Enter Ip 265 User Program; Rules And Recommendations For Programming - Siemens SIMATIC S5 Manual

IP 265
9.4

Enter IP 265 User Program

9.4.1

Rules and Recommendations for Programming

In the following sections, you will find
• Information on quantity framework restrictions for the IP 265
• Information on quantity framework restrictions for COM 265
• Tips for optimum utilization of the IP 265
• Rules for referencing operands in the IP 265 user program
Please read each "Note" carefully before attempting to program the IP 265. They can make startup
of the IP 265 easier.
Information on quantity framework restrictions for the IP 265
Remember:
The IP 265 user program is stored on the IP 265 in the form of a hardware structure, whereby the
language elements are spatially placed on the IP and connected to one another via "connecting
lines".
Both the language elements and the connections require memory space (resources) on the IP 265.
The resources for the language elements and for the necessary connections are available only to a
limited degree.
Note
The IP 265's program capacity is limited. The IP 265 user program's capacity re-
quirements depend on:
• the language elements used and
• the interconnection of these language elements in the control system flowchart
COM 265 provides sophisticated aids for estimating the size of the IP 265 user program during the
editing phase. An estimation of the IP 265 capacity on-load accorded to the IP 265 user program is
displayed on the message line in the "Editor" screen form. The capacity display is updated during
the entry of COM 265 language elements and operands.
Note
In Section 9.5.1 of the Product Manual you will find an overview table containing the
percentage memory requirements for the various language elements, on a number of
various interconnection options.
EWA 4NEB 812 6130-02a
Programming the IP 265 with COM 265
9-27