ALLEN BRADLEY 1771-OFE3

In the programmable controller system, the analog output module

provides the following functions:

• four individually isolated differential outputs

• selectable scaling to engineering units

• selectable data format

• selectable voltage ranges (1771-OFE1 only)

• no external power required--power is drawn from the 1771 I/O

chassis backplane.

• requires only one I/O slot

The Analog Output Module (cat. no. 1771-OFE) is an intelligent

block transfer module that converts binary or four-digit BCD values

(supplied by your processor) to analog signals at its four module

outputs. The module accomplishes the data transfer with block

transfer programming.

Block transfer write (BTW) programming moves up to 13 words of

data from the processor to the module for digital to analog (D/A)

conversion in one program scan. This information is converted to

analog signals and is sent to the appropriate output channels.

A block transfer read (BTR) moves five words of data from the

module to the processor data table, if desired, for diagnostic

purposes. The BTR is discussed in Chapter 7, “Diagnostics and

Troubleshooting.”

The module has a scaling feature that converts data sent to the

module in engineering units to the proper analog signals.

You may connect up to four analog output devices--such as valve

positioners, motor speed controllers, signal converters or

recorders--to the analog output module’s four channels. All analog

output device inputs should conform to the voltage or current ratings

of each module output channel.

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