Easy Book Manual 01/2015: Adding an HMI Device

Questions and Answers

To select the input and output parameters for the calculation

To configure the data types of the input and output parameters

To enter the mathematical equation for the calculation (correct)

To insert the CALCULATE instruction into the user program

They are not used in the CALCULATE instruction equation

They are used to calculate the scaling factor for the analog input value

They define the upper and lower limits of the scaled output value

They define the upper and lower limits of the analog input value (correct)

They define the upper and lower limits of the scaled output value (correct)

They are not used in the CALCULATE instruction equation

They are used to calculate the scaling factor for the analog input value

They define the upper and lower limits of the analog input value

Double-click the CALCULATE instruction to insert it into the user program Signup and view all the answers

To perform complex mathematical calculations on analog input values Signup and view all the answers

Scaling factor Signup and view all the answers

It represents the scaled output value calculated by the equation Signup and view all the answers

Connecting the CALCULATE instruction to the HMI device Signup and view all the answers

It represents the raw analog input value to be scaled Signup and view all the answers

The CALCULATE instruction is used to scale analog input values from HMI devices Signup and view all the answers

Study Notes

The Calculate instruction provides two input parameters and an output parameter.
The input and output parameters must be of the same data type.
For example, select the "Real" data type for the input and output parameters.
The equation for scaling a raw analog value is: Out value = ((Out high - Out low) / (In high - In low)) * (In value - In low) + Out low
The equation can be rewritten with parameter names: OUT = ((in4 - in5) / (in2 - in3)) * (in1 - in3) + in5

To create a network connection, go to "Devices and Networks" and select the Network view.
Drag a line from the green box (Ethernet port) on one device to the green box on the other device.
A network connection is created for the two devices.

To create an HMI connection, select the network connection and click the "Connections" button.
Select "HMI connection" from the drop-down list.
The HMI connection allows you to configure the HMI tags by selecting a list of PLC tags.
Alternative methods for creating an HMI connection include:
- Dragging a PLC tag from the PLC tag table, program editor, or device configuration editor to the HMI screen editor.
- Using the HMI wizard to browse for the PLC.

To create an HMI screen, use the standard set of libraries provided by STEP 7.
Insert basic shapes, interactive elements, and standard graphics by dragging and dropping them onto the screen.
Configure the appearance and behavior of the element using the properties in the Inspector window.
Drag and drop PLC tags from the Project tree or program editor to the HMI screen to create elements on the screen.
Use the properties to change the parameters for the element.