Chapter
1
11
Introduction
The Bulletin 1772 Mini-PLC-2/15 Programmable Controller is a digital,
electronic, solid state industrial programmable controller capable of monitoring
and controlling up to 128 I/O devices. The Controller has a Processor, a power
supply and a number of user-selected I/O Modules chosen for the number and
type of I/O devices in the user’s application. By selecting the appropriate
modules, the user can assemble a complete programmable controller system to
meet the application requirements.
The Processor and the selected I/O Modules are housed in a single I/O Chassis,
which can be mounted inside an enclosure with a working depth of 8 inches.
A programmable controller (PC) is a solid state logic control device used for
industries as diverse as petrochemical, food processing, pulp and paper, mining,
steel and metals, and cement to name a few.
As the term “programmable” implies, PC memory can be readily changed to
meet application needs.
The Controller continuously monitors the status of devices connected as inputs.
Based on input device status and the User Program, the Controller controls the
devices connected as outputs. These input and output devices may be of
different types with various voltage and current ranges. They may include:
limit, float, selector, and pressure switches
pushbutton
switches
thumbwheel
switches
alarms, indicators, and annunciator panels
solenoids
motors and motor starters
transducers
various solid state devices, including TTL and Analog instrumentation
General
PC Definition
Fundamental Concepts
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