Siemens S7-400 Installation Manual page 300

Glossary
I
Instance Data Block
With the S7-400, each call of a function block in the STEP 7 user program is
assigned a data block which is generated automatically. In the instance data block,
the values of the input, output and in/out parameters as well as the local block data
are stored.
Interface, Multipoint
³ Multipoint Interface.
Interface Submodules
Submodules which provide the automation computer with additional interfaces,
such as VGA, COM, PROFIBUS DP, etc.
Interrupt
The operating system of the S7-400 CPU has 10 different priority classes which
control the processing of the user program. These priority classes include
interrupts, such as hardware interrupts. When an interrupt occurs, the relevant
organization block is called automatically by the operating system in which the user
can program the required reaction to the interrupt (for example, in a function block
(FB)).
Interrupt, Cyclic
³ Cyclic Interrupt
Interrupt, Diagnostic
³ Diagnostic Interrupt
Interrupt, Hardware
³ Hardware Interrupt
Interrupt, Time-Delay
³ Time-Delay Interrupt
Interrupt, Time-Of-Day
³ Time-Of-Day Interrupt
Glossary-8
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04