CPU Specifications
and Operation
4–2
CPU Specifications and Operation
Introduction
The Central Processing Unit (CPU) is the heart of the Micro PLC. Almost all PLC
operations are controlled by the CPU, so it is important that it is set up correctly. This
chapter provides the information needed to understand:
S Steps required to set up the CPU
S Operation of ladder programs
S Organization of Variable Memory
Output CircuitInput Circuit
CPU
2 Comm.
Ports
Main
Power
Supply
To Programming Device
or Operator Interface
8 Discrete Inputs Commons Commons
6 Discrete Outputs
Power
Input
PLC
DL05
NOTE: The High-Speed I/O function (HSIO) consists of dedicated but configurable
hardware in the DL05. It is not considered part of the CPU, because it does not
execute the ladder program. For more on HSIO operation, see Chapter 3.
The DL05 Micro PLC which has 6K words of memory comprised of 2.0K of ladder
memory and 4K words of V-memory (data registers). Program storage is in the
FLASH memory which is a part of the CPU board in the PLC. In addition, there is
RAM with the CPU which will store system parameters, V-memory, and other data
which is not in the application program. The RAM is backed up by a
“super-capacitor”, storing the data for several hours in the event of a power outage.
The capacitor automatically charges during powered operation of the PLC.
The DL05 supports fixed I/O which includes eight discrete input points and six output
points. No provision for expansion beyond these fourteen I/O points is available in
the DL05 model PLCs.
Over 120 different instructions are available for program development as well as
extensive internal diagnostics that can be monitored from the application program or
from an operator interface. Chapters 5, 6, and 7 provide detailed descriptions of the
instructions.
The DL05 provides two built-in RS232C communication ports, so you can easily
connect a handheld programmer, operator interface, or a personal computer without
needing any additional hardware.
DL05
CPU Features
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