Table of Contents
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Introduction
The information in this section is formatted as follows:
•
Power limits — Summarizes the maximum power lim-
its of the Model 7021 multiplexer-digital I/O card.
Mainframe control of the card — Summarizes pro-
•
gramming steps to control the card from the Model
7001/7002 switch system mainframe.
Multiplexer switching examples — Provides some
•
typical applications for using the Model 7021.
•
Measurement considerations — Reviews a number of
considerations when using the Model 7021 to make
measurements.
Power limits
CAUTION
To prevent damage to the card, do not
exceed the maximum signal level speci-
fications of the card.
Analog multiplexer maximum signal levels
To prevent overheating or damage to the relays, never exceed
the following maximum signal levels: 110V DC or rms,
155V peak between any two inputs or chassis, 1A switched,
30VA (resistive load).
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Operation
Digital I/O maximum signal levels
To ensure proper operation and prevent damage to the card,
never exceed the following power limits:
Output channels
Maximum user-supplied pull-up voltage: 42V
Maximum sink current:
Per channel: 250mA
Per card: 1A
Input channels
Maximum voltage level: 42V peak
Mainframe control of the card
The following information pertains to the Model 7021. It
assumes that you are familiar with the operation of the
Model 7001/7002 mainframe—whichever is used.
If you are not familiar with the operation of the mainframe in
use, proceed to Getting Started (Section 3) of the Model
7001 or Model 7002 Instruction Manual after reading the
following information.
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Table of Contents
Troubleshooting
