IEC60870_SEND_C_RD_NA_1¶
| Parameter | Value |
|---|---|
| Library_File_Name | IEC60870_AC500_V20.lib |
| Firmware | V2.6 |
| Type | Type_Function_Block_History |
| Group | Sytem Information |
The read command C_RD_NA_1 is used to request data from a monitoring station.
Only monitored data can be requested.
The monitored station will answer a read command with a send of a monitored data type and the send reason being “requested”.
The data that will be send is the last value provided to the protocol with either an active send request, or an inactive send (no send reason active on execution of send Function Block).
Any data send by normal active sends can be used on the same data point as requested. To detect the requested data, the send reason must be checked. See also background scan or interrogation.