Siemens SIMATIC ET 200SP - Page 179

Using the module
5.1 Using the technology module
Counting, measurement and position detection
178 Function Manual, 12/2017, A5E32009889-AG
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
interrupt
Available in counting
mode using
Available in measuring
mode using
Available in
operating
mode Position
input for "Mo-
tion Control"
technology
object
Description
Event
Type
number
Incremen-
tal or pulse
encoder
SSI abso-
lute en-
coder
Incremen-
tal or pulse
encoder
SSI abso-
lute en-
coder
New Capture
value availa-
ble
Yes Yes No No No Hardware interrupt when
current counter value or
position value is saved as
Capture value
8
Synchroniza-
tion of the
counter by an
external signal
Yes No Yes No No Hardware interrupt upon
synchronization of the
counter by signal N or DI
edge
9
Gate start Yes No Yes No No Hardware interrupt when
internal gate opens
1
Gate stop Yes No Yes No No Hardware interrupt when
internal gate closes
2
Overflow (high
counting limit
violated)
Based on
counter
value
No Based on
counter
value
No No Hardware interrupt when
counter value exceeds
high counting limit
3
Underflow
(low counting
limit violated)
Based on
counter
value
No Based on
counter
value
No No Hardware interrupt when
counter value falls below
low counting limit
4
Direction
reversal*
Based on
counter
value
Based on
position
value
Based on
counter
value
Based on
position
value
No Hardware interrupt when
counter value or position
value changes direction
10
Zero crossing Based on
counter
value
Based on
position
value
Based on
counter
value
Based on
position
value
No Hardware interrupt with
zero crossing of counter
value or position value
7