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A01943 alarm in siemens S120 Drive

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Cause : PB/PN clock cycle signal error when establishing bus communication comes when he bus is in the data exchange state and clock synchronous operation has been selected using the parameterizing telegram. The global control telegram for synchronization is being irregularly received.

- the master is sending an irregular global control telegram.

- the master is using another clock synchronous DP clock cycle than was transferred to the slave in the parameterizing telegram.

- check the master application and bus configuration.

- check the consistency between the clock cycle input when configuring the slave and clock cycle setting at the master.

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