Network engine hardware limitations - Metasys - LIT-12011832 - General System Information - Metasys System - 12.0

Metasys System Configuration Guide
Product
Building Automation Systems > Building Automation Systems > Metasys System
Document type
Configuration Guide
Document number
LIT-12011832
Version
12.0
Revision date
2024-07-17
Product status
Active

The following table describes limitations of the Metasys system network engines.

Table 1. Network engine hardware limitations

Maximum allowed

NCE25

NAE35

NAE45

NAE45-Lite

NAE55

NAE85

OAS
Local Field Buses (FBs) 1 1 1 1 2 0 0
Remote Field Buses (RFBs) 0 3 4 0 6 or 7 16 16
Total Field Buses (Local and Remote Field Buses) 1 (1 FB + 0 RFB) 4 (1 FB + 3 RFB) 5 (1 FB + 4 RFB) 1 (1 FB + 0 RFB) 8 (2 FB + 6 RFB or 1 FB + 7 RFB) 16 RFB only 16 RFB only
MS/TP devices on FC Bus 1
Note: N2 devices follow the same rules as MS/TP devices, but performance varies based on controller mix (N2Open/Sys91/VMA).
 Per trunk device limits if all devices are Metasys family devices, such as CGMs, CVMs, FACs, FECs, VMAs, IOMs, and TEC3600s:
32 50 100 100 100 N/A N/A
Per trunk device limits if one device is a non-Metasys family device, such as a Facility Explorer device, TEC2000, or third-party device:
32 50 64 64 64 N/A N/A
Remote MS/TP devices on remote field bus 2 N/A 16 or 32 16 or 32 N/A 16 or 32 16 or 32 16 or 32
Mapped N2 points per trunk 3 2,500 2,500 2,500 N/A 2,500 N/A N/A
LonWorks devices 4 32 64 127 N/A 255 N/A N/A
Note: The LonWorks integration is only supported on NAE35s, NAE45s, and NCE25s with the Metasys Release 9.0 software or earlier. Patch updates 9.0.7 and later are not supported for these LonWorks models; they remain at Release 9.0. However, the LonWorks integration is supported for NAE55s at Releases 10.0, 10.1, 11.0, and 12.0.
LonWorks network variables 1,500 1,500 1,500 N/A 2,000 N/A N/A
Johnson Controls BACnet/IP devices and third-party BACnet/IP devices 50 5 , 6 , 7 505 , 6 , 7 505 , 6 , 7 505 , 6 , 7 2005 , 6

1,000

Note: Before 11.0, the NAE85 supported 200 devices.

200
Objects 2,500 2,500 2,500 2,500 5,000 10,000 (default) 25,000 (upgrade) 20,000
Time on battery backup 1,024 seconds N/A N/A

See SNE Series Network Engines for details about SNE Series of Network Engines and see SNC Series Network Control Engines for details about SNC Series of Network Control Engines.

1 Maximum 3 bus segments per FC Bus. Maximum 50 devices per bus segment. Bus segments on an FC bus are connected with repeaters (only). Up to two cascaded repeaters may be applied to an FC bus (to connect three bus segments).
2 The maximum device count is 32 if the bus contains all Johnson Controls devices, and 16 if the bus contains one or more non-Johnson Controls devices.
3 Performance varies based on the point mix (N2 Open/Sys91/VMA). Recommend maximum for best performance is 1,000 points.
4 Single sub-net LonWorks network; does not support routers; supports physical repeaters
5 Depends on the number of objects each BACnet device supports.
6 Johnson Controls IP controllers only work with NAEs (and site directors) at Release 9.0 or later.
7 Some sites may require manual mapping based on system architecture. They may also require system adjustments, such as BACnet communication adjustments, or firewall off.