Operating Instructions

Commissioning
Configuring communication
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118
Siemens
A5E36496664A_f
Smart Infrastructure 2021-10-11
Parameter Description
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: 10000 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.
The configuration workload can be
reduced by leaving out values which are not
required. In this case, the appropriate parameters must be set manually. For more
information, refer to table "Fieldbus control word".