AEG SB4 series User Manual Page 193

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34
ALU 011, ALU 012, ALU 021
181
3.4.2 Monitoring of the user software
(Watchdog 2 with W19 solder tag)
The scan time of the running software is monitored with this circuit. The circuit operates
the dead man’s relay and the ”run” LED. If the monitoring time is exceeded, the pilot
relay drops out and the green ”run” LED goes out.
The monitoring time is set to approx. 1.1 s by the factory. It can be
varied between 220 ms and 600 ms by soldering in an R resistor
on the W19 tags. The corresponding resistor value is to be taken
from the following diagram (delivery without resistor).
Warning The short -circuiting of the solder tags is not allowed. R permissible:
>
220 kOhms
200
t[ms]
220 330 390 470 560 680 820 1000
R [kOhm]
320
400
560
270
275
235
450
500
365
Figure 82 Resistor for the scan time monitoring on the ALU 011
3.4.3 Starting the user program
The type of program start is set with the W13 jumper. Its action corresponds to the M5
jumper for the UKA 024 monitoring module.
Automatic start
The signal DSR (2--1) or DCD (2--4) is switched through to
the ALU (the selection of DSR or DCD depends on the soft-
ware). The user program of the programmable controller is
started automatically when the supply voltage is switched on
(delivery status: 2 -- 1)
Manual start
The signal DSR/DCD is interrupted and set to high” for the
ALU. The programmable controller remains as stopped when
the supply voltage is switched on and must be started manu-
ally via the programming panel.
R
W19
123
4
W13
123
4
W13
123
4
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