# Modbus TCP dropping connections **URL:** \ **Category:** Ignition\ **Tags:** perspective, ignition81\ **Created:** [July 21, 2022, 8:51am UTC](https://forum.inductiveautomation.com/t/modbus-tcp-dropping-connections/62153 "2022-07-21T08:51:45Z")\ **Posts on this page:** 1\ **Showing post:** 14
**Author:** ![Gomez](https://avatars.discourse-cdn.com/v4/letter/g/d78d45/32.png) [@Gomez](https://forum.inductiveautomation.com/u/Gomez)\ **Post date:** [August 6, 2025, 7:16am UTC](https://forum.inductiveautomation.com/t/modbus-tcp-dropping-connections/62153/14 "2025-08-06T07:16:00Z")
Hi, try to check the OMB\_Time or set al least 1 variable with a lower scanclass than 1 second ( ie. 250 ms ) > [@Modbus TCP disconnection and no reconnection \[SOLVED\]](https://forum.inductiveautomation.com/t/modbus-tcp-disconnection-and-no-reconnection-solved/15689): > > Hi, I’m experiencing a problem with ignition v. 7.9.1 ( also recreated on 7.9.4 ) regarding a Modbus TCP connection. I’m trying to estabilish a connection between Scada and an AC500 PM590 CPU from ABB ( also tested with a PM573 ). The onboard ethernet card support something called OMB\_Time, and after looking on internet and on ignition forum, I understood that is closing the tcp connection after a while when no data ( 1000 ms ) is sent from the Scada. So i declared some variables, without using… --- _[View the full topic](https://forum.inductiveautomation.com/t/modbus-tcp-dropping-connections/62153)._