Rockwell Automation 1769-OF4 Compact Analog Output Module - Manual (Page 30)

30 Publication 1769-UM020A-EN-P - December 2009
Chapter 3 Module Data, Status, and Channel Configuration
Input Image
The input image file represents data words and status bits.
Word 0 holds the general status bits for each output channel as well as
the over-range and under-range output-clamp status bits. To receive
valid status information, the output channel must be enabled. Words
1…4 contain the data echo values for the most recent data sent to the
output channels.
Output Image
Output words 0…3 contain the digital data to be converted by outputs
0…3 into analog output signals. Word 4 contains the cancel clamp
alarm latched status control bits for the high and low output-clamp
statuses on each output channel. These bits are used to cancel
output-clamp statuses when the clamp statuses are latched.
Configuration File
The configuration file contains information that you use to define the
way a specific channel functions.
The manipulation of bits from this file is normally done with
programming software (for example, RSLogix 5000, RSLogix 500, or
RSNetWorx for DeviceNet software) during initial configuration of the
system. In that case, graphical screens provided by the programming
software simplify configuration.
Some systems, like the 1769-ADN DeviceNet adapter system, also
allow the bits to be altered as part of the control program by using
communication rungs. In that case, it is necessary to understand the
bit arrangement
.
TIP
Not all controllers support program access to the configuration
file. Refer to your controller’s user manual.