SNE network sensitivity - Metasys - LIT-12013352 - M4-SNE10500-0 - M4-SNE10501-0 - M4-SNE11000-0 - M4-SNE11001-0 - M4-SNE110L0-0 - M4-SNE110L1-0 - M4-SNE22000-0 - M4-SNE22001-0 - Supervisory Device - SNE10 Network Engine - SNE11 Network Engine - SNE22 Network Engine - SNE Supervisory Network Engine - 12.0

SNE Commissioning Guide

Brand
Metasys
Product name
SNE10 Network Engine
SNE11 Network Engine
SNE22 Network Engine
SNE Supervisory Network Engine
Document type
Commissioning Guide
Document number
LIT-12013352
Version
12.0
Revision date
2022-12-12
Product status
Active
Language
English

On some busy building networks, equipment controllers on the BACnet/IP and MS/TP field bus may cycle online and offline to the SNE, even though the device is actually online. This behavior is most often seen with small-capacity network engines. If the building network is experiencing this issue, you can lower the sensitivity of the BACnet/IP and MS/TP field bus networks by increasing the number of seconds the network engine waits before flagging an equipment controller as offline. Three different sensitivity options, each with a different set of values, are available:

  • High Sensitivity: Use for a system that is not showing any signs of the offline cycling issue.

  • Medium Sensitivity (default): Use for a system that is showing the offline cycling issue occasionally.

  • Low Sensitivity: Use for a system that is showing chronic occurrences of the offline cycling issue.

Table 1 lists the items in the network engine that you can adjust to decrease network sensitivity. After changing any of these values, you need to restart the engine for the new sensitivity settings to take effect. For a description of the steps required, see Adjusting SNE network sensitivity.

Table 1. Network Sensitivity Adjustments

Navigational Tree Item

Attributes to Adjust

Network Engine: Focus window

(See Table 1)

APDU Segment Timeout

APDU Timeout

APDU Retries

Internode Comm Timer

BACnet Protocol Eng

(See Table 2)

Poll Delay

BACnet IP

(See Table 3)

Internode Comm Timer

APDU Segment Timeout

APDU Timeout

APDU Retries

Field Bus MSTP

(See Table 4)

Internode Comm Timer

APDU Segment Timeout

APDU Timeout

APDU Retries