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Method for synchronizing a cycle master node to a cycle slave node using synchronization information from an external network or sub-network which is supplied to the cycle slave node

  • US 6,128,318 A
  • Filed: 01/23/1998
  • Issued: 10/03/2000
  • Est. Priority Date: 01/23/1998
  • Status: Expired due to Term
First Claim
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1. A method for synchronizing a cycle master node to a cycle slave node, including the steps of:

  • utilizing logic circuitry in the cycle slave node to determine a timer offset value, in response to the cycle slave node receiving synchronization information including a cycle reset signal, wherein determining the timer offset value includes calculating a number of clock cycles that have elapsed between a first time at which the cycle reset signal was detected and a second time at which the value was read out of the cycle slave node cycle timer; and

    , and subtracting the result of the above calculating step from the value read out of the cycle slave node cycle timer, whereby the result of the subtracting step constitutes the timer offset value;

    transmitting the timer offset value to the cycle master node; and

    ,utilizing logic circuitry in the cycle master node to adjust a value of a cycle master node cycle timer on the basis of the timer offset value.

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