Opc_Ua_Servermethodpost - Siemens SIMATIC ET 200AL System Manual

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Assignment of data types (SIMATIC – OPC UA)

For the input and output parameters of methods, please note the explanations regarding the

rules on usable data types in the section "Mapping of data types" (Using OPC UA

companion specifications (Page 203)).

Supply of structured data types with nested arrays

If a structured data type (Struct/UDT) contains an array, the OPC UA server does not

provide information about the length of this array.

If you use such a structure as the input or output parameter of a server method, for example,

you must ensure that the nested array is supplied with the correct length when the method is

If you do not adhere to this rule, the method fails with the error code "BadInvalidArgument".

OPC_UA_ServerMethodPost

Introduction

This section describes the instruction "OPC_UA_ServerMethodPost".

Because the instructions "OPC_UA_ServerMethodPre" and "OPC_UA_ServerMethodPost"

always have to be called up in pairs in the user program, please also take into account the

section on the instruction "OPC_UA_ServerMethodPre".

Function of the instruction

You use the "OPC_UA_ServerMethodPost" instruction to inform the operating system that

the server method was executed and that the values of the output parameter are valid.

Communication

Function Manual, 12/2017, A5E03735815-AF

OPC UA communication

9.3 Using the S7-1500 as an OPC UA server

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