Measurement CIO-EXP-RTD16 User Manual

CIO-EXP-RTD16

RTD EXPANSION BOARD

User’s Manual

Revision 2

© Copyright, November, 2000

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.

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MEGA-FIFO, the CIO prefix to data acquisition board model numbers, the PCM prefix to data acquisition board model numbers,
PCM-DAS08, PCM-D24C3, PCM-DAC02, PCM-COM422, PCM-COM485, PCM-DMM, PCM-DAS16D/12,
PCM-DAS16S/12, PCM-DAS16D/16, PCM-DAS16S/16, PCI-DAS6402/16, Universal Library,

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HM CIO-EXP-RTD16.lwp

Table of Contents

1 INTRODUCTION
2 SOFTWARE INSTALLATION
3 GENERAL CONFIGURATION

3.1 A/D BOARD-TYPE SELECT JUMPER

3.2 SETTING THE OUTPUT CHANNEL

3.3 CONFIGURING THE A/D BOARD

3.3.1 DAS08 Family Setup

3.3.2 DAS16 Family Setup

3.3.3 All A/D Boards

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3.4 CONNECTING THE CIO-EXP-RTD16 TO THE A/D BOARD

3.4.1 Connecting to a DAS08 Series A/D Board

3.4.2 Connecting to a DAS16 Series A/D Board

3.4.3 Other A/D Boards

3.5 POWERING THE CIO-EXP-RTD16

3.5.1 Power Source Switch

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3.5.2 Powering with the 37 pin connector:

3.5.3 Powering with the C-PCPOWER-10 cable:

3.6 DAISY-CHAINING CIO-EXP-RTD16 BOARDS

3.7 CONNECTING A VOLTAGE SIGNAL

3.8 VERIFYING THE INSTALLATION

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4 VOLTAGE MEASUREMENT CONFIGURATION

4.1 CHANNEL SELECTION

4.2 POWER SOURCE SWITCH

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4.3 DETERMINING THE APPROPRIATE GAIN

4.4 SETTING THE GAIN

4.4.1 First Stage Gain Switch

4.4.2 Second Stage Gain Switch

4.5 ATTENUATION

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4.6 CHANNEL CONFIGURATION SWITCH

4.7 CONNECTING VOLTAGE SIGNALS

4.7.1 Single Ended

4.7.2 Floating Differential

4.7.3 Fully Differential

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5 RTD MEASUREMENT CONFIGURATION

5.1 CHANNEL SELECTION

5.2 POWER SOURCE SWITCH

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5.3 DETERMINING THE APPROPRIATE GAIN

5.4 SETTING THE GAIN

5.4.1 First Stage Gain

5.4.2 Second Stage Gain

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5.5 CHANNEL CONFIGURATION SWITCH

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5.6 CONNECTING THE RTD TO THE SCREW TERMINALS

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5.6.1 Two-wire RTD Hookup

5.6.2 Three-Wire RTD Hookup

5.6.3 Four-Wire RTD Hookup

5.7 CALIBRATION AND TEST

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6 CUSTOM GAIN AND EXCITATION CALCULATIONS

6.1 CUSTOM EXCITATION CURRENT - R89

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6.2 CUSTOM SECOND STAGE GAIN RESISTOR - RX100

7 SPECIFICATIONS

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1 INTRODUCTION

The CIO-EXP-RTD16 is a signal conditioning accessory designed for use with the DAS08 and DAS16
family of data acquisition boards. Circuitry to excite selected RTDs on a per channel basis converts the
RTD's output current to a voltage suitable for conversion by a DAS08 or other analog to digital
conversion board.

This manual is loosely organized into sections that explain the CIO-EXP-RTD16:

Installation: Installation and initial setup.
Voltage Reading: Explains how to set up for and make voltage only readings.
RTD: Describes how two, three, and four-wire type RTDs are connected.

Please carefully read the Installation section and follow the initial installation and test steps. Verify the
installation with a voltage measurement prior to connecting RTDs and attempting to measure
temperature.

