Siemens G120P Technical Manual page 58

Commissioning
6
Configuring communication
58 | 98
Siemens
Building Technologies
BACnet MS/TP
Parameter Description
p0015 Select value 110 "BACnet MSTP" during basic commissioning.
p2021 Valid BACnet addresses: 1...127
p2020 Fieldbus baud rate
● 6: 9600 bps (factory setting)
● 7: 19200 bps
● 8: 38400 bps
● 10: 76800 bps
p2024 Processing times
● [0]: 0ms ... 10000 ms, maximum processing time (APDU timeout)
Factory setting: 1000 ms
● [1...2]: No significance for BACnet
p2025 BACnet communication parameter
The device object ID (p2025[0]) must be greater than 1 in the case of firmware <
4.6.
● [0]: 0...4194303, device object instance number
Factory setting: 1
● [1]: 1...10, maximum info frames
Factory setting: 1
For optimum performance, this value should be set to 10.
● [2]: 0...99, number of APDU retries after fault telegrams
Factory setting: 3
● [3]: 1...127, maximum master address
Factory setting: 127
To optimize performance, this value should not be greater than the number of
devices on the bus (including the master).
p2026 Setting the COV increment (COV = change of values)
● Here you can define a setting for the value changes for which an
UnConfirmedCOVNotification or ConfirmedCOVNotificationresult is sent. The
factory setting 0.100 means that an UnConfirmedCOVNotification or
ConfirmedCOVNotification is sent if the value being considered (e.g. for a
control range from 0 ... 10 V) changes by an absolute value of ≥ 0.1. Of course
this only applies if previously a SubscribeCOV service was activated for the
particular object instance. You can also set the COV increment using the
object property "COVIncrement" of the particular analog input.
● 0...4194303.000
● Factory setting: 0.100
● [0]: COV increment of object instance "Analog Input 0"
● [1]: COV increment of object instance "Analog Input 1"
● [2]: COV increment of object instance "Analog Input 10"
● [3]: COV increment of object instance "Analog Input 11"
P2027 BACnet language setting
p2040 Process data monitoring time [ms]
● Setting the time to monitor the process data received. If no process data is
received within this time, an appropriate message is output
● Factory setting: 100 ms
● The factory setting for communication with BACnet is possibly too low and
must be increased. Adapt the value to the requirements and properties of your
particular plant or system.
● The setting 0 ms deactivates the monitoring function.
A5E36496664A_d
2016-03-17