Scan (Sweep) Time Calculation - GE 90-30 PLC Series Installation And Hardware Manual

Example 1: Series 90-30, Model 323 Embedded CPU (10-slot baseplate)
IC693CPU323 Embedded CPU
Baseplate
IC693PRG300 Hand-Held Programmer
IC693ALG390 Analog Output
IC693ALG220 Analog Input
IC693APU300 HS Counter
24 VDC Input (16 points)
IC693MDL340 Input Module
IC693MDL740 Output Module
IC693MDL240 Input Module
IC693MDL310 Output Module
IC693MDL940 Relay Out. Mod.
IC693MDL930 Relay Out. Mod.
Example 2: Series 90-30, Model 351 Modular CPU (10-slot baseplate)
IC693CHS391 Modular CPU Baseplate 250
IC693CPU351 CPU Module
IC690ACC901 Miniconverter Kit
IC693PCM301 PCM Module
IC693ALG390 Analog Output
IC693ALG220 Analog Input
IC693APU300 HS Counter
IC693MDL340 Input Module
IC693MDL740 Output Module
IC693MDL240 Input Module
IC693MDL310 Output Module
IC693MDL940 Relay Out. Mod.

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.
GFK-0356Q Chapter 12 System Design
Component
Totals (milliamps)
(Watts)
Total Watts = 22.32
Component
Totals (milliamps)
(Watts)
Total Watts = 23.03
System Design and Layout
+5V +24V Isolated
430
170
32 120
27 98
190
5 120
5 120
110
90
210
7
6
1281 458
6.41 10.99
+5V +24V Isolated
890
100
425
32 120
27 98
190
5 120
110
90
210
7
2336 338
11.68 8.11
12
+24V Relay
135
70
205
4.92
+24V Relay
135
135
3.24
12-15