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ConLAB RTM-8 Operation And Calibration Manual

Analog multiplexer
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RTM-8
ANALOG MULTIPLEXER
OPERATION AND CALIBRATION INSTRUCTIONS
1
C:\Documents and Settings\colab\My Documents\My Documents\T\RTM\RTMMAN-100.doc

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Summary of Contents for ConLAB RTM-8

  • Page 1 RTM-8 ANALOG MULTIPLEXER OPERATION AND CALIBRATION INSTRUCTIONS C:\Documents and Settings\colab\My Documents\My Documents\T\RTM\RTMMAN-100.doc...

  • Page 2: Table Of Contents

    CONTENTS: GENERAL DESCRIPTION MOUNTING INSTRUCTIONS REPLACING FUSES ASSEMBLY CURRENT INPUTS CONNECTING TRANSMITTERS TO THE MULTIPLEXER CONNECTING Pt-100 TO THE MULTIPLEXER CONNECTING THE MULTIPLEXER TO A PLC CONTROL 9.1 Enable 9.2 Address 9.3 Address Polarity 9.4 Control Tables CALIBRATION 10.1 Calibration Procedure 10.2 Calibration Tables 10.2.1 "ZERO"...

  • Page 3: General Description

    1. GENERAL DESCRIPTION The RTM-8 is a multiplexer for 16 analog inputs. The first eight channels, marked 1-8, are designated for Pt-100 sensors, while the remaining (9-16), are for 4-20mA current loop inputs. The RTM-8 output is a 4-20mA active current loop, with a 28mA limitation.

  • Page 4: Current Inputs

    5. CURRENT INPUTS The eight 4-20mA current inputs are marked as channels 9-16. These inputs are for current only. The "COM" input is the return for all the current channels. It is possible to connect any current source, as long as a closed loop is maintained.

  • Page 5: Connecting Pt-100 To The Multiplexer

    8. CONNECTING THE RTM-8 TO A PLC The multiplexer's output should be connected to 4-20mA input of the PLC analog module (see fig 5). The RTM-8 multiplexer generates the output current, therefore the PLC analog module should be configured as four wire transmitter connection.

  • Page 6: Control

    9. CONTROL The RTM-8 unit is controlled via four address lines and one E (Enable) line. The control terminals (Address and Enable), were designed to receive control signals levels up to 40V so that almost any PLC's DC output module can be used.

  • Page 7: Control Tables

    9.4 Control Tables 9.4.1 "True Low" Setting ADDRESS BUS OUTPUT ADDRESS BUS OUTPUT A3 A2 A1 A0 CHANNEL A3 A2 A1 A0 CHANNEL 0 0 0 0 1 0 0 0 0 0 0 1 1 0 0 1 0 0 1 0 1 0 1 0 0 0 1 1 1 0 1 1...

  • Page 8: Calibration Procedure

    10.1 Calibration procedure Remove the terminal strips to get access to the coarse setting switches. Set the channels DIP-switches to the desired calibration ranges according to the calibration tables. Re-install the terminal strips (the terminal strips are polarized and should be returned to their original position).

  • Page 9: Multidrop Configuration

    In the disabled state (E=0), the multiplexer outputs no current and exhibits a "High Z" state which means than to current is output or absorbed. This mode allows the connection of several RTM-8 units to one PLC's analog input, by tying their output terminals together, connecting the address lines in parallel, and controlling individual Enable lines to select the desired multiplexer by disabling all but one (see fig 7).
  • Page 10 12. SPECIFICATIONS ANALOG INPUTS: 8, Pt-100 Channels α=0.00385 8, 0/4-20mA Channels RTD INPUT: Zero adjustability: -100 to +200°C Span adjustability: 50 to 750°C Lead Compensation Error: ±0.025°C for 10Ω lead resistance Max Lead Resistance: 120Ω Pt-100 linearization: ±0.05 typ. ±0.1 max. of span CURRENT INPUT Max Input Current: 30 mA...

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