Watchdog And Reset; Fig. 8-2: Schematic Diagram Of The Watchdog Circuitry - Addi-Data ADDIALOG PA 358 Technical Description

PA 358
8.3

Watchdog and reset

The PA 358 board is equipped with a watchdog circuitry, which you can enable
through J24. Three different times are available (5 ms, 500 ms, 5 s), which you can
jumper-select through J23. The schematic circuit diagram is as follows:

Fig. 8-2: Schematic diagram of the watchdog circuitry

If within the selected time none of the output channels is accessed, i.e no new value
is written on one of them, then all outputs are reset, depending on the adjustment [J1,
J6, J11, J16], to Unipolar zero or Bipolar zero.
One jumper adjusts two output channels.
Depending on the jumper adjustment
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If the jumper is set, then the corresponding unit is loaded after reset with
0000Hex (Unipolar zero).
Example: If the range ± 10 V is selected, then the output voltage obtained
after reset or watchdog time is - 10 V.
If the jumper is not set, then the corresponding unit is loaded with the value
0800Hex after reset (Bipolar Zero).
Example: If the range ± 10 V is selected, then the output voltage obtained
after reset or watchdog time is 0 V.
Technical description
Time: 5 ms
Time: 500 ms
Time: 5 s
Chapter 8