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III
Table of Contents
Preface 5
Getting Started 6
The Sample Application 6
Starting a New Project: 6
Saving a Project: 7
Displays: Operator Password 8
Display 1: Enter ID no. 8
Creating Display 1 8
Creating a Field 9
Attaching a Variable 9
Formatting a Keypad-Entry Variable 10
Setting a Jump Condition 12
Display 2: Access Okayed/Denied 13
Editing Display 2 14
Formatting Variable9: 14
Setting Jumps 15
Display 3: Welcome __________ 16
Editing Display 3: 16
Formatting List Variable 7 17
Review 18
How to Build a Net 19
Building Net 1 19
Connecting Elements 22
Ladder: Operator Password 24
Approving the Password 24
Copying and Pasting Ladder Elements 24
Conditional Text—Access: Okayed/Denied 27
Enlarging a Net 27
Jump to Display 3: Timer 28
Starting a Timer 28Using the Timer’s Bit Value 29
Jump to Display 1: Timer 30
Review 31
Resetting Coils 31
Inserting New Nets in the Ladder 31
Resetting MB 10, 11, and 12 32
Initializing MI 4 33
Inserting a ‘Comment’ 34
Downloading a project 34
Testing Your Project: Debug 35
Displays: Entering Parameters 37
Display 4: Set Box Quantity 37
Editing Display 4 37
Creating a Field 37
Attaching a Variable 38Formatting a Keypad-Entry Variable 38
Setting a Jump Condition 39
Display 5: Start Time 41
Editing Display 5 41
Programming the M90
4
Creating a Field and Attaching a Variable 41
Formatting a Keypad-Entry Time Variable 42
Setting a Jump 43
Display 6: End Time 44
Editing Display 6 44
Creating a Field and Attaching a Variable 44
Formatting a Keypad Time Entry Variable 45
Setting a Jump46
Review: 46
Displays: Displaying Run-Time Data 47
Display 7: Box Count 47
Editing Display 7 47
Creating a Field and Attaching a Variable 47
Formatting a Display Variable 48
Creating a Field and Attaching a Variable 48
Formatting a Display Variable 49
Setting Jumps 49
Display 8: Operator Messages 51
Editing Display 8 51
Creating a Field and Attaching a Variable 51
Formatting ListVariable 8 52
Setting Jumps 53
Review: 54
Ladder: Maintenance Time 55
Net 11: Machine Cannot Run 55
Using Indirect Time Functions: Clock 55
Ladder: Starting the Bundling Machine 57
Starting the Machine 57
Direct Clock Functions: Day Of The Week 57
Counting the Boxes 58
Building the Counter 59
Initializing the Counter 60
Ladder: Operator Messages 61
Stuck Box: Timer 0 61
ConveyorStopped: Timer 1 62
Activate Timer 1 62
Display Line 0: Bundle Complete 63
Display Line 1: Stuck Box 64
Display Line 2: Conveyor Stopped 64
Exiting Display 8 65
Exiting ‘Bundle Complete’ 65
Exiting ‘Box Stuck!’ and ‘Conveyor Stopped’ 66
Exit Box Stuck, Return to Box Count 67
U90 Ladder Tutorial
5
Preface
Unitronics’ M90 OPLC is a micro-controller with an on-board I/O configuration and an
HMIoperating panel. M90 OPLC automation projects are written on a PC using U90
Ladder software, and then downloaded into the M90.
Automation projects include the:
• Ladder application, which is the control program that enables the M90 to carry out its
automation task. You write this application using the Ladder editor.
• HMI application, which customizes the M90-operator interface.
You designthe messages the M90 displays on its LCD screen and customize the keypad
using the HMI editor.
This tutorial teaches the basics of U90 Ladder programming step-by-step. When you
complete it, you will know how to create projects using:
• Displays • Variables
• Timers • Counters
• Math Functions • Compare Functions
• Store Functions
To get the most from the tutorial, connect your PC to theM90 controller. This allows you to
download and test the project.
M90 Features
The M90 offers a number of advanced features, including:
• CANbus/RS232 Networking
• I/O Expansion
• Modem Communication
• Remote Programming and Trouble-shooting
• SMS messaging
To learn more about these and other features, refer to the M90’s on-line help system.
M90 Sample Programs
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