Hardware manual PCD1.M2220-C15 │ Document 27-640 – Version ENG03 │ 2020-03-25
Saia-Burgess Controls AG
Glossary
Appendix
A-8
A
A.5 Glossary
AWL
Statement list (programme code line for line)
Backup
Data backup on second data carrier.
Basic address
First numeric address of the IO module slot.
Buffer battery
Retention of the memory content and continuation of the clock
after the power supply has been switched off
Builder
Combines different work steps to load a programme if it is OK in
the PCD.
Compiler
A compiler is a program that complies the source text of a program
in a string that can be understood by the target computer.
CPU
Central Processing Unit Here the main housing with central unit
is designed for the Saia PCD
®
family.
Device
Device → controller (part of a project in the PG5
®
Project Manager).
Download
Fig. “DnLd” → Save data in PCD
Element
Here, the inputs and outputs, flag, register, counter, timer, etc. are
designed for the Saia PCD
®
family.
Flash memory
Digital, non-volatile memory. It retains its data without any current.
FRAM
Digital, ferroelectric, non-volatile memory. It retains its data with-
out any current.
IL
Instruction list (AWL programme code line for line)
Linker
After the compiler has done its work, the linker merges the indi-
vidual data for a programme.
LIO (Local Input Output)
Inputs/outputs on the CPU board (on-board).
Media
This indicates inputs/outputs, flag, register, etc. in the PCD family.
Media mapping
Media mapping is the software assignment of digital and ana-
logue I/O electronics to flags and registers using a list.
Module
Carrier cards for input/output electronics with suitable connection
technology.
Module holder
This specifies CPU, LIO or RIO devices that can hold IO modules.
Motherboard
Main board (CPU)
NT
New technology → subsequent generation of the first PCD gen
-
eration.
On-Board
Denotes as much as permanently installed “on the CPU mother-
board”.
Parse
A parser is a program which, in computer engineering, is respon-
sible for the decomposition and conversion of any input (text, e.g.
AWL) into a format useful for further processing.
PGU
Programmable Unit
PLC
Process Logic Controller
Port
Interface description
PWM
PWM stands for Pulse Width Modulation. Pulse width modulation
works with a constant pulse rate and a constant pulse amplitude,
only the pulse width is variable. Because the pulse rate is con-
stant, but the pulse width changes, the pulse duty factor changes.
With a PWM output, it is possible to output analog values without
expensive A/D converters.
RAM
Random Access Memory → digital, volatile RAM of the computer.
Retains data without a power supply.
