system.opc.getServerState
This function is used in Python Scripting.
Description​
Retrieves the current state of the given OPC server connection. If the given server is not found, the return value will be None. Otherwise, the return value will be one of these strings:
- UNKNOWN
- FAULTED
- CONNECTING
- CLOSED
- CONNECTED
- DISABLED
Client Permission Restrictions​
This scripting function has no Client Permission restrictions.
Syntax​
system.opc.getServerState(opcServer)
Parameters​
| Type | Parameter | Description |
|---|---|---|
| String | opcServer | The name of an OPC server connection. |
Returns​
String - A string representing the current state of the connection, or None if the connection doesn't exist.
Scope​
Gateway, Vision Client, Perspective Session
Code Examples​
Code Snippet
# The following will check the state of all configured servers, and show them in a message box.
# This code interacts in the client scope, so it should be placed on a component, such as a Button.
# Retrieve a list of all servers in the gateway
allServers = system.opc.getServers()
# Initialize a message. The example will append the state of each server to this message.
# The "\n" at the end of the string adds a new line
message = "Server State:\n"
# Iterate through each server.
for server in allServers:
# for each server, append the server name, a colon, the state of the server, and a new line
message += server + ": " + system.opc.getServerState(server) + "\n"
# Show the state of the servers in a message box.
system.gui.messageBox(message)