Siemens SIMATIC HMI Operating Instructions Manual page 60

Planning application
3.6 Effective ranges and zones
A zone is defined by the maximum distance of the HMI device from one or more
transponders. The same maximum distance applies to all transponders in a zone. The
assignment of transponders to zones is defined in the project.
Example
The figure below shows an example with two zones:
①
②
Transponder
Each transponder has a unique ID. The transmitting range of the transponder approximates
to a lobe shape with a range of approximately 8 m.
The ID is set directly on the transponder. The set ID must match the project
parameterization.
Distances are measured as follows:
● The HMI device sends signals in the current project
● The transponder responds to the signal from the HMI device and sends its ID to the HMI
● The HMI device measures the distance between it and the transponder(s).
Thus the HMI device determines which effective range/zone it is currently in.
Rules governing transponders
The following rules apply to assigning transponders:
● A transponder can only be assigned to one zone.
● A transponder can only be assigned to one effective range.
● A transponder can be assigned to a zone and an effective range simultaneously.
60
Zone 1, formed by 2 transponders
Zone 2, formed by 1 transponder
device
Mobile Panel 277F IWLAN
Operating Instructions, 12/2007, A5E01003940-01