Presentation of the implementation of the AS-Interface Bus

Introduction

The AS-Interface bus allows the interconnection on a single cable of sensor devices/actuators at the lowest level of automation. These sensors/actuators are defined in this documentation as slave devices.

To implement the AS-Interface application you need to define the physical context of the project (rack, power supply, processor, modules, and AS-Interface slave devices connected to the bus) then ensure its software implementation.

The software implementation of the application modules is performed from the various Control Expert editors in:

Local mode
Connected mode

AS-Interface Bus Implementation Principle

The following procedure is the recommended order of the implementation, but it is possible to modify the order of some phases (for example, to start with the configuration phase):

Phase	Description	Mode
Variable Declarations	Declaration of IODDT variables for the project modules and variables	Local(1)
Programming	Programming the project and functions carried by out using the AS-Interface bus	Local(1)
Configuring	Declaration of modules and slave devices	Local
	Configuring the module channels
	Entering the configuration parameters
Documentation	Start building the documentation files concerning the project; update throughout the project	Connected(1)
Generation	Generation (analysis and editing of links) of the project	Local
Transfer	Transfer of the project to the PLC	Connected
Debug and Adjust	Debugging the project from debug screens or animation tables	Connected
Debug and Adjust	Modification of the program and the adjustment of the parameters	Connected
Operation/Diagnostics	Display of the information necessary for conducting the project	Connected
Operation/Diagnostics	Project and modules diagnostics	Connected
(1) These phases can be performed in either mode.