User Manual

System configuration
Devices
22
CM110664en_07 329 | 351
Function Touch panel BACnet/IP web interface
TCP/IP BACnet/IP
PXM50-1
PXM40-1
PXM30-1
PXM50.E
PXM40.E
PXM30.E
PXG3.W100-1
PXG3.W200-1
Max. number of assigned devices
BACnet/IP
BACnet MS/TP *)
BACnet LonWorks *)
n.a.
50
10
10
50
10
10
Number of simultaneously connected operator clients
1
n.a. 5 5
Max number of devices connected to one BACnet device
n.a. 5 5
Data points per plant graphic
n.a. 40 40
Data points (in a table)
n.a. 40 40
Number of defined users
n.a. 8 8
Trend chart, max. number of entries
(Max. 5 trends, with 10,000 each)
50,000 50,000 50,000
Max. entries per online trend
2
10,000 10,000 10,000
Max. entries per BACnet trendlog object
3
5000 5000 5000
Trend export: Max. number of entries per trend
10,000 10,000 10,000
Max. alarm History entries
10,000 10,000 10,000
*) see specific MSTP and LonWorks section for more specific limitations
1
5 is the recommended number. More clients can be connected, but performance deteriorates when the same operations are
performed simultaneously. Example: Simultaneous load of the same plant graphic to 10 clients.
2
Trend data management must be configured according as part of the online trend configuration.
10,000 trend entries can be recorded from:
● 1 trend entry daily over a minimum of 25 years
● 1 trend entry every hour over a minimum of 1 year
● 1 trend entry every 15 minutes over a minimum of 3 months
3
The time to read a BACnet trendlog object depends on the number of entries and the data link.
Desigo Control Point is optimized for BACnet/IP devices which are supporting COV communication. The
objects of an assigned device will automatically be polled if the device does not support COV. Polling
causes a higher network communication load. This can decrease the overall performance of the Desigo
Control Point device, depending on the BACnet device and on the type of communication (MS/TP,
LonWorks). Such topologies must be tested individually and project specifically.
22.4.15.5 Limits for MS/TP
Use the router PXG3.L / PXG3.M with HW Index C only.
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.