2 SOFTWARE INSTALLATION

There is no software shipped with the CIO-EXP-RTD16. The CIO-EXP-RTD16 is an accessory board
intended to be used with an A/D board such as a CIO-DAS08 or -DAS16. A program called InstaCal is
shipped with every DAS board. InstaCal has installation information in it about the CIO-EXP-RTD16.
Refer to the Software Installation Manual for complete information.

To update the InstaCal configuration file to include CIO-EXP-RTD16 information, start InstaCal, select
the board number of the DAS board that has the CIO-EXP-RTD16 connected to it, and select the channel
number the CIO-EXP-RTD16 is connected to. The options for the CIO-EXP-RTD16 will be available to
set and change. After this is done, you can use the InstaCal calibrate and test options.

You must use InstaCal to update and configure the configuration file CB.CFG to include the
CIO-EXP-RTD16 settings before you can use the CIO-EXP-RTD16 with InstaCal, Universal Library and
some applications packages. Initially, accept the default settings so that you can verify the installation.
You may have to go back and make changes with InstaCal once you have selected a sensor and read the
section on installing that sensor.

1

3 GENERAL CONFIGURATION

3.1 A/D BOARD-TYPE SELECT JUMPER

The CIO-EXP-RTD16 may be used with either DAS08 or DAS16 family boards because the signal
assignments of the 37 pin connector match those of the DAS08, and may be adapted to those of the
DAS16 with a C-EXP2DAS16-10 cable. Jumper JB10 on the CIO-EXP-RTD16 board located near the
37-pin connectors is used to select the either the DAS08 or DAS16 A/D board family.

Select the A/D board type (DAS08 or DAS16) using the JB 10 jumper
(Figure 3-1).

The jumper is shown here with the CIO-EXP-RTD16 configured for

DAS08

DAS16

use with a CIO-DAS08 family board.

Figure 3-1. DAS08/16 Select Jumper

3.2 SETTING THE OUTPUT CHANNEL

Jumper positions labeled “CH SEL” located near the 37-pin connectors are used to select one
CIO-EXP-RTD16 output channel to which the output from the addressed RTD will be connected. This
setting determines which A/D channel is used to acquire data from the CIO-EXP-RTD16 when it is
connected to an A/D board.

There are 16 jumpers for the
output. Each jumper corresponds
to one of the 16 output pins on
the 37-pin connector.

When the CIO-EXP-RTD16 is
connected to a DAS08 series
board, any one of the first 8
channels (labeled 0-7) may be
used.

When the CIO-EXP-RTD16 is
connected to a DAS16 series
board, any one of 16 jumper
positions may be used.

In each case, the jumper
corresponds to an input channel
number on the A/D board. See
Figure 3-2 and 3-3.

37 D

CONNECTOR

37
36
35
34
33
32
31
30
18
17
16
15
14
13
12
11

7-10

OUTPUT CHANNEL SELECT

0
1
2
3
4
5
6
7
8

9
10
11
12
13
14
15

AMP

AMP

GAIN

GAIN

1 OR 7

1,2, 4, 8

MUX CONTROL

INPUT 0

INPUT 1

INPUT 2

INPUT N

INPUT N + 1

8 CHANNEL MULTIPLEXOR

16-CHANNEL MULTIPLEXER

INPUT 13

INPUT 14

INPUT 15

Figure 3-2. Channel-Selection Block Diagram

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NOTE: If the jumper setting does not agree with the selection made in InstaCal setup, InstaCal and the
Universal Library will not be able to make readings from the CIO-EXP-RTD16.

One individual channel must be selected for each bank of 16 EXP channels. For example, if you are
using several CIO-EXP-RTD16 boards, the jumper setting for each board must be unique. If you select
channel 0 for the first board, do not use this channel for any of the other boards.

Figure 3-3 is a diagram of the jumper
positions.

