Siemens Simatic S7-400 User Manual download pdf (Page 614)

100

101

Glossary

Glossary-8

S7-400, M7-400 Programmable Controllers Module Specifications

A5E00069467-07

Ground, to

To ground means to connect an electrically conductive part via a grounding

system to the grounding electrode (one or more conductive parts having a very

good contact to ground).

Hardware interrupt

A hardware interrupt is triggered by interrupt-triggering modules in response to a

particular event in the process (limit value violation; the module has completed

the cyclic change of its channels).

The hardware interrupt is reported to the CPU. In accordance with the priority of

this interrupt, the ³ organization block assigned to it is processed.

Input delay

Parameter in STEP 7 for digital input modules. The input delay is used to

suppress injected interference. Interfering pulses from 0 ms to the set input delay

are suppressed.

The set input delay is subject to a tolerance that can be obtained from the

technical specifications of the module. A high input delay suppresses long

interfering pulses, whereas a low input delay suppresses short ones.

The permissible input delay depends on the length of the cable between the

encoder and the module. For example, a high input delay has to be set for long

unshielded supply conductors to the encoder (longer than 100m).

Integration time

The integration time is the inverse value of the ³ interference frequency

suppression in ms.

Interface, multipoint

³ MPI

Interference frequency suppression

Parameter in STEP 7 for analog input modules. The frequency of the AC network

can interfere with the measured value, especially with measurements in low

voltage ranges and with thermocouples. This parameter is used by the user to

specify the prevailing line frequency on his system.

Interrupt

The SIMATIC S7 is familiar with 28 different run-time level, which govern running

of the user program. These run-time levels include interrupts such as hardware

interrupts, among other things. When an interrupt occurs, the operating system

automatically calls an assigned organization block in which the user can program

the reaction he wants (for example, in an FB).

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