ADSCLOSE
The ADSCLOSE function block can be used to close explicitly an IP connection that is no longer required. The number of IP connections that may be open simultaneously is restricted to four, in order to maintain the use of resources at a minimum. A connection is automatically established when ADSREADEX, ADSWRITE or ADSRDWRTEX are called. Unused connections are automatically closed after 10 seconds. If it is necessary to establish a connection to more than four ADS devices during that period, the connections that are not required must first be closed.
VAR_INPUT
VAR_INPUT
NETID : T_AmsNetId;
CLOSE : BOOL;
TMOUT : TIME;
END_VAR
NETID: the AMS network ID of the ADS device whose connection is to be disconnected.
CLOSE : the ADS command is triggered by a rising edge at this input.
TMOUT : states the time that may not be exceeded by execution of the ADS command.
VAR_OUTPUT
VAR_OUTPUT
BUSY : BOOL;
ERR : BOOL;
ERRID : UDINT;
END_VAR
BUSY : if the function block is activated, this output is set. It remains set until feedback is received.
ERR : if an ADS error should occur during the transfer of the command, then this output is set once the BUSY output is reset.
ERRID: supplies the ADS error number or the device-specific error number when the ERR output is set.
Sample of calling the function block in FBD:
PROGRAM MAIN
VAR
fbAdsClose : ADSCLOSE;
bClose : BOOL;
bBusy : BOOL;
bError : BOOL;
nErrId : UDINT;
END_VAR
In this sample, a rising edge at the bClose input triggers closure of the IP connection to the ADS device with network address '172.16.2.209.1.1'.
Requirements
|
Development environment |
Target platform |
PLC libraries to include |
|---|---|---|
|
TwinCAT v2.7.0 & TwinCAT v2.8 |
BC9xxx (165) firmware version >= 0xB6 |
TcAdsBC.Lb6 |