Siemens Simatic S7-1500 Manuel - Page 47

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Calculating the response time

It is necessary to differentiate between two cases when calculating the response time of the

IM 155-5 PN ST:

● Case 1: The configured update time is greater than/equal to the backplane bus cycle

time.

Then:

Response time in μs = backplane bus cycle time + configured update time

● Case 2: The configured update time is less than the backplane bus cycle time.

Then:

Response time in μs = backplane bus cycle time + (configured update time x (backplane

bus cycle time / configured update time)).

If the division backplane cycle time / configured update time does not return an integer

without remainder, an additional configured update time must be added next to the

integer in the bracket.

Example calculation Case 1: The configured update time is greater than/equal to the backplane bus

cycle time.

● Configured update time is, for example, 750 μs

● Backplane bus cycle time = 510 μs

Result of case 1

Response time of the IM 155-5 PN ST = 750 μs + 510 μs = 1260 μs

Example calculation Case 2: The configured update time is less than the backplane bus cycle time.

● Configured update time is, for example, 500 μs

● Backplane bus cycle time = 510 μs

Result of case 2

Response time of the IM 155-5 PN ST = 510 μs + (500 μs x (510 μs / 500 μs) + 500 μs) ) =

510 μs + (500 μs x 1 + 500 μs) = 510 μs + 1000 μs = 1510 μs

Establishing the PROFINET response time for typical configurations on the PROFINET IO.

A typical PROFINET IO configuration consists of an IO controller with multiple IO devices

that are connected by cable or IWLAN to the IO controller. Additional loads, such as

programming devices (PGs), HMI devices (Panels) or additional S7 stations, can be present

as data receiving stations on the PROFINET line.

You can find the measured values of the PROFINET response time for a typical

configuration in this application example

(https://support.industry.siemens.com/cs/ww/en/view/21869080).

Interface module IM 155-5 PN ST (6ES7155-5AA01-0AB0)

Manual, 11/2017, A5E03612323-AC

Response times

B.1 Response times of the ET 200MP