1234567

0

8 9 10 11 12 1415

13

Place the jumper on the pin which
corresponds to the A/D board's input
channel.

CH SEL

CHANNEL 0 SELECTED
FOR BOARD OUTPUT

Figure 3-3. Channel Selection Jumper Locations

3.3 CONFIGURING THE A/D BOARD

3.3.1 DAS08 Family Setup

The input mode of the A/D board must be single-ended to be compatible with the CIO-EXP outputs.
Some of the boards in the DAS08 series have differential inputs that can be converted to single-ended
inputs. See the information shipped with your A/D board for conversion to single-ended inputs.

3.3.2 DAS16 Family Setup

The input mode of the A/D board must be single-ended to be compatible with the CIO-EXP outputs.
Most of the DAS16 series is switch selectable for either 8 differential or 16 single ended inputs. When
used with the CIO-EXP, set the switch to 16 channel, single-ended mode.

3.3.3 All A/D Boards

If the range of your A/D board is switch selectable and you are using RTDs, set the range of the A/D
board to 5V Unipolar, if available, or 10V Unipolar if not. Some software packages base the calculation
of temperature on these ranges only. (The optional Universal Library does allow other ranges, but 5V
Unipolar is preferred.)

If your A/D board has a UNI / BIP switch (for setting the range to either unipolar or bipolar), the
preferred setting is UNI (unipolar).

If the range on your A/D board is fully programmable, the software you use for temperature measurement
will determine the correct range to use

If you are not using RTDs, set the range of the A/D board to accommodate the maximum output expected
from the CIO-EXP-RTD16 board.

3

3.4 CONNECTING THE CIO-EXP-RTD16 TO THE A/D BOARD

L

3.4.1 Connecting to a DAS08 Series A/D Board

A CIO-DAS08 series board may be connected directly through a C37FF series cable from the P1
connector on the CIO-EXP-RTD16 to the A/D analog connector. The JB10 jumper should be left in the
DAS08 position as set at the factory.

3.4.2 Connecting to a DAS16 Series A/D Board

The CIO-EXP can be used with DAS16 series boards, expanding the DAS16's 16 inputs to 256 inputs.
The connection requires a special 37-conductor cable (CEXP2DAS16-10) since pin relationship of
CIO-EXP and DAS16 signals is not 1:1.

Install the CEXP2DAS16-10 cable connector labeled “MUX” into the P1 connector of the
CIO-EXP-RTD16 board and the other end into the DAS16 series board’s analog connector.

3.4.3 Other A/D Boards

If you need to connect to a board other than
those described above, call technical support.
We may have the cable you need.

Alternatively, you could use this connector
diagram to construct a cable.

The signal from the CIO-EXP-RTD16 is a
multiplexed voltage from each RTD input to a
single jumper-selected channel and an analog
ground (LLGND). There should be no voltage
between analog ground and power ground.

The MUX address lines control the setting of
the channel multiplexer. When all are low, the
mux is set to channel 0. The lines are binary
coded with MUXADDR1 being the LSB and
MUXADDR4 being the MSB.

The output digital address lines from an A/D
card are typically named Dig. Out 0 to Dig.
Out 3 respectively.

NC / LLGND

LGND / OUTPUT 8

OUTPUT 9

OUTPUT 10
OUTPUT 11
OUTPUT 12
OUTPUT 13
OUTPUT 14

OUTPUT 15
MUX ADDR 4
MUX ADDR 3
MUX ADDR 2
MUX ADDR 1

NC

NC
NC
NC
NC
NC

19
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16
15
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10
9
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3
2
1

37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20

OUTPUT 0
OUTPUT 1
OUTPUT 2
OUTPUT 3
OUTPUT 4
OUTPUT 5
OUTPUT 6
OUTPUT 7
+5 VOLTS FROM PC
POWER GROUND
NC
NC
NC
NC
NC
NC
NC
NC

Figure 3-4. 37-Pin Connector Pin-out

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