Measurement-computing CIO-EXP-GP Manuel d'utilisateur télécharger pdf (Page 10)

affect measurements. If the potential exceeds the protection range of the input circuits, the board may be

damaged.

At this time, ignore the other screw terminals located next to the power and ground terminals. They are

needed only with certain sensors and will be explained in those sections.

3.6 Daisy-Chaining CIO-EXP-GP Boards

Connect one CIO-EXP-GP 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 Test Voltage

+P EXCITATION. VOLTS

−

SENSE

+ SENSE

(+)IEXC

CH0

−

VOLTS IN OR COMMON

+ VOLTS IN

SHORTING WIRE

INSTALLED

+EXCITATION CURRENT

+ SENSE

−

(

−

)

IEX

−

+ VOLTS IN

−

EXCITATION CURRENT

Make your initial test of the CIO-EXP-GP with a voltage

signal of between -5 and 5V. If you use an AC signal

source, keep the frequency below 70Hz to avoid

attenuation by the CIO-EXP-GP’s low pass filter.

Each input circuit has eight screw terminals associated

with it. These terminals are shown in the diagram to the

right.

To connect a voltage signal to the input circuit you use

three screw terminals as follows:

+SENSE Connect to + voltage

−

SENSE Jumper to

−

P Connect to Ground

There is not enough 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-GP as follows:

Figure 3-6. Input Screw Terminals

+P Excitation voltage

−

SENSE Low side of input

−

SENSE Hardwired to the other

−

SENSE, same function

−

IEXC Excitation current return

−

P Excitation voltage return, common with

−

IEXC

+SENSE High side of input

+SENSE Hardwired to other +SENSE, same function

+IEXC Excitation current

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 bridge and RTD sensors.

For voltage and thermocouple sensors the names on the terminals are not typical. Please refer to the

section on the measurement you are making in order to learn how to use the terminals.

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Measurement-computing CIO-EXP-GP Manuel d'utilisateur Page 10

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