Rockwell Automation 1785-LTx,D17856.2.1 Classic PLC-5 Programmable Controllers Users Manual - Manual (Page 36)

Chapter
3
3-1
Placing System Hardware
A well-planned layout is essential to the proper installation of your Classic
PLC-5 programmable controller system. Read this chapter for information
on placing hardware.
If you want to read about: Go to
page:
Proper environment 3Ć1
Protecting your system 3Ć4
Avoiding electrostatic damage 3Ć4
Planning your raceway layout 3Ć4
Planning your cabling 3Ć6
Grounding your system 3Ć7
Place the processor in an environment with conditions that fall within the
guidelines described in Table 3.A.
Table 3.A
Proper Environmental Conditions For Your Processor
Environmental Condition Acceptable Range
Operating temperature
0 to 60 ° C (32 to 140 ° F)
Storage temperature Ć40 to 85 ° C (Ć40 to 185 ° F)
Relative humidity 5 to 95% (without condensation)
Separate your programmable controller system from other equipment and
plant walls to allow for convection cooling. Convection cooling draws a
vertical column of air upward over the processor. This cooling air must
not exceed 60
°
C (140
°
F) at any point immediately below the processor.
If the air temperature exceeds 60
°
C, install fans that bring in filtered air or
recirculate internal air inside the enclosure, or install air-conditioning/heat-
exchanger units.
Chapter Objectives
Determining the Proper
Environment
System Design
Determined
Choosing
Communication
Transferring Discrete
and Block Data
Planning Your
System Programs
Calculating Program
Timing
Assigning Addressing
Mode, Racks,
and Groups
Choosing Hardware
Placing System
Hardware
Selecting Interrupt
Routines