Improving Slow, Stalled, or Failed Auto Discovery - Metasys - LIT-1201535 - Supervisory Device - Network Engine

N1 Migration with the NIE Technical Bulletin

Product name
Network Engine
Document type
Technical Bulletin
Document number
Revision date

Use the information in Table 1 to assist in diagnosing and solving Auto Discovery problems.

Table 1. Troubleshooting a Slow, Stalled, or Failed Auto Discovery Process




The Auto Discovery process is slow, stalled, or has failed.

N1 Migration Message Timeouts are slowing the Auto Discovery process.

Increase the N1 Migration Message Timeout attribute value to 63 seconds on all person-machine interface (PMI) workstations and NIEs.

Out of sequence message handling is slowing the Auto Discovery process.

For improved performance, we strongly recommend you upgrade all NCMs to the latest version of software available.

Multiple NIE Auto Discoveries are running at the same time.

Run only one NIE Auto Discovery at a time. Wait for the current NIE Auto Discovery to finish completely before starting a new Auto Discovery.

The Import File for points does not match the database in the NCM (missing point).

Create an Import File of the current NCM database.

M-Series workstations are online while an Auto Discovery is in progress.

  • Graphics with a large file size can cause long upload times.
  • System is busy polling many objects configured with many trends or points.

Ensure that all M-Series workstations are offline while an Auto Discovery is in progress.

  • Reduce the file size of the graphics. Always reduce graphics to the smallest file size possible.
  • Perform the Auto Discovery during off-peak times, and non-critical times.

The NCM4500 continuously restarts during the startup procedure.

Too many VMA devices are configured on one NCM4500 (over 63 devices).

Install the NCM45x0 Quick Patch 12.04k. After installing the Quick Patch, increase the amount of acquired memory as documented in the Change Verification Report (CVR) for this Quick Patch. Contact your Johnson Controls representative if you need assistance.

The N1 NIE55 or NIE85 crashes during the Auto Discovery process.

The N1 NIE may crash if any of the units include a period. Units are discovered during Auto Discovery if you have an NIE at Release 6.0 or later.

  • Upgrade to to the latest Metasys release.


  • Edit the BI, BO, MSI, and MSO object units at the NCM so that periods are removed before running an Auto Discovery for NCM.

The NIE crashes shortly after discovering and mapping points.

A GIO object has been viewed by a user before the object has been initalized.

  • Upgrade to Release 5.2.11 or later.


  • Wait at least 20 minutes before you view newly discovered GIO objects. Archive your NIE before you discover another NCM.