
Simple example
2.6 Create HMI screen
STEP 7 Basic V10.5
66 Getting Started, 12/2009, A5E02651459-01
2.6.4 Creating and configuring graphic objects
2.6.4.1 "Machine ON/OFF" button
Introduction
The following steps show you how to create the "Machine ON/OFF" button and how to
connect it to the PLC tag "ON_OFF_Switch" using an external HMI tag. You can use this
approach to modify the process values of the PLC tag by means of the HMI screen.
External HMI tags
You use an external HMI tag to access a PLC address. This allows you, for example, to input
a process value via an HMI device or to directly modify process values of the control
program via a button. Addressing takes place via the PLC tag table in the PLC linked to the
HMI device. The PLC tag is linked to the HMI tag with the symbolic name. This means you
do not have to adapt the HMI device when you change the address in the PLC tag table.
Requirements
The HMI screen is open.
Procedure
To connect the "Machine ON/OFF" button with the PLC tag "ON_OFF_Switch", follow these
steps:
1. Delete the standard text field "Welcome..." from the HMI screen.
2. Create a button.
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