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70 CAS User’s Guide

Troubleshooting

Digital Output Test

Test digital outputs this way:

1. Connect a 500 ohm to 100 Kohm resistor between the +5V pin

(TB-50 screw terminal 1) and the output pin you want to test.

2. Connect the Common lead to the output pin.

3. Connect the voltmeter positive lead to the +5V pin.

4. If you are testing a digital output, use the Manual I/O Test menu to

turn the output on and off. (See Chapter 4: Setup for information on

the Manual I/O Test menu.)

Digital Input Test

Test digital inputs this way:

1. Go to the digital input test menu (under the Manual I/O Test main

menu). This menu shows whether the digital inputs are H (high, or

open) or L (Low, or closed).

2. Attach a wire to the terminal of the digital input you want to test.

•

When the wire is connected only to the digital input terminal,

the digital input test menu should show that the input is H

(High, or open).

•

When you connect the wire to logic ground (TB-50 pin 3), the

digital input test menu should show that the input is L (Low,

or closed).

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Watlow CAS Manual do Utilizador Página 80