Operating The Board; Fig. 8-4: Description Of The Task - Addi-Data ADDIALOG PA 358 Technical Description

PA 358
8.6

Operating the board

Base address
Adjust the base address of the board. Depending on the version, the board occupies
8, 12 or 16 bytes.
Watchdog
If you use the watchdog, jumper-select the watchdog time through J23
(5 ms, 500 ms, 5s ).
Be attentive to the fact that for triggering Base address +0 or +4/+8/+12 have to be
written within the defined time.
The watchdog circuit is enabled through jumper J24. If you work with the watchdog,
then you cannot debug per software, as in this case no triggering is possible within
the necessary time interval.
Description of a task
In a chemical process, four control circuits are to be supervised and positioned
per PC:
The PID controllers are analog controllers.
The predetermined value is set via a 4-20mA current loop;
it is possible to read it back.
The actual value is connected to the PID controllers with a 4-20mA current loop, it is
also to be supervised and recorded in order to obtain a daily production report.
Alarms can also be set via PC, so that an electric hooter sounds if the limit values are
exceeded.
With the PA 358 board, you can control up to eight current loops.
With the PA 302-16 board, you can write in up to eight current loops
(Differential mode).
The tasks is realized as follows:
One PA 302-16 board with the option DC (Differencial Current)
One PA 358-4C board with the option Current Output (Channel 0 to 3)
One PA 1500 board with 16 in- / 16 outputs 24V, optically isolated, to control the
relay, electric hooter, etc....
32

Fig. 8-4: Description of the task

Technical description Chapter 8