Diagrams
Two possible wiring diagrams are shown below.
Terminals 3, 4, 7, and 8 share a common connection inside the module.
Make sure you
observe polarity
when connecting the second channel. To avoid a potentially hazardous
short, double-check wiring before turning on the current to be monitored.
SNAP Analog Input Modules
DATA SHEET
Form 1065-140815
PAGE
5
Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com
SALES 800-321-6786 • 951-695-3000 • FAX 951-695-3095 • sales@opto22.com • SUPPORT 800-835-6786 • 951-695-3080 • FAX 951-695-3017 • support@opto22.com
© 2001–2014 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.
