Fieldbuses A-49
AC30 series Variable Speed Inverter
Read Record
The RDREC function block is used to read a record. The record data and MLEN input must be at least the size of the parameter being read:
• For a standard parameter either 1,2 or 4 bytes respectively
• For an array parameter the total number of bytes of all elements
• For a string parameter the maximum number of characters allowed for the string plus 1 for the null terminator
Write Record
The WRREC function block is used to write to a record. The LEN input must be equal to the size as the parameter being written to unless it is a
string parameter:
• For a standard parameter either 1,2 or 4 bytes respectively
• For an array parameter the total number of bytes of all elements
• For a string parameter LEN should be no more than the maximum number of characters allowed for the string plus 1 for the null terminator
Endian
The endian type for acyclic read and write requests of AC30 parameters is set using parameter 3135 PROFINET Acyclic Endn. This does not
apply to the cyclic I/O data which is always Big Endian.
Record Error Codes
If the inverter cannot process a parameter read or write request then the ERROR output of the function block will be set TRUE and the STATUS
output will be set to one of the following error codes:
User Specific (record length not big enough)
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