Hardware Manual for the PCD2.M5 Series│Document 26/856; Version EN 12│2014-07-24
Saia-Burgess Controls AG
User inputs and outputs
PCD2.M5_ Classic CPUs and expansion housings
3-53
3
3.17
User inputs and outputs
3.17.1 Basics
Because of the input filters and the effect of the cycle time, the digital input modules
are not suitable for immediate reaction to events or for rapid counting processes.
When a positive edge is detected at the user input, an associated XOB is called (e.g.
XOB 20). The code in this XOB defines how the unit should react to the event. The
code in the XOB called from the user input must be kept as brief as possible to allow
enough time between the interrupts to process the rest of the user program.
Many FBoxes are intended for cyclic invocation and so not suitable for use in XOBs,
or only in a limited way.
Exception: the FBoxes in the Graftec family (standard library) are well suited
3.17.2 PCD2.M5_ 24 VDC interrupt inputs
The interrupt inputs (also called user inputs) are located on the motherboard and can
be connected via a 10-pole, plug-in terminal block (X6 - terminals 30 to 39). Source
operation is always used.
Pin
Inputs
XOB called in case of
a positive edge
Direct input
query
Outputs Direct output
query
39
IX0
XOB 20
I 8100
38
IX1
XOB 21
I 8101
37
IX2
XOB 22
I 8102
36
IX3
XOB 23
I 8103
35
IX4*
34
IX5*
33
out0
O 8104
32
out1
O 8105