Method for parameterizing a process automation field device by simulating the acyclic services

A method for parametering a field device of process automation technology, wherein the field device includes an Analog-Output-block and a Digital-Output-block, and is connected with a control unit via a bus system and exchanges telegrams with the control unit in cyclic data traffic, the cyclic data traffic normally serves for reading or writing process data in the field device without address specification, the method comprising the steps of:

• implementing an acyclic data communication with the help of cyclic data communication by way of packaging address value and associated parameter value into at least one telegram of a cyclic service in the control unit;
• transmitting the one or more telegram(s) to the field device;
• ascertaining the address value and the associated parameter value from the one or more telegram(s) received in the field device;
• using the Analog-Output-block and a Digital-Output-block in the field device to mimic the acyclic write access, wherein necessary information and address of the parameter are coded in the Analog-Output-block and relevant services can be initiated by using defined control sequences via the Digital-Output-block;
• and
• writing the parameter value to a memory address specified by the address value in the field device.