Measurement Computing CIO-EXP-RTD16 User manual

CIO-EXP-RTD16
RTD EXPANSION BOARD
User’s Manual
Revision 2
©Copyright, November, 2000

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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,
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HM CIO-EXP-RTD16.lwp

Table of Contents
15
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

19
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 ..................................................
iv

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.
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.
1
2
3
4
5
6
7
8
9
10
11
12
14
15
0
13
36
35
34
33
32
31
30
18
17
16
15
14
12
11
37 D
CONNECTOR
37
13
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
2

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

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
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
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
NC / LLGND
L
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
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
4

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
N
O
4 3 2 1
CUSTOM IEXC
+5 REM
X1
IEXC=1MA
+5 COMP
X7
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.
5

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.
6