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HTTP Response — JSON Format

{
“<var1>” : { “value” : “<value1>”, “errorstatus”: “<errorstatus1>”},
“<var2>” : { “value” : “<value2>”, “errorstatus”: “<errorstatus2>”},
“<var3>” : { “value” : “<value3>”, “errorstatus”: “<errorstatus3>”},
[…]
}

JSON parameter values:

Error Status	Description
<var1>,<var2>,< var3>,…	The PLC"Programmable Logic Controller" A Programmable Logic Controller, PLC, or Programmable Controller is a digital computer used for automation of industrial processes, such as control of machinery on factory assembly lines. Used to synchronize the flow of inputs from (physical) sensors and events with the flow of outputs to actuators and events variable names
<value1>,<value2>,<value3>,...	The values of the corresponding variables above
<errorstatus1>,<errorstatus2>,<errorstatus3>,...	The error status (as described below)

Error Status:

Error status returned from the server while reading a variable informs the user about any error that has occurred on reading a particular variable.

The following error status strings can be returned by the server:

Error Status	Description
ok	Variable value read successfully
not found	The requested variable is not found in the application.

Example:

HTTP Command

GET kas/plcvariables?variables=TravelSpeed,IntegerVar,UntitledST.LocalVariable&format=json

Response

{
"MachineSpeed" : {"errorstatus" : "ok", "value" : "100.000000"},
" IntegerVar " : {"errorstatus " : "ok","value" : "20"},
“UntitledST.LocalVariable” : {"errorstatus " : "not found","value" : "”},
}

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