Pre-Installation Planning; Introduction - Siemens SIMATIC TI525 Hardware And Installation Manual

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:
D
Defining the control requirements
D
Determining the number of PLCs needed
D
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.
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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Hardware and Installation User Manual
2-1
CHAPTER 2