P4: PLC for SINUMERIK 828D
14.1 Overview
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
1089
14.1.2.1 Data that are cyclically exchanged
Data which is exchanged between the PLC and NC on one side as well as between the PLC and HMI on the
other side.
Data to the PLC are provided by the firmware at the cyclic start of the user program. This ensures, for example,
that the signals from the NCK remain constant throughout a cycle.
The firmware transfers data from the PLC to the NKC or HMI at the cycle end of the user program.
Interface PLC ↔ NCK
The cyclic data include e.g. status signals ("program running", "program interrupted") and control signals (start,
stop) and auxiliary and G functions.
Data are structured in signals for:
• Modes
• Channels
• Axes/spindles
• General NCK signals
Interface PLC ↔ HMI
These are signals for:
• 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)
14.1.2.2 Alarms and messages
The user interface in DB1600 offers the option of displaying fault and operating messages on the HMI.
The firmware evaluates the signals that have been entered and sends these as coming and going alarms and
messages to the HMI where they are displayed. The HMI manages the fault texts.
14.1.2.3 Retentive data
For the retentive data there are the user data blocks DB9000 - DB9063 and the data area DB1400.DBW0 -
DBW127. There the user can store all data that should remain valid after POWER OFF/ON. The retentive data is
stored in the non-volatile memory, however, not for data backup.
14.1.2.4 Non-retentive data
Non-retentive data (e.g. bit memories, timers and counters) are deleted every time the control is booted.
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