User Manual
Table Of Contents
- Logix5000 Controllers I/O and Tag Data
- Summary of changes
- Table of contents
- Preface
- Communicate with I/O modules
- Organize tags
- Force I/O
- Data access control
- Introduction
- External access
- Configure external access
- External access availability
- User-defined type considerations
- Add-on instructions external access considerations
- Tag mapping considerations
- Imported tag behavior
- Constant value tags
- Configure constant tags
- Constant check box availability
- Add-on instructions constant value considerations
- Index
Chapter 1 Communicate with I/O modules
The drill routine executes the logic for the drill machine.
The map_outputs routine copies the values of output tags in the drill routine to their corresponding output devices.
The following example uses the CPS instruction to copy an array of data that
represent the input devices of a DeviceNet network.
Example: Buffer I/O using CPS instruction
Local:0:I.Data stores the input data for the DeviceNet network that is connected to the 1756-DNB module in slot 0. To synchronize the inputs with the application,
the CPS instruction copies the input data to input_buffer.
− While the CPS instruction copies the data, no I/O updates can change the data.
As the application executes, it uses the input data in input_buffer for its inputs.
20 Rockwell Automation Publication 1756-PM004E-EN-P - October 2014