CAN-CBX-AI420 - esd electronics, Inc.

8.8.7 Analogue Input Interrupt Delta (6426 h)
Index
[Hex]
6426
Subindex
[Dec.]
Description
Value range
[Hex]
Device Profile Area
Default
[Dec.]
Data type R/W
0 Number_of_Analogue_Inputs 4 4 unsigned8 ro
1 Analogue_Input_IRQ_Delta_1 0...FFFFFFFF 0 unsigned32 rw
2 Analogue_Input_IRQ_Delta_2 0...FFFFFFFF 0 unsigned32 rw
3 Analogue_Input_IRQ_Delta_3 0...FFFFFFFF 0 unsigned32 rw
4 Analogue_Input_IRQ_Delta_4 0...FFFFFFFF 0 unsigned32 rw
In this object the difference value of the analogue input voltage (Delta), which can be evaluated for
triggering the interrupt, is defined. Via object 6421 h the type of evaluation is selected. The interrupt
function is enabled via object 6423 h.
Positive and negative changes of the voltage are evaluated, although the value contained in object 6426 h
is always a positive value.
Value range:
Value of the variable
Analogue_Input_IRQ_Delta_x Change of voltage
[Hex]
0 0
: :
FFFF FFFF +20.00 V
Note: For the voltage difference calculation the objects 6401 h, or 6402 h are evaluated,
which are calculated from gain, offset, Accu_N (object 2402 h) and Average_N
(object 2403 h).
It can be expedient, to use the lower-order bits of the 32-bit variable
Analogue_Input_IRQ_Delta_x, because resolutions higher than 14 bit can be
achieved by the addition of the measured values. However, the technical limits of
the hardware have to be taken into account at this.
Note : If only the 16 higher-order bits of the A/D-converter values are used (object 6401 h
mapped), then only the 16 higher-order bits of the 32-bit value of the object 6426 h
are evaluated!
CAN-CBX-AI420 Manual Rev. 1.3 69