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Glossary-10

ET 200S IM 151-7 CPU Interface Module

A5E00058783-04

Runtime Error

Error which occurs during processing of the user program on the programmable

controller (i.e. not in the process).

Scan Cycle Checkpoint

The point during CPU program scanning at which the process image is updated,

for example.

SFC  System Function

Slave

A slave may only exchange data with a  master if prompted by the master to

do so. By slaves we mean, for example, all DP slaves such as ET 200S,

ET 200B, ET 200X, ET 200M, etc.

Stand-alone operation

The device is operated on a stand-alone basis without data exchange to a

superordinate master and without direct communication with other DP slaves. All

the modules power up using default parameters and with the maximum

configuration (32 slots, 64 bytes consistently).

START

The STARTUP mode is run through when the system goes from the STOP mode

to the RUN mode.

Can be triggered by the mode selector or after power on or an operator action on

the programming device. In the case of the ET 200S a restart is carried out.

Start Event

Start events are defined events such as errors, times and interrupts. They cause

the operating system to start an associated organization block (if programmed

accordingly by the user). Start events are displayed in the header information of

the associated OB. The user can respond to start events in the user program.

STEP 7

Programming language for developing user programs for SIMATIC S7 PLCs.

Subscriber

A recipient in direct communication See Direct Communication

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