Parameter - Ua_Readlist - Siemens SIMATIC S7-400 Operating Instructions Manual

Programming the OPC UA client blocks
5.8 FB235 UA_ReadList
You program the attributes to be read in a UDT "UANodeAdditionalInfo" that is referenced by
the input parameter "NodeAddInfos".
The handles required at the input parameter "NodeHdls" are read from array of the output
parameter "NodeHdls" of the "UA_NodeGetHandleList" block.
The number of nodeIDs at the input parameter "NodeIDCount" is always 1 so you need to
call the block separately for each target node.
Call interface
Figure 5-7
5.8.2

Parameter - UA_ReadList

Block parameters
The following table explains the formal parameters of the program block.
Table 5- 9 Parameters of the block UA_ReadList
Parameter Declaration
Execute IN
ConnectionHdl IN
NodeHdlCount IN
NodeHdls IN
NodeAddInfos IN
96
Call interface in FBD representation
S7 data type Range of values
BOOL 0, 1
DWORD 1 .. 5
WORD 1
ARRAY of 1
DWORD
ARRAY of See "Meaning"
UDT
Meaning
A rising edge 0 → 1 at the parameter starts
processing of the block.
Connection identifier supplied by UA_Connect
Number of elements in the target area to be
read. The number of must be 1.
Array of the handles of the target nodes (items)
of the OPC UA server. The handles are read
from array of the output parameter "NodeHdls"
of the "UA_NodeGetHandleList" block.
Specifies the attribute of the items to be read
and the index range. For information on the
structure of the UDT, see UDT754
UANodeAdditionalInfo (Page 98).
Operating Instructions, 01/2017, C79000-G8976-C427-02
CP 443-1 OPC UA