| FB-Name | UA_MonitoredItemOperate |
| This Function Block is designed to be optionally called to check and modify monitored item parameters. |
| VAR_INPUT |
| B | Execute | BOOL | On rising edge node information will be read. |
| B | MonitoredItemHdl | DWORD | Monitored item handle. |
| B | Timeout | TIME | Time to response. |
| VAR_OUTPUT |
| B | ValueChanged | BOOL | Indicates that the value of the monitored item has been changed. |
| B | TimeStamp | DT | TimeStamp |
| B | RemainingValueCount | UINT | Number of remaining value changes available for processing
This parameter is for diagnostic purpose and relates to the que size: High numbers indicate that the system is overloaded and should result in reducing the sample rate to faster process incoming MonitoredItems. |
| B | Done | BOOL | FB has completed its task. |
| B | Busy | BOOL | The FB is not finished and new output values are to be expected. |
| B | Error | BOOL | Signals that an error has occurred within the FB. |
| B | ErrorID | DWORD | Error code. |
| VAR_IN_OUT |
| B | MonitoringSettings | STRUCT | See 9.1 UAMonitoredSettings (phased out structured data types) |
| Notes: - |
