Siemens SIMATIC PCS 7 CPU 410-5H System Manual page 316

Supplementary information
15.15 Cycle and response times of the CPU 410-5H
Calculating the longest response time
● Longest response time
● Delay of inputs and outputs
– The maximum input delay of the digital input module SM 421; DI 32×DC 24 V is
– The output delay of the digital output module SM 422; DO 16×DC 24 V/2A is
– An interference frequency suppression of 50 Hz was assigned for the analog input
– Analog output module SM 432; AO 8×13Bit was assigned for measuring range
● All components are installed in the central controller, so DP cycle times can be ignored.
● Case 1: The system sets an output channel of the digital output module after a digital
input signal is read in. The result is as follows:
Response time = 45 ms + 4.8 ms = 49.8 ms.
● Case 2: The system reads in and outputs an analog value. The result is as follows:
Response time = 45 ms + 200 ms + 2.5 ms = 247.5 ms.
316
22.5 ms * 2 = 45 ms.
4.8 ms per channel
negligible.
module SM 431; AI 8×13Bit. The result is a conversion time of 25 ms per channel. As
8 channels are active, a cycle time of the analog input module of 200 ms results.
0 ... 10 V. This results in a conversion time of 0.3 ms per channel. Since 8 channels
are active, the result is a cycle time of 2.4 ms. The transient time for a resistive load of
0.1 ms must be added to this. The result is an analog output response time of 2.5 ms.
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB