Hardware Manual

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

Saia-Burgess Controls AG

System resources

CPUs and expansion housings

3

3.3 System resources

3.3.1 Program blocks

Type Number Addresses Remarks

Cyclic organization blocks

(COB)

16 0...15 Main program elements

Exception/system-dependent

organization blocks (XOB)

32 0...31 called from the system

Program blocks (PB) 300 0...299 Sub-programs

Function blocks (FB) 1000 0...999 Sub-programs with parameters

Sequential blocks (SB)

PCD1, PCD2.M110/M120/M150:

total 2000 steps and transitions

each

PCD2.M170, PCD2.M480:

total 6000 steps and transitions

each (with PG5 ≥ 1.2 and

firmware version ≥ 010)

32

96

0...

0...

for Graftec programming of

sequential processes

3.3.2 Computation ranges for count types

Type Remarks

Integers – 2,147,483,648 to

+ 2,147,483,

Format: decimal, binary, BCD or

hexadecimal

Floating point numbers – 9.22337 x 10^18 to

• 5.42101 x 10-^

• 9.22337 x 10^18 to


• 5.42101 x 10-

Instructions are provided to

convert values held in Saia

format (Motorola Fast Floating

Point, FFP) to IEEE 754 format

and vice versa.