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Glossary-2

ET 200S IM 151-7 CPU Interface Module

A5E00058783-04

Consistent Data

Data that belongs together with respect to its content and that must not be

separated is referred to as consistent data.

For example, the values from analog modules must always be handled

consistently, i.e. the value of an analog module must not be corrupted by reading

it out at two different points in time.

Counter

Counters are part of the  system memory of the CPU. The content of the

“counter cells” can be modified by STEP 7 instructions (e.g. count up/down).

CPU

Central processing unit of the S7 programmable controller with a control unit and

arithmetic logic unit, memory, operating system and interface for a programming

device.

Cross communication

See Direct communication

Cycle Time

The cycle time is the time taken by the  CPU to scan the  user program

once.

Data Block

Data blocks (DB) are data areas in the user program that contain user data.

There are global data blocks that can be accessed from all code blocks and

there are instance data blocks that are assigned to a specific FB call.

Device master file

A device master file contains all the DP slave-specific properties. The structure

of the device master file (DDB) is defined in IEC 61784-1:2002 Ed1 CP 3/1.

Diagnosis

Diagnosis is the detection, localization, classification, display and further

evaluation of errors, faults and messages.

Diagnosis offers monitoring functions that are executed automatically while the

system is running. This increases the availability of the systems by reducing

maintenance and standstill periods.

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Siemens ET 7Y Series Especificaciones Pagina 194