AEG SB4 series User Manual download pdf (Page 217)

ALU 061, ALU 071

169

3.5.2 Monitoring the User Software Sequence

The sequence of the user software is monitored by measuring the cycle time. The cycle

monitoring time is adapted automatically to its circulation time for a number (specified

in the software) of Vlist circulations after the start of the Vlist. The maximum value of

the digital word multiplied by the factor 2 is then entered in the counting register of the

timer (digital word 2).

If a Vlist is to be started and its running time is shorter than the previous one, the digi-

tal word 2 is to be standardized at the start by inserting the “set” pin (boot loading) so

that a re-adaptation can take place. However, if the Vlist is longer than the previous

one, the adaptation is carried out automatically.

Warning If long program parts which considerably extend t he program circula-

tion time, e.g., bus networking, are enabled after the start (or during t he se-

quence) of the user program, the dead man’s function can detect an excess of

the monitoring time and cause the pilot c ontact to drop out.

This involantary interruption can be suppressed if the cycle monitoring time

saved in the digital word 2 is significantly enlarged using a program block (e.g.,

with an ADD) or a programming panel (PADT).

However, you are warned before extending the time since the value can then im-

pair the monitoring function.

3.6 Program Abortion

Program Abortion Disabled

Code switch 2.8 to 0

Inserting the “reset” pin has no effect

Program Abortion Permitted

Code switch 2.8 to 1

A program break is initiated if the “reset” pin is plugged in, whereby it is not guaranteed

that the user program will stop in accordance with the commands and without any data

losses. This possibility may therefore not be used in the standard system operation

(thus locked via 2.8).

1 2 ... 212 213 214 215 216 217 218 219 220 221 222 ... 430 431

No comments

AEG SB4 series User Manual Page 217