BECKHOFF C1220 - Manual (Page 20)

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Software description of functions 20
Beckhoff Lightbus - PC interface card C1220
Argument Channel Length Function
0 1 2 3 4
Request 07 0x0f 0m Criterion
for
interrupt
channel 0 Criterion
for
interrupt
channel 1 Criterion
for
interrupt
channel 2 Criterion
for
interrupt
channel 3
Reply 03 0x0f 0m
The LOW nibble in the argument 0 specifies which of the 4 possible
interrupt channels is to be enabled.
Example: m = 0x00 all interrupt channels disabled (Default)
m = 0x01 Interrupt channel 0 enabled
m = 0x06 Interrupt channels 1 and 2 enabled
m = 0x0f Interrupt channels 0, 1, 2 and 3 enabled
Each interrupt channel can be characterized by way of a criterion.
The following criteria can be selected:
Criterion Interrupt-Channel(0,1,2,3)
no Interrupt 0
Interrupt on positive edge 1
Interrupt on negative edge 2
Interrupt on edge change 3
The respective criteria are assigned to the interrupt channels by way of the
arguments 1 to 4.
Example:
Argument Channel Length Function
0 1 2 3 4
Request 07 0x0f 0x0c 00 00 01 03
Interrupt enabling for channels 2 and 3
Interrupt criterion for interrupt channel 0
no interrupt transfer
Interrupt criterion for interrupt channel 1
no interrupt transfer
Interrupt criterion for interrupt channel 2
Interrupt transfer with a positive edge
Interrupt criterion for interrupt channel 3
Interrupt transfer with an edge change