Programming the FM 352
7.7 Evaluation of a hardware interrupt
FM 352 electronic cam controller
Operating Instructions, 05/2011, A5E01071724-03
53
7.7 Evaluation of a hardware interrupt
If the FM 352 triggers a hardware interrupt, the following information is available in the
OB40_POINT_ADDR variable (or in the corresponding variable of a different hardware
interrupt OB):
Table 7- 1 Content of double word OB40_POINT_ADDR
Byte Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
0 0 0 0 0 0 0 0 0
1 0 0 0 0 0 Cam 0 0
2 Cam 7 on Cam 7 off Cam 6 on Cam 6 off Cam 5 on Cam 5 off Cam 4 on Cam 4 off
3 Cam 3 on Cam 3 off Cam 2 on Cam 2 off Cam 1 on Cam 1 off Cam 0 on Cam 0 off
You can see the cause of the interrupt in byte 1.
Cam: Evaluate bytes 2 and 3 according to the table.
Lost hardware interrupts
If the hardware interrupt OB is still busy processing a hardware interrupt, the module
registers all subsequent hardware interrupt events. If an event occurs again before the
hardware interrupt could be triggered, the module triggers a "hardware interrupt lost"
diagnostic interrupt.
To Next Page
Loading...
