Siemens LOGO! Series Manual page 399

Notes on communication
NOTICE
Communication errors caused by address conflict
Communication errors can occur if several devices in a network share the same bus
address or IP address.
Make sure that your HMI device is assigned a unique address in the network.
Note
Updating tag values following a communication error
If communication between an HMI device and PLC is interrupted, all tag values displayed on
the HMI device will be replaced by a hash mark ("#").
When the communication between the HMI device and PLC is restored, all tag values will be
updated immediately. The cycle time for updating the tag values begins again at "0."
Ethernet communication with Basic Panels PN
Basic Panels PN support the following types of communication:
• PROFINET basic function for commissioning and diagnostics
• Standard Ethernet communication
Basic Panels
Operating Instructions, 04/2012, A5E02421799-03
Safety instructions
2.3 Notes about usage
27