Siemens SIMATIC CM35 Manual page 78

Hardware
interrupts
CM35 Counter Module
(4) J31069-D0416-U001-A5-7618
You can use the ²interrupt generation² variable to specify whether a hardware
interrupt is to be triggered by the CM35 when the comparison value is
reached. You can use the hardware interrupt OB to evaluate which channel
has reached the comparison value.
After a counter starts, only one hardware interrupt is triggered even when the
comparison value is reached a second time.
Parameterization applies to all channels.
Table 5-6 Interrupt generation
Variable Parameter
Block
Interrupt_ 2
Generation
Upper
counting limit
Compari-
son value
Start value
Counter
start
Figure 5-7 Hardware interrupt generation (counting up)
Pulse Counter Operating Mode
Offset Data
Type
7.6 Bool
No
Hardware hardware
interrupt interrupt
Value Range
0: No hardware interrupts
1: Hardware interrupts
enabled
Counter
stop
5-9