The Internet of Things (IIoT) offers unprecedented possibilities for industries. Stay ahead with EcoStruxure™ Plant and Machine.Learn more
...with the EcoStruxure™ Facility Expert (formerly known as Facility Hero) app in hand! Discover how you can optimize your maintenance efforts today.Learn more
Access tailored services, 24/7 self-service and expert help. Anywhere, anytime, any project.Discover now
The story behind the Shedd Aquarium, a smart, sustainable facility that connects people to animals, with EcoStruxure™.Discover how
Welcome to the Schneider Electric Global Website×
Goals and Symptoms
How to restore the RS-485 communications on a 'Tesys U' connected to a Tesysport.
Facts and Changes
Causes and Fixes
If '140NOE77111 'communications to the Tesysport is recovered after a lockup, the RS-485 connection to
the 'Tesys U' does not get restored. When this happens, the ERR led on the 'Tesys U' will be flashing.
In order to re-establish the RS-485 Modbus communications to the 'Tesys U', the recovery bit (bit 3 of
word 703) must be reset.
The following is from page 58 of the 'TeSys® U LULC032-033 Modbus Communication Module
Recovery After Loss of Communication
After acknowledgment by setting bit 703.3 to 1, recovery occurs according to the states of control
bits 704.0 and 704.1.
To resolve the issue the application needs to be modified to
Sign up for all the latest solutions, offers and best practices straight to your inbox.
We are excited that you have joined the group. You will receive your welcome email soon describing the program and what to expect in the upcoming weeks. Enjoy!