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 filter and the effect 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 flank is detected at an interrupt input, the corresponding XOB (e.g.
XOB 20) will be called. The code in this XOB defines 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 sufficient 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
X0
X1
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
