SNAP Analog Input Modules

Opto 22 • 43044 Business Park Drive • Temecula, CA 92590-3614 • www.opto22.com

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8

Current Input Module, -20 mA to +20 mA, Eight Channels

Specifications

SNAP-AIMA-8

4-20 self-powered (self-

sourcing) transmitters

Current Source

NOTE: Terminals 2, 4, 6, and 8 on both

connectors are connected internally.

NOTE: For transmitters sharing the plus side of the loop power

supply, the input current will be read as a positive current.

CH 2

CH 1

CH 0

CH 3

T

1

23

4

5

6

7

8

T

T

T

T

2 3

4 5 6

7 8 1

2 3

4 5 6

7 8

CH 4

CH 5

CH 6

CH 7

T

T

T

External loop

power supply

OR

See additional wiring diagrams on page 7.

Description

The SNAP-AIMA-8 module provides an input range of -20mA

to +20mA with eight channels of analog current input. (If you

need a similar module with 32 channels, see page 9.) The

SNAP-AIMA-8 can be used with SNAP PAC brains and rack-

mounted controllers only. These modules DO NOT supply

loop excitation current.

Since all inputs share a common reference, the module must

be installed at the beginning or end of a typical 4–20mA loop.

If you are using both standard and self-sourcing transmitters,

either put the transmitters on different modules or use

different power supplies. If you need channels that are

isolated from each other on the same module, see Opto 22

form #1182.

If you have multiple self-sourcing transmitters that share the

same positive common, do not use this module. Use the

SNAP-AIMA-i module instead. See Opto 22 form #1182.

Part Number

Description

SNAP-AIMA-8

Eight-channel analog current input,

-20 mA to +20 mA

Input Range

-20 mA to +20 mA

Over-Range Limits

From -22 to +22 mA

(+/-20 mA range)

Resolution

0.8 microamps

Data Freshness (Max)

0.28 seconds

DC Common Mode Rejection

>-120 dB

AC Common Mode Rejection

>-120 dB @ 60 Hz

Maximum Survivable Input

36 mA or 9 VDC

Maximum Operating Common

Mode Voltage

250 V

Accuracy

0.05% (10 microamps)

DRIFT: Gain Temperature

Coefficient

30 PPM/ °C

DRIFT: Offset Temperature

Coefficient

15 PPM/ °C

Isolation

1500 V

Power Requirements

5 VDC (±0.15 ) @ 170 mA

Input Resistance - Single

Ended

100 ohms (all channels share

the same reference point)

Operating Temperature

0 °C to 70 °C

Storage Temperature

-40 °C to 85 °C

Torque, hold-down screws

4 in-lb (0.45 N-m)

Torque, connector screws

1.7 in-lb (0.19 N-m)

Agency Approvals

CE, RoHS, DFARS

Warranty

Lifetime