Jazz, M91 PLCs and U90Ladder
Talk about issues related to Jazz, M91 PLCs, and the U90Ladder software
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I see in the code that for Ethernet, it returns the socket.Connected property, so it might be that the PLC closes the socket. (Maybe you have the PLC configured to automatically close idle sockets). Anyway, when Communication driver needs to communicate with the PLC again and the socket is not opened, then it will open it again. -
Hi Saragani, Thank you once again for your help, much appreciated. I have implemented your suggestions, and the system is now much more stable. I have a question regarding the PLC connection status. Currently, I’m using the property plc.PLCChannel.Connected to check if the PLC is connected. However, I’ve noticed that it sometimes switches from true to false. Is this a reliable method for determining the PLC connection status? If not, is there a better way to accurately check if the PLC is connected? If it is reliable, what actions should I take when it returns false? Should I attempt to reconnect, reinitialize, or handle it in some other way? How do I do it? Thanks. -
I mean that the PLC did not complete the previous Action file. And you need to give it a USB, not an update firmware, but an Action file with some minor function like Read All settings (TOOLS=>USB Action file Creator). In addition, try to get to PLC through the VNC and look in the Uni Apps what is wrong. If the address 192.168.1.4 is pinged, then it is probably access to the VNC. -
I've done this many times. With nothing connected except power, it boots up with a red blinking ERROR light immediately when the RUN light turns green. -
I always found that upgrading with SD card to be more reliable than USB
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