Contents
GFK-0356Q Contents xix
HHP Memory Card (IC693ACC303)...................................................................... 11-6
HHP Modes of Operation........................................................................................ 11-6
Documentation ........................................................................................................ 11-6
IC693PIF301/400 Personal Computer Interface (PCIF) Cards ...................................... 11-7
IC655CCM590 Isolated Repeater/Converter ........................................................... 11-8
IC690ACC903 Port Isolator..................................................................................... 11-8
Chapter 12
System Design ....................................................................................................12-1
Introduction..................................................................................................................... 12-1
Step 1: Planning Your System................................................................................. 12-1
Step 2: Determining I/O Requirements ................................................................... 12-1
Additional I/O Module Selection Factors................................................................ 12-2
Step 3: Selecting Option Modules........................................................................... 12-2
Step 4: Selecting a CPU .......................................................................................... 12-4
Step 5: Selecting Baseplates.................................................................................... 12-5
Step 6: Selecting Power Supplies............................................................................ 12-6
Reducing PLC Module Count by Using Other GE Products .......................................... 12-7
Designing For Safety ...................................................................................................... 12-8
Protection From Electrical Shock............................................................................. 12-8
Fire Prevention ......................................................................................................... 12-8
Protection From Mechanical Hazards ...................................................................... 12-8
Protection From Electrical Failure ........................................................................... 12-8
Protection From Design Changes or Overrides....................................................... 12-9
Safety Documentation ........................................................................................... 12-10
Guarding Against Unauthorized Operation........................................................... 12-10
Labeling, Guarding, and Lighting Issues............................................................... 12-10
Equipment Accessibility Issues............................................................................. 12-10
Number of Modules Per Series 90-30 PLC System...................................................... 12-11
Calculating Power Supply Loading .............................................................................. 12-12
Load Requirements for Hardware Components ..................................................... 12-12
Power Supply Loading Calculation Examples ...................................................... 12-14
Scan (Sweep) Time Calculation.................................................................................... 12-15
Major Design Factors Affecting Scan Time........................................................... 12-16
Where to Find Scan Time Information................................................................... 12-16
Calculating PLC Heat Dissipation ................................................................................ 12-17
System Layout Guidelines ............................................................................................ 12-17
Benefits of a Good Layout - Safe, Reliable, and Accessible.................................. 12-17
PLC Rack Location and Clearance Requirement ................................................... 12-17
Location of Modules in the PLC Racks ................................................................. 12-18
Allowable Module Locations ................................................................................. 12-19
Series 90-30 PLC Layout Example............................................................................... 12-20
PLC Mounting Position ................................................................................................ 12-21
Recommended Upright Mounting Orientation....................................................... 12-21
Derated Horizontal Mounting Orientation ............................................................. 12-21
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