Primitive Value object types
Date | Single Date Value | This object type represents a certain single date information (day, month, year-1900, weekday). |
DateP | Date Pattern Value | This object type represents a date pattern. The pattern value 255 can be used as a wildcard. |
DateTime | Date and Time Value | This object type represents a combination of a specific date and time. |
DateTimeP | Date and Time Pattern Value | This object type represents a combination of date and time patterns. |
INT | Signed Integer Value | This object type represents a signed integer value. |
LAV | Large Analog Value (LREAL) | This object type represents a large analog value (8 BYTE LREAL). |
String | Character String Value | This object type represents string information. |
Time | Time Value | This object type represents a specific time (hour, minute, second, hundredths of a second). |
TimeP | Time Pattern Value | This object type represents a time value that supports patterns. |
UINT | Unsigned Integer Value | This object type represents a positive integer value (UNSIGNED). |
Some function block names contain a suffix:
_IO: These FBs are intended for connection to hardware terminal channels. The required AT%I* and AT%Q* variables are specified in the FB implementation.
E.g. a BinaryOutput_IO provides these variables to connect to terminal channels:
bRawOvrrd AT %I* : BOOL; // Raw overridden (Optional)
bRawValFdbk AT %I* : BOOL; // Raw feedback Value (Optional)
bRawVal AT %Q* : BOOL; // Raw value
_ECAT: These FBs are intended for connection to EtherCAT hardware terminal channels. The difference to the FBs with the suffix _IO is the variable nRawState, which is used to determine the Underrange/Overrange state.
_Raw: If the PLC provides the value for the BACnet object, the raw value and the raw state can be provided by the PLC program.
Example: FB_BACnet_AI_Raw:
nRawState : USINT; // Raw state
// - Underrange: 0x01
// - Overrange: 0x02
// - Error: 0x04
nRawVal : INT; // Raw value
_Disp: These function blocks refer to value object types that represent read-only values such as the current room temperature. Present_Value is not writable.
_Event: These function blocks refer to a value object similar to the type _Disp (read-only). In addition, these function blocks support Event Reporting. Present_Value is not writable.
_Setp: These function blocks refer to setpoints. Setpoints are writable BACnet objects without command prioritization ("last writer wins"). Present_Value is writable, but not commandable.
_Buf: These function blocks implement a log buffer in the PLC. This can be used for local visualizations of trend log or event log information.
_5P: These function blocks refer to commandable output or value objects that provide a set of 5 priorities for command prioritization. The priority level of each of the 5 priorities can be set in the global BACnet_Param settings.
Default settings:
Priority category | Default value |
|---|---|
Life-Safety | 1 |
Critical Equipment Control | 5 |
Minimum on/off times | 6 (defined by the BACnet standard, cannot be changed) |
Manual Local Operator | 7 (local visualization) |
Manual operator | 8 (BMS) |
Program (PLC) | 15 |
_IO5P: Same as _5P, but used for connection to hardware terminals.
_Raw5P: Same as _5P, but the process value is provided by the PLC.
_Ref: (Loop object type) These function blocks refer to loop objects that support external analog objects for the setpoint, manipulated variable and feedback value. See chapter Control loops.