PC3 and PC2 seem OK, PC1 shows blue squares everywhere!! all projects! Of course, before my Beckhoff PLC turned off, all these ZenOn systems work well. In the case of the Beckhoff PLC is turned off (or the loss of Ethernet), PC3 : Runtime Server + TwinCat Manager configured PC2 : Web Server (without TwinCat system) PC1 : Web Client (without TwinCat system) If the first is the case, you could contact your local support to see if this is a standard behaviour of the driver, or perhaps needs to be looked at.
When the driver tries to communicate the variable for which the index group was changed, this results in an error for this station (connection).Īre you sure that all other variables are not communicating? Or do all other variables only show the red square, indicating an issue with this connection but do get the updated values, and only the value for which the index group is invalid, is no longer updated. With the variable in zenon, this index group is saved and used for communication. Regarding 2): I'm not a TwiCAT expert, but as far as I know, different areas (local, global, retain. Also, the blue squares are not a bug, they are there to indicate the connection loss to the server What I'm trying to say is, that if you get blue squares on the webclient, this is not a PLC issue, but a network connectivity issue to the webserver or from the webserver to the server.
Perhaps your webserver is running on the same PC as the TwinCAT runtime? If you see blue squares on the client, this means the client has no network communication to the server, or the webserver to the server / webclient to the webserver in case of a webserver. Regarding 1): The communication between the server and the PLC is independent from the communication between server and clients. Last edited by lephis : 23rd February 2012 at 09:35 In this case, we lose the communication with this variable, that is normal but we lose also the communication with all others variables without any change. When the declaration position of a variable is changed in the PLC program, (I mean, for example, it was declared as a local variable in a sub-function before, now it is declared as a global variable), this change will make trouble to the communication with this PLC if we don't correct anything in ZenOn projects. "Communication error when the declaration position of a variable is changed in the PLC program, if we don't correct anything in ZenOn projects." It trys to receive the information of projects but never success.Ģ. ZenOn Web Client will try to connect to the ZenOn Run-Time server without stop. Yes, I mean, not only the communication with this remote Beckhoff PLC, but all others communications (by driver 61850, driver SNMP etc.) will be lost. But a big trouble will be created at the ZenOn Web Client side : ALL communications will be lost with the blue point shown. When a remote Beckhoff PLC is turned off (or loss of connection Ethernet etc.), ZenOn Run-Time server seems OK. "Communication error for ZenOn Web Client when a Beckhoff PLC is turned off."