---
title: "system.opcua.callMethod"
description: "Calls a method in an OPC UA server."
---

# system.opcua.callMethod

> Calls a method in an OPC UA server.

This function is used in **Python Scripting**.

## Description
Calls a method in an OPC UA server. To make the most of this function, you'll need to be familiar with methods in the [OPC UA server](../../../ignition-modules/opc-ua/opc-ua-client-connection-settings/opc-ua-client-connection-settings.md).

## Client Permission Restrictions
This scripting function has no [Client Permission](../../../ignition-modules/vision/vision-project-properties/vision-project-properties.md#vision-permissions-properties) restrictions.

## Syntax
`system.opcua.callMethod(connectionName, objectId, methodId, inputs)`

### Parameters
Type | Parameter | Description 
------- | ------- | ------
String| `connectionName` | The name of the OPC UA connection to the server that the method resides in.
String| `objectId` | The NodeId of the Object Node the Method is a member of.
String| `methodId` | The NodeId of the Method Node to call.
 List| `inputs` | A list of input values expected by the method.

### Returns
**Tuple** - A tuple containing the following:
- 0	Resulting StatusCode for the call
- 1	A list of StatusCode objects corresponding to each input argument
- 2	A list of output values.

### Scope
Gateway, Perspective Session

### The StatusCode Object

This function returns multiple StatusCode objects. StatusCode is a tuple, containing the following:

|Index Order|Description|
|--|--|
|0|	The value of the code|
|1	|The name of the code|
|2|A description of the code|

## Code Examples
```python title="Example #1"
# Call the Server object's GetMonitoredItems method.
result = system.opcua.callMethod(
        "Ignition OPC UA Server",
        "ns=0;i=2253",
        "ns=0;i=11492",
        [1]
    )
 
# Below we print the various elements in the results. The print statements could easily be replaced by something more useful.
 
# Prints the StatusCode for the call.
print result[0]
 
# Prints the list of StatusCodes, one for each input argument passed to system.opcua.callMethod.
print result[1]
 
# Prints the output values from the call.
print result[2]
```