Issue
- I/O-modules go offline
- After adding more than 16 I/O modules, some I/O modules start going offline
- Only 16 out of 20 I/O modules comes online
Environment
TAC Vista
TAC Xenta 700 Server
TAC Xenta I/O modules
Cause
In TAC Vista 5.1.0 and earlier, the default value for Receive Timer is set to 24576 milli seconds. That is too long time if you want to keep 20 I/O-modules online (the Xenta 700 device does not answer some of the I/O-modules).
TAC Vista 5.1.1 and newer have the receive timer set to 2048 by default, though this only applies to new installations (i.e. if you upgrade it will keep the old value) .
Resolution
- Open the properties window of the Lonworks network
- Change the receive timer to 2048 ms.
- All the I/O modules should now come online. If not, lower the receive timer one step, though not less than to 768 ms.