Configuring The Io Cycle Time - Siemens S7-1200 System Manual

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Communication

10.2 PROFINET

Configuring the IO cycle time

A PROFINET IO device is supplied with new data from the CPU within an "IO cycle" time

period. The update time can be separately configured for each device and determines the

time interval in which data is transmitted from the CPU to and from the device.

STEP 7 calculates the "IO cycle" update time automatically in the default setting for each

device of the PROFINET network, taking into account the volume of data to be exchanged

and the number of devices assigned to this controller. If you do not want to have the update

time calculated automatically, you can change this setting.

You specify the "IO cycle" parameters in the "Properties" configuration dialog of the

PROFINET IO device. This dialog appears near the bottom of the page whenever you have

selected any part of the instruction.

In the "Device view" of the PROFINET IO device, click the PROFINET port. In the

"PROFINET Interface" dialog, access the "IO cycle" parameters with the following menu

● "Advanced options"

● "Realtime settings"

● "IO cycle"

Define the IO cycle "Update time" with the following selections:

● To have a suitable update time calculated automatically, select "Automatic".

● To set the update yourself, select "Can be set" and enter the required update time in ms.

● To ensure consistency between the send clock and the update time, activate the "Adapt

update time when send clock changes" option. This option ensures that the update time

is not set to less than the send clock.

Table 10- 27 Configuring the ET200S PROFINET IO cycle time

ET200 S PROFINET IO device

PROFINET port

ET200S PROFINET IO cycle dialog

S7-1200 Programmable controller

System Manual, 03/2014, A5E02486680-AG