To Next Page

To Previous Page

PLC

250 9836 3521 01

To execute a program the Resource uses one or more tasks. A task controls the time scheduling of a

program. Tasks are typically cyclic which means that they are executed periodically with a given time

interval. The Setup Wizard creates one task named T10MS, which is executed every 100th millisecond,

for each of the resources.

The program that is executed by a task is called POU, or Program Organization Unit. The Setup Wizard

creates one POU for each station in the system. They are named Main01 for the first station, Main02 for

the second, and so on. When created all Main programs looks the same since they are copied from the

PowerMACS standard template. Normally you must adopt the program for each individual station. You do

that by double clicking on the icon representing the variable worksheet (MainNNV) and/or the icon

representing the logic worksheet (MainNN) of the program of interest.

Each resource has a number of variables that are global within the resource. These are defined on the

worksheet named Global_Variables and can be used in all your programs (POUs) executed by the

resource.

The variables defined on Global_Variables are divided in the following groups:

 Default and Global_Variables: - Consists of a number of PLC internal variables that can be used

for advanced debugging of your PLC program.

 System_Globals: - This group contains all variables interfacing the PLC with the tightening

controller part of the PowerMACS system. See System Globals for details.

 ExtCom_API_Variables: - This group contains variables that are mapped to optional external

communication and/or API devices. See Serial Communication and API, Application

Programmers Interface for how this is configured and used.

 CycleData_Variables: - This group contains variables that are mapped to the optional cycle data

interface. See the description of PLC in chapter: Peripheral Devices, for how this is done.

 DC_PLUS_Variables: - This group contains all PLC variables used for interfacing a DC PLUS

server. See the description of DC PLUS in chapter: Peripheral Devices, for how this is done.

 AUDI_XML_Variables: - This group contains all Audi XML device variables.

 Shared_Variables: - This group contains variables that are shared between the optional fieldbus

interface and the digital I/O interface. See chapter: Fieldbus Interface for how this is done. See

I/O Device for a detailed description.

Atlas Copco PowerMACS 4000 User Manual

Questions and Answers: