Connection problem

[vdwpsmt]

Hi,

still no succes using the ads node. The socket connection seems to be working, but then I get several timeout messages and a reconnection attempt is made. My plc is a TC2 runtime on a windows CE system. following the documentation, the "create symbols" option should be enabled on 2 places:

• plc task: not possible in my case: (Alternatively, in the I/O Idle task this is possible)
• Device image: enable ads Server + enable 'create symbols'

log messages:

Do I need to install something else on the target system (in my case windows CE)? (Twincat ADS webservice?)

Any more suggestions?

kind regards Pascal

[PLCHome]

Did you insert the static route?

[PLCHome]

I have this configuration. I did not release the device ads I think the checkbox in the TaskConfiguration is disabled because in the PLC configuration the Dynamic Symbols are switched on, it was OK for me...

[vdwpsmt]

Hi,

Problem is mainly fixed now. Static route was ok, all other settings did not seem to have any influence.

The real problem was the fact that my Twincat system manager was always active at the same time, and connected to the same target. For now, I am running Node-RED and my twincat development on the same PC. apparently things get messed up when both systems are running at the same time from the same IP?

So, the Node-red connection is working fine as long as I don't start the twincat system manager or PLC control software and connect to the same target as my Node-Red node.

I found this issue that seems related to it: https://github.com/Beckhoff/ADS/issues/30 annoying problem...

thanks for the assistance. Pascal

[PLCHome]

If I understood correctly, it is on the router on the CE PLC. I found this:

1. TwinCAT AMS Router doesn't allow multiple TCP connections from the same host. So when you use two AdsLib instances on the same host to connect to the same TwinCAT router, you will see that TwinCAT will close the first TCP connection and only respond to the newest.
2. As ADS is transmitted over a TCP connection, there is no real time guarantee.

You can set up a second IPv4 on the PC and assign to this a ADS NET ID under Twincat. But you have to disable DHCP and enter all IP addresses by hand.

[PLCHome]

readme revised