SIMOVERT Master Drives Communication Board CBD

Master DrivesCBD05/20/994 Data transfer via DeviceNet4.2 Parameter area (PKW)4.2.1 Use of PKW object4.2.1.7 Rules for PKW object processing4.2.1.7 Rules for PKW object processing♦ The length of the task can be 2 words (for a GET SINGLE) or 4 words (for a SET SINGLE). The length of theresponse is always 3 words♦ The least significant byte (for words) must always be sent first, and then the most significant byte. The leastsignificant word (for double words) must always be sent first, and then the most significant word.♦ One task or one response only refers to one parameter value.♦ The slave sends a response to a parameter task only when the data is available from the base MASTER DRIVESunit. In standard operation, this takes 64 .. 150 ms depending on the MASTER DRIVES type.♦ In certain drive statuses (especially for initialization statuses), parameters are either not processed or with a longdelay. In this case, a response delay of up to 40 seconds must be expected.♦ The master may only issue a new parameter task after a response has been received regarding an issuedparameter task.♦ The master identifies the response to an issued task:• evaluation of the response ID (refer to Table 4.2)• evaluation of the parameter No. PNU• if required by evaluating the parameter value PWE.30 Siemens AG 477 759 4070 76 J AA-74SIMOVERTMASTERDRIVES Betriebsanleitung/OperatingInstructions