P4: PLC for SINUMERIK 828D
14.3 Programming
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
1119
14.3.3 Operation set
The PLC of SINUMERIK 828D provides the following operation groups:
• Bit logic operations
• Fixed-point arithmetic
• Interrupt operations
• Floating-point arithmetic
• Program control operations
• Shift/rotate operations
• Transfer operations
• Conversion operations
• Comparison operations
• Logical operations
• Counters
•Timers
• Subprograms
You can take details from the online help of the Programming Tool PLC828 and the S7-200 System Manual.
14.3.4 Data classes
14.3.4.1 Defining data classes
Overview
Data classes are user-related organizational units for programs and data blocks as project subcontainer.
They are special in so much that they mutually demarcate the contents: The data and programs assigned to
them can be handled as group - i.e. as data class. This applies when loading into the control and from the control
as well as for data backup using export and import.
SM0.6 This bit represents a clock cycle. It is switched-on for one cycle and
switched-out for the next cycle. So you can use this bit as a cycle counter
input.
SM0.7 This bit indicates the position of the mode switch (TERM - off, RUN - on). If
this bit is used to enable freely programmable communication, if the switch is
set to RUN, then you can enable normal communication with the
programming device by setting the switch to TERM.
Special bit memories
(write protected)
Description
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