2-1
Hardware
and Installation User Manual
CHAPTER 2
PRE-INSTALLATION
PLANNING
This chapter presents recommended installation practices and procedures.
Since
no two applications are identical, these recommendations are guidelines.
2.1 INTRODUCTION
Preparing the site for installation of your TI525/TI535 PLC consists of the
following:
Defining
the control requirements
Determining the number of PLCs needed
Determining the panel and grounding layout
You
should define
the control requirements in terms of the number and type of
inputs and outputs. Once the inputs and outputs have been defined, calculate
the number of I/O modules and bases that are needed. When the number of
PLCs,
bases, and I/O modules is known, determine the power requirements and
mounting space needed. Space in the base assembly may be a limiting factor
that you should consider as you plan your system. This is particularly true if
several
double-wide modules are needed.
It is useful to calculate a power budget for each base prior to installation. The
power requirements of all modules must be included in the calculations — the
PLC,
the base controllers, as well as the I/O modules. The user
-supplied power
to
individual modules is not a part of the power budget calculation.
To
help ensure reliable system operation, the total power required for the PLC,
the I/O controllers, and the I/O modules must not exceed the total power
available
from the system power supply
.
WARNING
Control
devices can fail in an unsafe condition. This
means
that, unless proper safeguards are incorporated by the
user,
certain malfunctions
of these devices could lead to a
sudden equipment startup. Such a startup could result in
property damage and/or severe physical injury to the
equipment operator.
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