Introduction.

Workshop PG5
Resources
3.1 Hardware resources
Each program is made up of functions, which allow the user to read, write, and
manipulate different kinds of resources. The resources which allow us to interact
with our environment, are called hardware resources.
3.1.1 Digital
inputs and
outputs
I / O
1 bit (0/1) of information
max. number of I/O
PCD1 32 (*64)
PCD2 64/96/128 (*265)
PCD4 512
PCD6 5120
* Only if the PCD is equipped with the input modules E160 or output modules
A460
Inputs and outputs represent signals which are going to, or coming from the
PCD. Inputs show the state of end-switches, pushbuttons, proximity detectors,
sensors, ect. With outputs you can activate valves, lamps, turn on A/C motors,
ect.
You can read and write outputs. Inputs can only be read.
Inputs and outputs are added to the PCD by placing I/0 cards into one of the
designated slots on the PCD. The start address of a slot is defined either by it's
position (PCD1/2 and 4 ) or by switches (PCD 6 ).
The following example turns the output O 64 on if the inputs number I1 and I2
are both high.
Another way to show such functions is by using boolean equations: O 64 =
I 1 * I 2
Instruction list program:
COB 0
0
STH I 1
ANH I 2
OUT O 64
ECOB
FUPLA program:
(FBox: Binary, AND 2 to 10 inputs)
© Saia-Burgess Controls Ltd. Page 3-1