System Design and Layout
GFK-0356Q Chapter 12 System Design 12-15
12
Example 1: Series 90-30, Model 323 Embedded CPU (10-slot baseplate)
Component +5V +24V Isolated +24V Relay
IC693CPU323 Embedded CPU
Baseplate
430
IC693PRG300 Hand-Held Programmer 170
IC693ALG390 Analog Output 32 120
IC693ALG220 Analog Input 27 98
IC693APU300 HS Counter 190
24 VDC Input (16 points) 5 120
IC693MDL340 Input Module 5 120
IC693MDL740 Output Module 110
IC693MDL240 Input Module 90
IC693MDL310 Output Module 210
IC693MDL940 Relay Out. Mod. 7 135
IC693MDL930 Relay Out. Mod. 6 70
Totals (milliamps)
(Watts)
1281
6.41
458
10.99
205
4.92
Total Watts = 22.32
Example 2: Series 90-30, Model 351 Modular CPU (10-slot baseplate)
Component +5V +24V Isolated +24V Relay
IC693CHS391 Modular CPU Baseplate 250
IC693CPU351 CPU Module 890
IC690ACC901 Miniconverter Kit 100
IC693PCM301 PCM Module 425
IC693ALG390 Analog Output 32 120
IC693ALG220 Analog Input 27 98
IC693APU300 HS Counter 190
IC693MDL340 Input Module 5 120
IC693MDL740 Output Module 110
IC693MDL240 Input Module 90
IC693MDL310 Output Module 210
IC693MDL940 Relay Out. Mod. 7 135
Totals (milliamps)
(Watts)
2336
11.68
338
8.11
135
3.24
Total Watts = 23.03
Scan (Sweep) Time Calculation
Scan or Sweep time is the time it takes the PLC CPU to perform all of its tasks one time. Scan
time contribution is the amount of time added to the PLC scan by the software and hardware
components of the system. For systems that may be time-sensitive, this factor should be made part
of the design specification. To help avoid timing issues, the theoretical scan time should be
calculated so that appropriate solutions can be designed into the system up-front.
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