User Manual

System configuration
Devices
22
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Data point integration: MS/TP devices are considerably slower than IP devices
due to the lower network speed. Reference value: Approximately 15 times
slower (depending on the project setup).
MS/TP is tested with 10 devices that support COV (e.g. DXR2).
Recommendation: Assign or integrate a maximum of 10 MS/TP devices on one
network branch. More devices and/or network complexity are permitted, but
they may result in longer and inconsistent times and degraded performance.
● Assign devices offline/online:
More than 10 devices degrade performance in ABT-SSA.
Additional network branches degrade performance in ABT-SSA.
● Device learning offline/online:
More than 10 devices takes longer.
The times are slower with additional network branches.
● Device restart (e.g., after the power returns):
More than 10 devices takes longer.
The times are slower for a restart.
The following limits and constraints must be considered if the MS/TP devices
do not support COV, i.e. only polling:
● Disable the list view core function (user profile setting in ABT Site)
● Limit to one concurrent operating client (limit your network topology)
● Set baud rate to 38400 or higher
● Only use the online trends functionality very limited
● Limit the points per graphic to 15
22.4.15.6 LonWorks limits
Use the router PXG3.L / PXG3.M with HW Index C only.
Data point integration: LonWorks devices take a lot longer than IP devices due
to the lower network speed. Reference value: Approximately 30 times longer
(depending on the project setup).
To avoid timeout problems,
● Use the workflow: Data point integration.
● Integrate at the standard user level
● Avoid the "Cache" dialog
● Create templates for individual data point selection for LON devices on IP
devices.
These templates can then be imported to the LON devices.
22.4.16 PXG3.L and PXG3.M BACnet routers
Item Limit Description
BDT (Broadcast Distribution Table) [50*] Max. number of BBMDs (BACnet Broadcast Management Devices)
in a BACnet internetwork. If a BACnet router is in its own IP
segment, it must be configured as a BBMD.
FDT (Foreign Device Table) [50*] Maximum number of foreign devices which can register with the
BACnet router.
Desigo CC in a remote IP segment counts as a foreign device.
Ethernet bit rate 10/100 Mbit/s The router supports 10/100 Mbps.