Siemens S7-400 Hardware Interrupt, Instance Data Block, Interface, Multipoint, Interrupt, Cyclic

Glossary

H

Hardware Interrupt

Interrupt-triggering modules trigger a hardware interrupt in the case of a certain event in the process. The hardware interrupt is signalled to the CPU. In accordance with the priority of this interrupt, the corresponding organization block is then executed.

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

→Multipoint Interface.

Interrupt, Cyclic

→Cyclic Interrupt

Isolated

In the case of isolated I/O modules, the reference potentials of the control and load circuits are galvanically isolated from each other, for example, by optocouplers, relay contacts, or transformers. The I/O circuits can be connected to a common potential.

Automation System S7-400	Hardware and Installation	Glossary-7
A5E00850741-01