Siemens SINAMICS G120 CU230P-2, Руководство по эксплуатации, Страница: 147 / 346

Configuring the fieldbus
6.2 Communication via RS485
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
145
P no. Parameter name
p2026 Setting of the COV_Increment
(COV = Change of values) 0 … 4194303.000, factory setting = 0.100
COV_Increment: Value change of the "Present Value" of an object instance where
an UnConfirmedCOVNotification or ConfirmedCOVNotification should be
transferred from the server.
• p2026 [0]: COV increment of object instance "Analog Input 0"
•
p2026 [1]: COV increment of object instance "Analog Input 1"
• p2026 [2]: COV increment of object instance "Analog Input 10"
•
p2026 [3]: COV increment of object instance "Analog Input 11"
You can use these parameters to set for which value changes an
UnConfirmedCOVNotification or ConfirmedCOVNotificationresult is sent.
Therefore, 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.
p2040 Fieldbus monitoring time
0 ms … 65535000 ms, factory setting = 100 ms
Note: The factory setting for communication with BACnet is possibly too low and
must be increased. Please adapt the value to the requirements and properties of
your particular plant or system.
The reason for the factory setting of 100 ms is that the communication protocols
for USS and Modbus RTU should also be executed via the RS485 interface.
6.2.4.3 Supported services and objects
BIBBs used by the inverter
The BIBBs are a collection of one or several BACnet services The BACnet services are sub-
divided into A and B devices. An A device operates as client and B device as server.
The inverter is a server and therefore operates as B device, as "BACnet Application Specific
Controller" (B-ASC).