24 Rockwell Automation Publication ICSTT-RM447M-EN-P - July 2019
Chapter 2 The AADvance Safety Controller
Scan Times
The controller processing scan times listed in the table are taken from a test
system which used only production modules. The tests which were used to
measure the scan times did not measure the effects of logic complexity and
communications loading.
Table 2 - Typical Module Scan Times
1
The minimum overhead to the cycle time is a feature of the AADvance
Workb en c h .
The scan time is:
Scan time = 39.3 ms
+ Sync time
+ Total number of modules * 0.04 ms
+ Σ (Number of module groups x scan time shown above)
Where:
Sync time is a function of the total number of modules defined
according to the following table:
IMPORTANT Overall system power consumption, heat dissipation and weight can be
estimated using the values given in the heat dissipation and weight data
tables shown in this manual.
Module Scan
9402 Digital input module, 24 Vdc, 16 channel
Simplex
Dual
Tri pl e
0.924 ms
1.676 ms
2.453 ms
9432 Analogue input module 24 Vdc, 16 channel
Simplex
Dual
Tri pl e
1.170 ms
1.965 ms
2.656 ms
9451 Digital output module, 24 Vdc, 8 channel
Simplex
Dual
1.174 ms
2.202 ms
9482 Analogue output module, 24 Vdc, 8 channel
Simplex
Dual
0.981 ms
1.761 ms
Minimum cycle time overhead
1
39.3 ms
Scan overhead for each module 0.04 ms
0..10 modules 20 ms
11..20 modules 22 ms
21..30 modules 24 ms
31..40 modules 27 ms
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