Appendix
A.1 Connection point recognition
Mobile Panel 177 (WinCC flexible)
Operating Instructions (Compact), Edition 07/2005
A-3
4. Select the "Internal_Box-ID" tag in the "Settings for runtime" section at the "Access point".
When you connect the HMI device to the terminal box, the box ID is written automatically
into the "Internal_Box-ID" tag.
5. When communication is established between the HMI device and controller, the old value
currently existing in the controller is then written automatically into the "External_Box-ID"
tag. The "Auxiliary Tag" is required so that the current value of the box ID can be
transferred to the PLC.
6. A program in the PLC evaluates the live bit. After the control program has determined
that communication has been established, the control program changes the current value
of the "Auxiliary_ Tag" tag once in order to induce a change in value.
7. The value change in the "Auxiliary_ Tag" executes the "SetValue" system function. The
system function now re-assigns the value of the "Internal_Box-ID" tags to the
"External_Box-ID" tags.
8. To configure this system function open the properties view of the "Auxiliary Tag". Click
"Change value" in the properties view of the "Auxiliary_Tag" tag in the "Events" group.
The "Function list" dialog box opens. Click the first line of the function list. The list opens,
showing the system functions available in the project.
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