Omega DRA-RTM-8 User Manual

User’s Guide

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DRA-RTM-8

ANALOG MULTIPLEXER

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It is the policy of OMEGA to comply with all worldwide safety and EMC/EMI regulations that apply.
OMEGA is constantly pursuing certification of its products to the European New Approach Directives.
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The information contained in this document is believed to be correct but OMEGA Engineering, Inc.
accepts no liability for any errors it contains, and reserves the right to alter specifications without notice.
WARNING: These products are not designed for use in, and should not be used for, patient connected
applications.

Contents

1. GENERAL DESCRIPTION

2. MOUNTING INSTRUCTIONS

3. REPLACING FUSES

4. ASSEMBLY

5. CURRENT INPUTS

6. CONNECTING TRANSMITTERS TO THE MULTIPLEXER

7. CONNECTING Pt-100 TO THE MULTIPLEXER

8. CONNECTING THE MULTIPLEXER TO A PLC

9. CONTROL

9.1 Enable

9.2 Address

9.3 Address Polarity

9.4 Control Tables

10. CALIBRATION

10.1 Calibration Procedure

10.2 Calibration Tables

10.2.1 "ZERO" - Coarse Calibration Tables

10.2.2 "SPAN" - Coarse Calibration Tables

11. MULTIDROP CONFIGURATION

12. SPECIFICATIONS

1

1. GENERAL DESCRIPTION

The DRA-RTM-8 is a multiplexer for 16 analog inputs - eight of which, marked
1-8, are direct inputs for Pt-100 sensors, while the remaining (9-16), are for 4­20mA current loops.
The DRA-RTM-8 output format is a 4-20mA current loop, with a 28mA limitation.

Each Pt-100 input has its own signal conditioner, allowing each input to be
calibrated separately. Each signal conditioner includes six DIP switches for coarse
calibration and two potentiometers for fine tuning.

2. MOUNTING INSTRUCTIONS

The DRA-RTM-8 is designed for standard DIN rail mounting.
Place the unit on the upper part of the mounting rail with the fastening tab facing

down. Using a suitable flat screwdriver loosen the tab slightly and attach the unit
to the rail. Once the tab is loosened, ensure that the unit is fastened securely in
place.

3. REPLACING FUSES

To replace a blown fuse, disassemble the unit as follows:
a. Take off both terminal strips by removing the four screws at the edges.

Note: This does not require disconnecting the cables connected to the strips.

b. Remove the front panel using a suitable flat screwdriver. Press down gently on
the plastic springloaded tabs located in the slots on either side of the unit.
c. Disconnect the flat connectors which connects the front panel printed circuit.
d. Replace the blown fuse.

WARNING: Never install a fuse rated more than 800mA

4. ASSEMBLY

The DRA-RTM-8 unit includes two printed circuit cards designated as P.N 7020
and P.N 7021. The two printed circuit cards should occupy the slots in the
enclosure according to fig 1.

2