Rockwell Automation 1771-OFE/B Analog Output Module User Manual - Manual (Page 11)

Chapter
1
Publication1771Ć6.5.30 - November 1998
Overview of the Analog Output
Module
Read this chapter to familiarize yourself with the analog output
module.
For information on See page
About the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Module Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Output Ranges . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
How Analog Modules Communicate with Programmable
Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1-3
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.
What This Chapter
Contains
About the Analog Output
Module