User Manual

System configuration
Devices
22
330 | 351 CM110664en_07
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.
MS/TP telegrams [100 - 140] pkt/s
@115,200 bps
[-120] pkt/s
@76,800 bps
Max. [~4,5] KB/s
The BACnet router integrates BACnet MS/TP not as a field bus in
the network. The router operates transparently and routes all data
traffic addressed to the subnet. This is why global broadcast
telegrams negatively impact transmission performance of the
router and end devices.
Recommendation: Do not carry out time and security-critical
process controls using BACnet MS/TP.
Depends on baudrate, number of nodes and maximum number of
data frames (N max_info_frames).
BACnet/LonTalk [100 - 120] pkt/s
@78 KB/s
Max. [~4,5] KB/s
The BACnet router integrates one (1) BACnet/LonTalk network.
The router operates transparently. The same restrictions apply to
global broadcast telegrams as for MS/TP.
BACnet/IPv4 [~2500] pkt/s
Max. [~500]
KB/s
The BACnet router can route between two BACnet/IP networks.
The BACnet/IP networks have different UDP ports.
BACnet/IPv6 1 The BACnet router integrates one (1) BACnet/IPv6 network. The
router works transparent, but when connection ports for
BACnet/IPv4 and BACnet/IPv6 are used simultaneously, make sure
that no unintentional ethernet loops are created on the IT side.