Maple-systems HMI5000 Series Manuel d'utilisateur télécharger pdf (Page 9)

Introduction 3

1010-1007, Rev. 10

OIT/HMI Basics

Operator Interface Terminals (OITs) and Human Machine Interfaces (HMIs) provide much more versatility than

traditional mechanical control panels. An OIT allows a plant floor operator to monitor current conditions of a control

system and, if necessary, to initiate a change in the operation of the system. OITs connect to programmable logic

controllers (PLCs) typically through the PLC’s serial communications port. The OIT can be programmed to monitor and

change current values stored in the data memory of the PLC.

OITs can have either text-based or graphics-based displays. A text-based OIT can display printable text characters but

no graphics. Some text-based OITs can display text characters in various sizes. A graphics-based OIT can display

printable text characters of varying fonts and sizes and graphics shapes such as icons, bitmaps, or pictures. Using

pictures instead of words or characters often greatly simplifies the operation of the OIT, making the OIT much more

intuitive to use.

Some OITs use touchscreen displays while others use a membrane-style keypad. Membrane-style keypads are best

used in applications in which the keypad is likely to become dirty. Touchscreen displays are placed over the OIT

screen thus providing much more flexibility than typical membrane-style keypads. Because of this, switches can be

created on a touchscreen that appear only when needed.

The Maple Systems HMI5000 Series are graphics-based touchscreen OITs. The terms OIT and HMI can be used

interchangeably, so we will use HMI in most cases. Now let’s define some terms that are used throughout the

EasyBuilder-5000 Help files.

Projects

The HMI has two basic segments of internal memory. The code memory contains the information required by the HMI

that controls how it operates such as the features supported and how it communicates to a PLC. The HMI

programmer does not have the ability to change code memory. The project memory pertains to all the window

screens created and any other features that the HMI programmer can create using the EZware-5000 configuration

software. Therefore, the term project is used to designate the file that is sent to the HMI from the EZware-5000

software.

Backing Up Projects

We recommend that you frequently back up your projects to another folder or an

external or network drive. In addition, when you have completed a project,

archive it by running the compression utility (Tools > Compress/Uncompress),

which bundles the project with the libraries that are associated with the project.

This allows the project to be opened on another computer and retain all the

shapes and pictures that are linked to the project. Refer to the Help menu for

more information (Help > Help Topics > Contents > How Do I…Backup a Project?).

Objects

An object is any ‘thing’ that performs an action while the HMI is communicating to the PLC. In order to get the HMI to

‘do anything’, you must program the HMI with objects. Objects perform actions such as display text or graphics, write

a value to a PLC register, or display an alarm. Objects most often are graphics shapes that are to be displayed on the

HMI screen. For example, a Text Object is used to display text on the HMI. But objects are also used to configure the

HMI to perform some action. For example, a PLC Control Object tells the HMI to continuously monitor a PLC register

that is used by the PLC to request a new window. Some objects can display a graphics shape on the HMI screen and

perform some action. For example, a Toggle Switch Object creates a graphic object on the HMI that, when pressed,

activates a bit in the PLC.

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Maple-systems HMI5000 Series Manuel d'utilisateur Page 9

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