Rockwell Automation 1771-OFE/B Analog Output Module User Manual User Manual

Page 6

Preface

P–2

Publication 1771Ć6.5.30 - November 1998

Appendices

Title

Specifications

Block Transfer with MiniĆPLCĆ2 and PLCĆ2/20 Processors

Data Table Formats

You can install your output module in any system that uses
Allen-Bradley programmable controllers that have block transfer
capabilities and the 1771 I/O structure.

For more information on your programmable controllers, contact
your nearest Allen-Bradley office.

The 1771-OFE module can be used with any 1771 I/O chassis.
Communication between the discrete analog module and the
processor is bidirectional; the processor block-transfers output data
through the output image table to the module and block-transfers
input data from the module through the input image table. The
module also requires an area in the data table to store the read block
transfer data and write block transfer data. I/O image table use is an
important factor in module placement and addressing selection.
Compatibility and data table use is listed in the following table.

Table P.A

Compatibility and Use of Data Table

Use of Data Table

Compatibility

Catalog

Number

Input

Image

Output

Image

Read

Block

Write

Block

Addressing

Chassis

Image

Bits

Image

Bits

Block

Words

Block

Words 1/2ĆSlot

1ĆSlot

2ĆSlot

Series

1771ĆOFE

A, B

A = Compatible with 1771ĆA1, ĆA2, ĆA4

B = Compatible with 1771ĆA1B, ĆA2B, ĆA3B, ĆA3B1, ĆA4B

Y = Compatible without restriction.

•

You can place your module in any I/O module slot of the I/O
chassis.

•

You can put two output modules in the same module group.

•

Do not put the module in the same module group as a discrete
high density module.

•

Avoid placing output modules close to ac modules or high voltage
dc modules.

For a list of publications with information on Allen-Bradley
programmable controller products, consult our publication index
(SD499).