Cyclic Interrupts; Set_Cint (Set Cyclic Interrupt) - Siemens SIMATIC S7 System Manual

101BExtended instructions
8.4 Interrupts
You have the option to attach or detach an OB to an enabled event at configuration time. To
attach an OB to an event at configuration time, you must use the "HW interrupt:" drop-down
list (click on the down arrow on the right) and select an OB from the list of available
hardware-interrupt OBs. Select the appropriate OB name from this list, or select "<not
connected>" to remove the attachment.
You can also attach or detach an enabled hardware interrupt event during run time. Use the
ATTACH or DETACH program instructions during run time (multiple times if you wish) to
attach or detach an enabled interrupt event to the appropriate OB. If no OB is currently
attached (either from a "<not connected>" selection in device configuration, or as a result of
executing a DETACH instruction), the enabled hardware interrupt event is ignored.
DETACH operation
Use the DETACH instruction to detach either a particular event or all events from a particular
OB. If an EVENT is specified, then only this one event is detached from the specified
OB_NR; any other events currently attached to this OB_NR will remain attached. If no
EVENT is specified, then all events currently attached to OB_NR will be detached.
Condition codes
Table 8- 88
RET_VAL (W#16#....)
0000
0001
8090
8091
8093
8.4.2

Cyclic interrupts

8.4.2.1

SET_CINT (Set cyclic interrupt)

Table 8- 89 SET_CINT (Set cyclic interrupt instruction)
LAD / FBD
276
Condition codes
ENO
1
1
0
0
SCL
ret_val := SET_CINT(
ob_nr:=_int_in_,
cycle:=_udint_in_,
phase:=_udint_in_);
Description
No error
Nothing to Detach (DETACH only)
0 OB does not exist
OB is wrong type
Event does not exist
Description
Set the specified interrupt OB to begin cyclic execution
that interrupts the program scan.
S7-1200 Programmable controller
System Manual, 11/2011, A5E02486680-05