Protected Synchronized Actions - Siemens SINUMERIK 840Di sl Function Manual

Detailed description
2.6 Control and protection of synchronized actions
Reading/writing of PLC data
PLC data can also be read and written from the part program by transferring parameters
between the NCK and PLC via the VDI interface. This is an option: PLC variables.
References:
/FB1/ Function Manual, Basic Functions, Basic PLC Program (P3)
Parameters can also be accessed from synchronized actions, thus allowing PLC data to be
transferred to the NCK for parameterization before an axis function is initiated. The system
variables to be addressed can be found in
References:
/PGA1/ Parameter Manual, System Variables
2.6.2

Protected synchronized actions

Global protection
An area of write-protected synchronized actions can be defined via the machine data:
MD11500 $MN_PREVENT_SYNACT_LOCK (protected synchronized action)
Synchronized actions with ID numbers within the protected area, once they are defined, can
no longer be:
• Overwritten
• Deleted (CANCEL) or
• Disabled (LOCK).
Protected synchronized actions cannot be disabled via the PLC either. They are indicated to
the PLC as non-lockable in the interface. See Chapter "Control via PLC".
Note
The functionality is also used for Safety Integrated systems.
Applications
The end customer must be prevented from modifying reactions to certain states defined by
the machine manufacturer.
The machine is commissioned by the manufacturer without protection. This enables the
gating logic to be defined and tested. However, the manufacturer declares the range of
synchronized actions he has used as protected before the system is delivered to the end
customer, thus preventing the end customer from defining his own synchronized actions
within this protected area.
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Function Manual, 11/2006, 6FC5397-5BP10-2BA0
Synchronized actions