Measurement Computing CIO-EXP-RTD16 Manuale utente

CIO-EXP-RTD16

RTD EXPANSION BOARD

User’s Manual

Revision 2

©Copyright, November, 2000

LIFETIME WARRANTY

Every hardware product manufactured by Measurement Computing Corp. is warranted against defects in materials or

workmanship for the life of the product, to the original purchaser. Any products found to be defective will be repaired or

replaced promptly.

LIFETIME HARSH ENVIRONMENT WARRANTYTM

Any Measurement Computing Corp. product which is damaged due to misuse may be replaced for only 50% of the current price.

I/O boards face some harsh environments, some harsher than the boards are designed to withstand. When that happens, just

return the board with an order for its replacement at only 50% of the list price. Measurement Computing Corp. does not need to

profit from your misfortune. By the way, we will honor this warranty for any other manufacture’s board that we have a

replacement for!

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its employees shall be liable for any direct or indirect, special, incidental or consequential damage arising from the use of its products, even if

Measurerment Computing Corp. has been notified in advance of the possibility of such damages.

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,InstaCal, Harsh Environment

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Measurement Computing Corp.

means, electronic, mechanical, by photocopying, recording or otherwise without the prior written permission of Measurement

Computing Corp.

Notice

Measurement Computing Corp. does not authorize any Measurement Computing Corp. product for

use in life support systems and/or devices without the written approval of the President of

Measurement Computing Corp. Life support devices/systems are devices or systems which, a) are

intended for surgical implantation into the body, or b) support or sustain life and whose failure to

perform can be reasonably expected to result in injury. Measurement Computing Corp. products

are not designed with the components required, and are not subject to the testing required to

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HM CIO-EXP-RTD16.lwp

Table of Contents

5.6 CONNECTING THE RTD TO THE SCREW TERMINALS ...................... 15

5.5 CHANNEL CONFIGURATION SWITCH ...................................... 14

5.4.2 Second Stage Gain ...................................................... 14

5.4.1 First Stage Gain ........................................................ 13

5.4 SETTING THE GAIN ........................................................ 12

5.3 DETERMINING THE APPROPRIATE GAIN ................................... 12

5.2 POWER SOURCE SWITCH .................................................. 12

5.1 CHANNEL SELECTION ..................................................... 12

5 RTD MEASUREMENT CONFIGURATION ..................................... 11

4.7.3 Fully Differential ....................................................... 10

4.7.2 Floating Differential ..................................................... 9

4.7.1 Single Ended ............................................................ 9

4.7 CONNECTING VOLTAGE SIGNALS .......................................... 9

4.6 CHANNEL CONFIGURATION SWITCH ....................................... 9

4.5 ATTENUATION ............................................................. 8

4.4.2 Second Stage Gain Switch ................................................ 8

4.4.1 First Stage Gain Switch ................................................... 8

4.4 SETTING THE GAIN ......................................................... 7

4.3 DETERMINING THE APPROPRIATE GAIN .................................... 7

4.2 POWER SOURCE SWITCH ................................................... 7

4.1 CHANNEL SELECTION ...................................................... 7

4 VOLTAGE MEASUREMENT CONFIGURATION ................................ 6

3.8 VERIFYING THE INSTALLATION ............................................ 6

3.7 CONNECTING A VOLTAGE SIGNAL ......................................... 6

3.6 DAISY-CHAINING CIO-EXP-RTD16 BOARDS ................................. 5

3.5.3 Powering with the C-PCPOWER-10 cable: .................................. 5

3.5.2 Powering with the 37 pin connector: ........................................ 5

3.5.1 Power Source Switch ..................................................... 5

3.5 POWERING THE CIO-EXP-RTD16 ............................................ 4

3.4.3 Other A/D Boards ........................................................ 4

3.4.2 Connecting to a DAS16 Series A/D Board ................................... 4

3.4.1 Connecting to a DAS08 Series A/D Board ................................... 4

3.4 CONNECTING THE CIO-EXP-RTD16 TO THE A/D BOARD ..................... 3

3.3.3 All A/D Boards .......................................................... 3

3.3.2 DAS16 Family Setup ..................................................... 3

3.3.1 DAS08 Family Setup ..................................................... 3

3.3 CONFIGURING THE A/D BOARD ............................................ 2

3.2 SETTING THE OUTPUT CHANNEL ........................................... 2

3.1 A/D BOARD-TYPE SELECT JUMPER ......................................... 2

3 GENERAL CONFIGURATION .................................................. 1

2 SOFTWARE INSTALLATION .................................................. 1

1 INTRODUCTION ..............................................................

iii

7 SPECIFICATIONS ............................................................ 18

6.2 CUSTOM SECOND STAGE GAIN RESISTOR - RX100 ......................... 17

6.1 CUSTOM EXCITATION CURRENT - R89 ..................................... 17

6 CUSTOM GAIN AND EXCITATION CALCULATIONS ......................... 17

5.7 CALIBRATION AND TEST .................................................. 17

5.6.3 Four-Wire RTD Hookup ................................................. 16

5.6.2 Three-Wire RTD Hookup ................................................ 16

5.6.1 Two-wire RTD Hookup ..................................................

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.

