Control Techniques UD70 User Manual

UD70
Issue code: 70nu2
DPL programming 4-3
4.3 Variables
Basic variables
There are two basic types of variable, as follows:
• Integer variable (
INT)
• Floating-point variable (
FLOAT)
Integer
variables
Integer variables are denoted by placing a % % symbol after the name of the
variable, and are internally represented by a two’s complement
32-bit number. This gives a decimal range of ±2147483647.
Floating-
point
variables
Floating-point variables have no symbol. These variables are
IEEE double-precision (64-bit) numbers which give a range of approximately
±1.7976 x 10
±
308
.
Accessing the variables
All variables are global within a program (ie. they can be accessed and
altered by any task). (There are no local variables.)
Bit-addressing of variables
All integer variables and arrays (see below) may be bit-addressed. This
means that each individual binary bit in the variable may be separately read
or written to. Bit-addressing is achieved by appending .n.n to the end of the
variable name, where nn is the bit number to be accessed.
Example flags%.3 = 1 ;set bit 3 to 1
IF flags%.5 = 1 THEN ... ;check bit 5
Naming conventions
The first character of a variable must be a letter. Subsequent characters
may include letters, numbers and the underscore (_) character. These may
be in any order.
Variable names are case sensitive (eg. the variable name speed%speed% is not the
same as SPEED%SPEED%).
Preferred use of variables
It is recommended that integer variables are used where possible.
Operations on integer variables perform much faster than for
floating-point variables.

Control Techniques UD70 Specifications

General

Brand	Control Techniques
Model	UD70
Category	Control Unit
Language	English

Summary

Safety Information

General Information

Introduction to UD70 and DPL Toolkit

UD70 Overview and DPL Toolkit Basics

Explains the UD70 as a microcomputer for Unidrive flexibility and the DPL Toolkit for software development.

UD70 Memory and PC Requirements

Details UD70 memory storage and minimum PC specifications for DPL Toolkit.

Technical Data and User Knowledge

Lists UD70 technical specifications and assumes basic Windows knowledge for users.

Installation and Configuration

Installation Procedure

Instructions for physically fitting the UD70 module into the Unidrive.

System Configuration and DPL Toolkit Setup

Details host PC connections (RS232) and installing the DPL Toolkit.

DPL Toolkit Operations

DPL Toolkit Overview and File Management

Introduces the DPL Toolkit's capabilities and file handling procedures.

Editing Programs and Applying Styles

Covers editing code, using styles, and auto-indent features within the DPL Toolkit.

Compiling and Running Programs

Details the process of compiling DPL programs and executing them on the UD70.

Serial Communications

Serial Communications Introduction

Explains serial communication links using RS485 for UD70 systems.

Hardware Connections and ANSI Protocol

Details RS485 hardware connections, ANSI communications fundamentals, and frames.

Serial Modes and ANSI Instructions

Outlines various RS485 modes and available ANSI instructions for communication.

Reference Guide

UD70 Tasks and Programming Structures

Explains different task types (INITIAL, BACKGROUND, CLOCK) and their roles in UD70 programming.

DPL Instructions and Functions Reference

Details various DPL programming instructions and mathematical/signal-processing functions.

UD70 Features

PLC Parameters and Feature Introduction

Introduces PLC parameters and the UD70's advanced position control and profile generation capabilities.

Encoder Lines, Position, and Controller Setup

Explains encoder line units, position calculation, and enabling the position controller.

Default Values and Parameter Descriptions

Details default reset values and provides descriptions for various UD70 parameters.

Logic Diagrams and Digital Lock Control

Illustrates logic diagrams for position control and explains digital lock functions.

Cam Function and Reference Switching

Describes the cam function for slave axis control and switching between control modes.

Timer/Counter Unit and Digital I/O Ports

Details the UD70's timer/counter unit and digital I/O port functionality.

Memory Storage and RS232 Communications

Covers non-volatile memory storage and using the RS232 port for Drive-to-Drive communication.

Diagnostics and Error Handling

Run-time Errors and Trip Codes

Explains run-time errors, their causes, and provides a list of trip codes with their actions.

Compiler Errors and Advanced Error Handling

Lists compiler error messages and details advanced error handling using the ERROR Task.

UD70 Parameters

Set-up Parameters and RS485 Modes

Details UD70 set-up parameters and the various RS485 port modes available.

Virtual Parameters and Control Words

Explains virtual parameters and the function of control and status words.

General-Purpose Parameters and I/O Box Configuration

Lists general-purpose parameters and details I/O box configuration through menus.