Siemens SIMATIC ST-1500 Function Manual page 179

Using the module
5.1 Using the technology module
Lost hardware interrupt
If an event occurs which is supposed to trigger a hardware interrupt but the previous,
identical event has not yet been processed, no further hardware interrupt is triggered. The
hardware interrupt is lost. This may lead to the "Hardware interrupt lost" diagnostic interrupt,
depending on the parameter assignment.
Hardware interrupts that can be activated
Hardware Available in counting
interrupt mode using
Incremen-
tal or pulse
encoder
New Capture Yes
value availa-
ble
Synchroniza- Yes
tion of the
counter by an
external signal
Gate start Yes
Gate stop Yes
Overflow (high Based on
counting limit counter
violated) value
Underflow Based on
(low counting counter
limit violated) value
Direction Based on
reversal* counter
value
Zero crossing Based on
counter
value
178
Available in measuring
mode using
SSI abso- Incremen-
lute en- tal or pulse
coder encoder
Yes No
No Yes
No Yes
No Yes
No Based on
counter
value
No Based on
counter
value
Based on Based on
position counter
value value
Based on Based on
position counter
value value
Available in
operating
mode Position
SSI abso-
input for "Mo-
lute en-
tion Control"
coder
technology
object
No No
No No
No No
No No
No No
No No
Based on No
position
value
Based on No
position
value
Description
Hardware interrupt when
current counter value or
position value is saved as
Capture value
Hardware interrupt upon
synchronization of the
counter by signal N or DI
edge
Hardware interrupt when
internal gate opens
Hardware interrupt when
internal gate closes
Hardware interrupt when
counter value exceeds
high counting limit
Hardware interrupt when
counter value falls below
low counting limit
Hardware interrupt when
counter value or position
value changes direction
Hardware interrupt with
zero crossing of counter
value or position value
Counting, measurement and position detection
Function Manual, 12/2017, A5E32009889-AG
Event
Type
number
8
9
1
2
3
4
10
7