Technical data

Programming
CPU 317T: Technology Functions
5-6 A5E00251798-03
5.2 Runtime and programming model
Runtime model
The figure below shows the command interface between the PLC and its integrated
technology.
A command is initiated in the sequential user program (OB1 or watchdog interrupt
OBs) and written to the output buffer of the integrated technology. Several
commands can be busy at each one of the technology objects, without the need of
having to wait until the discrete commands are processed.
The status and error messages, as well as the actual values of the technology
object, are updated alongside with the technology DBs in the PLC. Updates are
carried out asynchronously to the OB XY cycle, which means that corresponding
updated actual values are available in multiple scan cycles in the user program.