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170LNT71000 Devicenet Communication Adapter Network Communication Issue.

Published date: 19 November 2020

The purpose of this resolution is to inform users of Momentum 170LNT71000 Devicenet Communication Adapters of an issue with firmware version 1.21.

If a Devicenet Comm Adapter version 1.21 is mounted on a discrete input module such as a 170ADI35000 and is set to POLLED mode in the Devicenet Scanner IO Parameters, during normal operation the module will drop off the network for approximately 0.5 second and recover. This will occur repeatedly every 10 seconds.

This does not occur when the LNT is mounted on a bi-directional or output module.

Product Line

At this time, a workaround to this problem involves selecting STROBE instead of POLLED mode in the Devicenet Scanner for that module.

Devicenet Communication Adapters that have firmware version 1.21 installed

170LNT71000 communication adapters labeled SV 1.21.
Due to a clerical error, 170LNT71000s labeled SV 1.20 and built after October 2005 actually have version 1.21 installed. Adapters built before October 2005 are also labeled SV 1.20 but have version 1.11 installed and are not affected by this issue.

RSNetworks Scanner software can be used to verify the firmware version installed in the Devicenet Communication Adapter. This software reads the SV values in the 170LNT71000 firmware as 1. 011 (SV: 1.20) or 1. 021 (SV: 1.20 or SV: 1.21).

This issue is under investigation by Engineering and is expected to be resolved in a firmware update. An update to this Resolution will be available when new information is provided.

Legacy KB System (APS) Data: RESL180219 V1.0, Originally authored by DaDz on 10/25/2006, Last Edited by DaDz on 10/25/2006
Related ranges: Modicon Momentum

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