# Ignition/beckhoff High Speed Communications **URL:** \ **Category:** Ignition\ **Created:** [March 2, 2020, 1:33pm UTC](https://forum.inductiveautomation.com/t/ignition-beckhoff-high-speed-communications/32729 "2020-03-02T13:33:14Z")\ **Posts on this page:** 1\ **Showing post:** 2
**Author:** ![chi](https://avatars.discourse-cdn.com/v4/letter/c/0ea827/32.png) [@chi](https://forum.inductiveautomation.com/u/chi)\ **Post date:** [March 2, 2020, 2:58pm UTC](https://forum.inductiveautomation.com/t/ignition-beckhoff-high-speed-communications/32729/2 "2020-03-02T14:58:42Z")
The Siemens FC5/FC6 blocks are used for sending and receiving custom TCP messages. They don't use a special Siemens protocol. If your co-workers have documented the protocol, you may use socket communication in scripting. There are some forum threads ([e.g. this one](http://forum.inductiveautomation.com/t/ignition-receive-tcp-msg-from-device/7902)) about this. > [@gregsachs](#): > > I’m just worried about speed. Yes, i would also be worried. But that is a general problem with your concept. With operating system timing and enthernet connections involved, it is a bad idea to rely on communication times. Make your system stable by design, e.g. by putting the tracking logic in the plc or by some kind of handshaking. --- _[View the full topic](https://forum.inductiveautomation.com/t/ignition-beckhoff-high-speed-communications/32729)._