SBC PCD1.Room - Interrupt Inputs (Terminal Block X1)

Hardware Manual PCD1.M2110R1 │ Document 27-619 │ Version ENG 04 │ 2018-08-20
Saia-Burgess Controls AG
On-board│InterruptInputs
Inputs/Outputs (I/O)
4-8
4
4.1.6 InterruptInputs(TerminalBlockX1)
Basic principle
Duetotheinputlterandthee󰀨ectofthecycletime,thedigitalinputmodulesare
not suitable for reacting immediately to events or fast computing processes. Some
CPUs have interrupt inputs for this purpose.
Ifapositiveankisdetectedataninterruptinput,thecorrespondingXOB(e.g.
XOB20)willbecalled.ThecodeinthisXOBdeneshowtheunitshouldreactto
the event, e.g. increment a counter.
The code in XOBs, which is called by interrupt inputs, must be as short
aspossiblesothatsu󰀩cienttimeremainsbetweentheinterruptsinorder
to process the rest of the user program.
Many FBoxes are intended for cyclical calling and are not suitable for use
in XOBs, or are only suitable to a limited extent. Exception: The FBoxes
of the Graftec family (standard library) are well-suited.
PCD1 Interrupt Inputs 24 VDC
Both two interrupt inputs are located on the main circuit board and can
beconnectedthroughthe9-pinplug-inTerminalBlockX1(Terminals15
and16).Sourceoperationisalwaysused.
Int1
11 12 13 14 15 16 17 18 19
10
9 8 7 6 5 4 3 2 1
0
I2 I3 I1 I0
O0 O2 O3 O1 IO5 IO4 IO6 IO7
X0X1
U ext.
GND
IX0 IX1 AI0 AI1 -
+
-
24 V CC
0 V CC
Input signals (always source operation): H = 15...30 V
L = - 30...+ 5 V or unconnected
interrupt
inputs
Interruptassignment
Terminal Caption Interrupt Called XOB
15 IX0 Int0 XOB 20
16 IX1 Int1 XOB 21