Communication PROFIBUS DP/PROFINET IO 10.3 Communications via PROFINET IO

Setting criteria for times

Cycle (TDC)

TDC must be set to the same value for all bus nodes. TDC is a multiple of SendClock.

TDC > TCA_Valid and TDC ≧ TIO_Output

TDC is thus large enough to enable communication with all bus nodes.

NOTICE

After TDC has been changed on the PROFINET IO controller, the drive system must be switched on (POWER ON) or the parameter p0972=1 (Reset drive unit) must be set.

TIO_Input and TIO_Output

Setting the times in TIO_Input and TIO_Output to be as short as possible reduces the dead time in the position control loop.

TIO_Output > TCA_Valid + TIO_Output_MIN

Settings and optimization can be done via a tool (e.g. HW Config in SIMATIC S7).

User data integrity

User data integrity is verified in both transfer directions (IO controller <––> IO device) by a sign of life (4-bit counter).

The sign-of-life counters are incremented from 1 to 15 and then start again at 1.

IO controller sign of life

STW2.12 ... STW2.15 are used for the IO controller sign of life.

The IO controller sign-of-life counter is incremented on each IO controller application cycle (TCACF).

The number of sign-of-life errors tolerated can be set via p0925.

p0925 = 65535 deactivates sign-of-life monitoring on the IO device.

Monitoring

The IO controller sign-of-life is monitored on the IO device and any sign-of-life errors are evaluated accordingly.

The maximum number of tolerated IO controller sign-of-life errors with no history can be set via p0925.

If the number of tolerated sign-of-life errors set in p0925 is exceeded, the response is as follows:

1.A corresponding message is output.

2.The value zero is output as the IO device sign of life.

3.A new synchronization with the IO controller sign of life is started.

IO device sign of life

STW2.12 ... STW2.15 are used as IO device sign of life.

The IO device sign-of-life counter is incremented in each DC cycle (TDC).

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Drive Functions

Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4

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Efficient Networks S120 manual TDC TCAValid and TDC ≧ TIOOutput