Hardware Manual

Hardware Manual PCD 1 / PCD 2 Series│Document 26 / 737│Edition EN 15│2008-07-22

Saia-Burgess Controls AG

Interrupt inputs

CPUs and expansion housings

3

3.19.3 PCD2.M120/M150/M170

The two interrupt inputs are located on the motherboard and can be connected via

the 10-pole, plug-in terminal block (terminals 0 to 9). Either source or sink operation

may be used.

Function in source and sink operation:

When a positive edge is detected at input INB1, XOB 20 is called; a positive edge at

input INB2 causes XOB 25 to be called. The reaction time up to the XOB 20/25 call is

a maximum of 1 ms. The code in these XOBs defines how the unit should react to the

event, e.g. by incrementing a counter (input frequency max. 1 kHz where pulse/pause

each 50 %, total of the two frequencies max. 1 kHz).If the relevant XOB is not pro-

grammed, the ERROR LED is switched on or XOB 0 is called.

4 k 7

10 k

4 k 7

μC

68340 INA 2

INB 1

L

INB 2

0 1 2 3 4 5 6 7 8

INA 1

9

OUT^1

OUT^2

PGND

Input signals (source operation): PGND

H = 15.. 30 V

L = -30.. + 5 V or no connected

Input signals (sink operation):

H = 15 .. 30 V or no connected

L = -30.. + 5 V

source operation

(for sink operation

L at +24 V)

3.3 nF

The INA1, INA2, OUT1, OUT2 and + connections are intended for future

enhancements and must not be used.

3.19.4 PCD2.M480

The four interrupt inputs are located on the motherboard and can be connected via

the 10-pole, plug-in terminal block (terminals 0 to 9). Either source or sink operation

may be used.

Function in source and sink operation:

Each interrupt input is mapped to an XOB that will be called when there is a positive

edge at the input. The code in these XOBs defines how the unit should react to the

event, e.g. by incrementing a counter (input frequency max.

1 kHz where pulse/pause each 50 %). The reaction time up to the XOB 20...23 call isthe XOB 20 ... 23 call is

a maximum of 1 ms.

If the relevant XOBs are not programmed, the interrupt inputs can be used in the user

program like normal inputs from address 8100 upwards.