Language Elements In A Control System Flowchart - Siemens SIMATIC S5 Manual

IP 265
9.3.2

Language Elements in a Control System Flowchart

The COM 265 language elements and their representation in a control system flowchart are very
closely based on STEP 5 (which is used to program SIMATIC CPUs).
In addition to the familiar STEP 5 language elements, a number of new language elements have
been implemented for programming the IP 265:
• The majority of COM 265 language elements are relevant logic operations which can also be
programmed with STEP 5. In CSFs used to program CPUs, they do not exist as autonomous
language elements, but rather are generated by using flags and interconnecting segments.
• There are also a number of COM 265 language elements which cannot be programmed in
STEP 5, and which would not serve a practical purpose in that language, such as high-frequency
clockpulse generators and timers with time values in the millisecond range.
The additional language elements, as well as other process-related differences between the CSFs
used for programming the IP 265 and the CSFs used for programming CPUs are emphasized in the
text by the use of italics.
Note
Edge-sensitive inputs of the COM 265 language elements are explicitly marked with
" " (positive edge sensitivity) or "
>
The COM 265 language scope includes the following language elements:
• Binary logic operations (Page 9-12)
• Set/Reset operations (Page 9-13 f.)
• Timer operations (Page 9-18 f.)
• Clockpulse generator (Page 9-22)
• Counter operations (Page 9-23 f.)
• Comparison operations (Page 9-25)
• Connectors (Page 9-26)
• Distributors (Page 9-26)
• Connection element (Page 9-26)
Note
The IP 265 has no retentive memory areas.
EWA 4NEB 812 6130-02a
Programming the IP 265 with COM 265
" (negative edge sensitivity).
<
9-11