Hardware Manual

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

Saia-Burgess Controls AG

System resources

CPUs and expansion housings

3

3.3.4 Program structure for the PCD Classic family

COB 15

COB ..

COB 0

XOB 31

XOB ..

XOB 0

PB 299

PB ..

PB 0

FB 999

FB ..

FB 0

STep

TRansition

SB 0

SB ..

SB 31

Program blocks

Sequential blocks

Cyclically organized blocks Exceptions / system-dependent blocks

Function blocks

More information on this subject can be found in TIs 26/362 (PG5) and

26/354 (Operating system)