Siemens ET 7Y Series Spezifikationen PDF herunterladen (Seite 200)

Glossary-8

ET 200S IM 151-7 CPU Interface Module

A5E00058783-04

Organization block

Organization blocks (OBs) form the interface between the operating system of

the CPU and the user program. The sequence in which the user program is

processed is defined in the organization blocks.

Parameter

1. Variable of a STEP 7 code block

2. Variable to set the behavior of a module (one or more per module). Each

module is delivered with a suitable default setting, which can be changed by

configuring the parameters in STEP 7.

PD  Programming device

PLC

 Programmable logic dontroller

Priority class

The operating system of an S7-CPU provides up to 26 priority classes (or

“runtime levels“) to which various organization blocks are assigned. The priority

classes determine which OBs will interrupt other OBs. If one priority class holds

several OBs, the OBs do not interrupt each other but are processed sequentially.

Process Image

The process image is part of the  system memory of the CPU. The signal

states of the inputs are written into the process input image at the start of the

cyclic program. At the end of the cyclic program, the signal states in the process

output image are transferred to the outputs.

Process Interrupt

The process image is part of the  system memory of the CPU. The signal

states of the inputs are written into the process input image at the start of the

cyclic program. At the end of the cyclic program, the signal states in the process

output image are transferred to the outputs.

1 2 ... 195 196 197 198 199 200 201 202 203 204 205 ... 213 214

Keine Kommentare

Siemens ET 7Y Series Spezifikationen Seite 200