Siemens Simatic S7-400

Cycle and Response Times of the S7-400
9.11 CBA response times
S7-400 Automation System, CPU Specifications
Manual, 10/2006, 6ES7498-8AA04-8BA0
9-27
Measurements for Cyclic Interconnections in an Example Configuration
To be able to estimate the achievable CBA response time better, consider the following
measurements.
The processing times on the transmitting CPU and the receiving CPU basically depend on
the sum of the input and output interconnections and the amount of data on them. The
following figure shows this relationship using two examples for transmitting 600 bytes and
9600 bytes to a varying number of interconnections:
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Figure 9-11 Processing time for sending and receiving
You can estimate the CBA response time using the information in this figure and the time
you have set for the transmission frequency.