In order to access data of Sercos devices via OPC UA, data types and lengths are transformed between Sercos and OPC UA. Table 3 shows the data types and data lengths transformation rules between Sercos and OPC UA.
Table 3 – Transformation rules between Sercos and OPC UA
|
Sercos |
OPC UA |
|
|
Extended Character Set |
1 Octet List |
String |
|
Floating-Point number |
4 Octet |
Float |
8 Octet |
Double |
|
Integer |
2 Octet |
Int16 |
4 Octet |
Int32 |
8 Octet |
Int64 |
|
Unsigned Integer or Binary Number |
1 Octet |
Byte |
2 Octet |
UInt16 |
4 Octet |
UInt32 |
8 Octet |
UInt64 |
|
Sercos Time |
8 Octet |
UtcTime |
The Sercos list data types are transformed analogue to the single data types, e.g. S-0-0017 (Data type: Integer, Data length: 4 Octed list) is transformed to an array of Int32.