Siemens SIMATIC PCS 7 Configuration page 53

3 Configuring the redundant peripherals
3.6 Additional parameter settings for the configuration of the redundant AI modules
To obtain the update time of the (partial) process image (TPA), in the first step,
the assigned (partial) process image of the AI module in question must be found,
as shown in this picture.
Figure 3–2
In the second step, the cycle time is determined in the properties of the CPU.
In this example, the update time of the (partial) process image (TPA) is 500ms
for the used TPA 3
Figure 3–3
Calculation of total deviation time:
Time
deviation
Configuration of Redundant I/O Modules
Entry-ID: 28430682, V2.0,
= 2 * (time + time
module
03/2015
)
TPA
53