Rockwell Automation AADvance Controller Configuration Guide - Manual (Page 20)

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ICSTT-RM405f-EN-P
Issue 07
Configuration Guide (AADvance Controller)
Scan Times
The following scan times were taken from a test system consisting of production
modules.
Module Scan Time
T9401 Digital input module, 24V dc, 8 channel
Single
Dual
Triple 1.23ms
1.73ms
2.08ms
T9431 Analogue input module 24V dc, 8 channel
Single
Dual
Triple
1.26ms
1.91ms
2.33ms
T9451 Digital output module, 24V dc, 8 channel
Single
Dual
1.43ms
2.44ms
AADvance Workbench Sleep Period 57.2ms
Scan overhead per module 0.09ms
The tests did not measure the effect of logic complexity and communications loading.
The scan time is:
  (Number of module groups x scan time shown above) + Sleep Period + (Total
modules x scan overhead)
The scan time will vary by up to +/- 5ms (not including the effect of logic and
communications).
Throughput time is the time from input change to output action. Due to the discrete
nature of the scan, the throughput time will vary between one and two scans.
Note: The AADvance application scan time is limited to a minimum of 64ms to allow
all processes to run. Small applications will report a scan time of approximately 57 -
61ms. Large applications may have longer scan times but each scan time will be
consistent to within approximately 5ms.
An example configuration scan time:
T9431 Analogue input simplex modules x 30
T9451 Digital output simplex modules x 18
Total I/O modules
= 48
Estimated scan time = (30 x 1.23ms) + (18 x 1.43ms) + 57.2ms + (48 x 0.09ms)
= 125.1ms