Abstract： IEC 61131-5:2000 pdf free download.Programmable controllers -Part 5: communications. 5.4 Software model Figure 5 shows the PC software model defined in IEC 61131-3. figure 1. It illustrates the basic high-level language elements of the PC p...
IEC 61131-5:2000 pdf free download.Programmable controllers -Part 5: communications.
5.4 Software model
Figure 5 shows the PC software model defined in IEC 61131-3. figure 1. It illustrates the basic high-level language elements of the PC programming languages and their interrelationships. These consist of elements which are programmed using the languages defined
in IEC 61131-3. i.e. programs and function blocks; and configuration elements, namely, configurations. resources, tasks, global
variables, and access paths, which support the installation of programmable controller programs into programmable controller
systems.
A configuration is the language element which corresponds to a programmable controller system as defined in IEC 61131-1. A resource corresponds to a signal processing function and its man-machine interface and sensor and actuator interface functions (if any) as
defined in IEC 61131-1. A configuration contains one or more resources, each of which contains one or more programs executed under the control of zero or more tasks. A program may contain zero or more function blocks or other language elements as defined in
IEC 61131-3.
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