Area Address (IEC) Permissible data types OPC UA data type
Bit memory MWx WORD, CHAR,
INT
UInt32
Int32
Bit memory MDx DWORD,
DINT,
REAL
UInt32
Int32
Double
Counters Cx - Byte
timers Tx - UInt32
Notes regarding the table:
● In the table, "x" stands for the byte offset in the area; "y" for the bit number in the byte; and
"z" for the data block.
● The bold data type is the default data type in each case and does not have to be specified
when addressing. In addition, the specifications DB2.DBB5.BYTE and DB2.DBB5 are
equivalent, for example.
● Square brackets are used to access arrays, e.g. "/Plc/DB5.DBW2:[10]" (word array of length
10).
Examples of variable paths (PLC access operations)
Table 4-4 Examples of variable paths (PLC access operations)
Variable path Description
/Plc/M5.0 Memory bit 0 at byte offset 5
/Plc/DB5.DBW2 Word (16-bit) at byte offset 2 in data block 5
/Random/Plc/
DB8.DBB2:STRING
UTF8 string beginning at byte offset 2 in data block 8
/Plc/DB8.DBW2:[10] Array of 10 words beginning at byte offset 2 in data block 8
/Plc/DB100.DBB1 Byte at byte offset 1 in data block 100
/Random/Plc/
DB2.DBD0:REAL[10]
Array of 10 double words (32-bit) beginning at byte offset 0 in data block
2, which are formatted as a floating-point number
OPC UA Data Access - functional scope
4.3 Variable paths
SINUMERIK Integrate for Engineering Access MyMachine / OPC UA
Commissioning Manual, 10/2015, 6FC5397-3DP40-5BA3 31
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