P4: PLC for SINUMERIK 828D
14.5 Data interface
Basic Functions
1152 Function Manual, 09/2011, 6FC5397-0BP40-2BA0
14.5.2 PLC-HMI interface
DB1700, 1800, 1900
These signals have already been specified in the diagrams of Chapter PLC-NCK interface [Page 1147].
A reference is again made to what has been stated under Data interface [Page 1147]:
Data received from the HMI and destined for the NC are not automatically entered into the NC interface range. In
fact, these signals and data must be marshaled by the user program.
It involves the following signals:
• Program selection via lists
• Messenger control command
• General signals from/to HMI
• Signals from/to the maintenance planner
• Signals from operator panel (retentive area)
• General selection/status signals from/to HMI (retentive area)
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