SNAP-TEX-MR10-4 OPTO 22, SNAP-TEX-MR10-4 Datasheet - Page 21

• Manufacturer Part Number: SNAP-TEX-MR10-4
• Description: 17T7109
• Manufacturer: OPTO 22
• Series: Snapr

Specifications of SNAP-TEX-MR10-4

• Accessory Type: Mechanical Relay Breakout Board
• Rohs Compliant: Yes
• For Use With: SNAP Digital Output Modules

SNAP TEX Cables and Breakout Boards
SNAP-AIMA-HDB and SNAP-AIV-HDB Breakout Boards
© 2008–2009 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.
The SNAP-AIMA-HDB, SNAP-AIMA-HDB-FM, SNAP-AIV-
HDB, and SNAP-AIV-HDB-FM breakout boards are primarily
designed for use with the SNAP-AIMA-32, SNAP-AIMA-32-FM,
SNAP-AIV-32, and SNAP-AIV-32-FM analog input modules,
respectively. Each of these modules provides 32 input points. The
breakout boards provide easy accessibility for wiring points to field
devices. Use the SNAP-HD-BF6 cable for wiring connections
between the module and the breakout board.
Note for the SNAP-AIMA-32 or SNAP-AIMA-32-FM: if you are using
one of these modules with loop power (2-wire) devices, connect
to the SNAP-AIMA-HDB or SNAP-AIMA-HDB-FM rack as shown
below. If you are using the SNAP-AIMA-32 (or -FM) with self-
powered devices (4-wire), do not use the SNAP-AIMA-HDB (or
-FM) boards, which have a current limiter. Instead, wire to the
SNAP-AIV-HDB or SNAP-AIV-HDB-FM as shown on
CAUTION: We strongly recommend that you use the breakout
board with the SNAP-AIMA-32 (or -FM) module. Without the
board , miswiring of any point on the module can cause severe
out-of-warranty damage. The breakout board protects the module
from many wiring errors.
Working with Module Values
AIMA modules used with a SNAP-AIV-HDB board read normally.
However, values on AIMA modules used with a SNAP-AIMA-HDB
board are read as negative values. For example, a value of 10 mA
on the module will be read as -10 mA. (Note: If no readings
appear, try reversing field connections on the board.)
Because these readings are negative values, they can be confusing
to work with. This section shows you how to easily change them
to positive values or scale them to the positive readings you need.
This section applies only with the SNAP-AIMA-HDB board.
SNAP-AIMA-HDB breakout board
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Changing Negative to Positive Values
(SNAP-AIMA-HDB board only) To read positive values, when you
configure points on the module, choose the scalable option and
enter the corresponding positive values, like this:
This may seem odd, but it works. Don’t be confused by the
“Lower” and “Upper” labels for the values. Positive values sent to
the module will be shown as the correct positive values within
your PAC Control strategy.
Scaling Values
Similarly, if you need to scale values for your application, enter the
positive values you need. The module’s range is 4 to 20 mA. If you
want 4 to represent 0 mA and 20 to represent 130 mA, for
example, enter those values as shown below:
The scaled values will appear correctly in your strategy.
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