BECKHOFF C1300 - Manual (Page 36)

C1300 VME to II/O Interface Unit Beckhoff II/O-System
Page 36 of 44 Version : 2.01 Date : 18.12.95
3.4.3. Initialisation of "Fast Fiber Optic - Interrupts"
Function 0fh : Transmit interrupt request mask
The interface C1300 has 4 interrupt channels to transmit the 4 interrupt channels
of the II/O-Lightbus to the VME master via the GCB block.
The interrupt bits are generated by any module of the II/O Lightbus in any
occuring telegram frame. The IR- bit field of the control byte transports the
interrupt requests to the interface.
With the help of function 0fh, the interface C1300 is configured. It is possible to
enable a number of interupts from the four channels and to specify the signal type
to generate an interrupt request transmission from the C1300 interface to the VME
system.
Channel Length Function Argument
0
Argument
1
Argument
2
Argument
3
Argument
4
Request 07 0f 0m Criterium
Interrupt-
Channel 0
Criterium
Interrupt-
Channel 1
Criterium
Interrupt-
Channel 2
Criterium
Interrupt-
Channel 3
Response 03 0f 0m
The LOW - nibble in argument 0 specifies, which of the 4 possible Interrupt
channels are enabled.
Example:
m = 00h all interrupt channels disabled ( default )
m = 01h interrupt channel 0 enabled
m = 06h interrupt channels 1 and 2 enabled
m = 0fh interrupt channels 0, 1, 2 and 3 enabled
Every single interrupt channel can be characterized with signal criteria.
Following criterias can be definded:
Criterium Argument code
no interrupt 0
interrupt at signal rise 1
interrupt at signal fall 2
interrupt at signal toggle 3
The argument codes 0 to 3 are defined in the function parameters Argument 1 to 4
for the equivalent interrupt channels.