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.

DAS08 DAS16

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

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.

37 D

CONNECTOR

OUTPUT CHANNEL SELECT

8 CHANNEL MULTIPLEXOR

AMP

GAIN

1 OR 7

INPUT 0

INPUT 1

INPUT 2

INPUT N

INPUT N + 1

INPUT 13

INPUT 14

INPUT 15

MUX CONTROL

AMP

GAIN

1,2, 4, 8

7-10

16-CHANNEL MULTIPLEXER

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.

Figure 3-2. Channel-Selection Block Diagram

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.

1234567 8 9 10 11 12 14 15

013

CH SEL

CHANNEL 0 SELECTED

FOR BOARD OUTPUT

Figure 3-3 is a diagram of the jumper

positions.

Place the jumper on the pin which

corresponds to the A/D board's input

channel.

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.

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

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

OUTPUT 0

OUTPUT 1

OUTPUT 2

OUTPUT 3

OUTPUT 4

OUTPUT 5

OUTPUT 6

OUTPUT 7

+5 VOLTS FROM PC

POWER GROUND

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

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.

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

3.5 POWERING THE CIO-EXP-RTD16

The CIO-EXP-RTD16 can be powered through the 37-pin cable or the Molex connector. The power that

can be carried through the 37-pin connector is limited so we recommend this only when a single

CIO-EXP-RTD16 is used.

The power required to run a CIO-EXP-RTD16 channel is dependent on the sensor connected to it.

Voltage measurements do not draw additional power from the CIO-EXP-RTD16, but RTDs do for the

excitation current.

3.5.1 Power Source Switch

4 3 2 1

CUSTOM IEXC

+5 REM

IEXC=1MA

+5 COMP

GND

One of the switches on the four-position DIP

switch labeled “2” controls the source of the +5V

power to the CIO-EXP-RTD16.

When positioned down, (+5 COMP), the +5V

power is drawn from the personal computer

through the signal cable. In the +5REM position

(up) power is drawn through the MOLEX

connector.

The right-hand switch selects the source of the

excitation current. The choices are 1 mA source

or a custom current selected by installing a

resistor at R89.

Figure 3-5. Power Source Switch

3.5.2 Powering with the 37 pin connector:

You may power the CIO-EXP-RTD16 via the 37-pin cable. Only one CIO-EXP-RTD16 can be powered

via the 37-pin cable. If you are powering multiple boards, use the C-PCPOWER-10 cable.

3.5.3 Powering with the C-PCPOWER-10 cable:

The CIO-EXP-RTD16 may be powered from the PC's power supply by connecting it to that power supply

through a C-PCPOWER-10 cable. This cable has the same Molex connector that is used inside the PC

and so may be connected directly to the PC's power supply through one of the spare connectors. The

cable is keyed, so it should not be forced. When inserted properly it will slide easily and snap in place.

3.6 DAISY-CHAINING CIO-EXP-RTD16 BOARDS

Connect one CIO-EXP-RTD16 to another using a C37FF-# ribbon cable. Connect from P2 on the

‘upstream’ board to P1 on the ‘downstream’ board. Make sure each of the boards in the chain have a

unique channel selected (CH SEL jumper is set to a different number on each board).

3.7 CONNECTING A VOLTAGE SIGNAL

Make your initial test of the CIO-EXP-RTD16 with a simple voltage signal of between 0 and 5V. If you

have a variable signal source, all the better.

+IEXC

+SENSE

−IEXC

−SENSE

CH0

Voltage

Source

Add Jumper

Single-Ended Voltage Input

Signal-High

Signal-Low

(Gnd.)

Each input circuit has four screw terminals

associated with it. These terminals are shown in

Figure 3-6 to the right.

To connect a voltage signal to the input circuit you

need only use three screw terminals, these are:

+SENSE Connect the + voltage to this

-SENSE Place a wire between this and -IEXC

-IEXC Connect the Ground to this

Figure 3-6. Connection Terminal Block for

Voltage Test (Channel 0 Shown)

There is not room on the board for the full name next to each terminal so the eight screw terminals

associated with each input circuit are labeled on the CIO-EXP-RTD16 as follows:

+IEXC High side of RTD excitation current

+SENSE High side of input signal from voltage or RTD current

-IEXC Low side of excitation current or chassis ground for volts

-SENSE Low side of input signal from voltage or RTD

The use of the terminals is dependent on the type of sensor you have connected to the input circuit, and

the nomenclature on the terminals has been chosen to make the most sense for RTD sensors.

3.8 VERIFYING THE INSTALLATION

To verify the installation, test or calibrate the CIO-EXP-RTD16, use the InstaCal program installed on

your computer. This software came with your A/D board if you bought the board from the same

manufacturer as the CIO-EXP-RTD16. If your A/D board is not from the same manufacturer but is

compatible, please call technical support and request a copy of InstaCal.

Use InstaCal's TEST option to verify that a signal present at one of the CIO-EXP-RTD's inputs can be

read. You will not need to set any jumpers other than those previously mentioned, and should not set any

switches or install any passive components until you have verified the installation.

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