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Goals and Symptoms
The purpose of this resolution is to inform users of Momentum 170LNT71000 Devicenet Communication Adapters of an issue with firmware version 1.21.
Facts and Changes
If operating for more than 30 seconds after the network becomes active, bidirectional discrete base outputs can freeze at last value when the LNT DeviceNet adapter loses fieldbus communication.
The issue will occur if a Devicenet Comm Adapter version 1.21 is mounted on a bi-directional module and both Polled and Strobed modes are selected at the same time in the Devicenet Scanner IO Parameters.
Causes and Fixes
At this time, a workaround to this problem involves selecting only POLLED mode in the Devicenet Scanner when using bi-directional modules.
Devicenet Communication Adapters that have firmware version 1.21 installed are: