Fig. 8-3: Interrupt Logic - Digital Inputs 1-8 - Addi-Data APCI-1500 Technical Description

APCI-/CPCI-1500
Example: Port 1 (digital inputs 1-8), AND-logic
Event for generating an interrupt:
Digital input
Event mask
The following events generate an interrupt:
Inputs 2 and 4 and 5 = 0 V
Inputs 1 and 3 and 6 = 24 V
Input 8 = rising edge
Input 7: No meaning
Example: Port 1 (digital inputs 1-8), OR-logic
Event for generating an interrupt:
Digital input
Event mask
The inputs 5-8 have no meaning.
An interrupt will be generated if a voltage of 24 V will be connected to input 1 or
input 2.
Please observe: The OR-event if fulfilled as long as at least one of the two inputs
is on 24 V.
The meaning in this case is:
- If input 1 switches to 24 V and input 2 stays on 0 V, an interrupt will be
generated
- If input 2 switches from 0 v to 24 V, while input 1 stays on 24 V, no
Fig. 8-3: Interrupt logic – Digital inputs 1-8
8 7 6 5 4 3 2 1
3 X 1 0 0 1 0 1
8 7 6 5 4 3 2 1
X X X X 0 0 1 1
Functions of the board
35