This object contains attributes common to many Metasys system objects. These common attributes are described in the Common Object Attributes section. This section includes attributes of the Focus/Configuration tab and the Diagnostics tab. See the Object and Feature Tabs section for information on the attributes that appear on the other tabs of this object (for example, the Hardware and Options tab appear on point objects).
|
Attribute Name |
Notes |
Values/Options/Range |
Description |
|---|---|---|---|
|
Alarm State |
Indicates the current status of the object. The expected state is Normal. |
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APDU Retries |
C,W |
Indicates the maximum number of times the device can retransmit a data frame. If the device does not perform retries, it has a value of 0. If this value is greater than 0, a non-zero value appears in the APDU Segment Timeout attribute. Recommended settings: high sensitivity: 3 (default); medium sensitivity: 4; low sensitivity: 5. Note: If you change the value of this
attribute, you must reset the network engine for the new
settings to take effect. Also, this attribute is only visible in
Snapshot Focus view.
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APDU Timeout |
C,W |
Indicates the amount of time in milliseconds between retransmissions of a complete data frame requiring acknowledgment for which no acknowledgment has been received. This attribute applies to smaller data messages where the entire message fits within a single frame on the IP network. Recommended settings: high sensitivity: 6000 ms; medium sensitivity: 12000 ms (default); low sensitivity: 20000 ms. Note: If you change the value of this
attribute, you must reset the network engine for the new
settings to take effect. Also, this attribute is only visible in
Snapshot Focus view.
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|
APDU Segment Timeout |
C,W |
Indicates the amount of time in milliseconds between retransmissions of a data frame segment requiring acknowledgment for which no acknowledgment has been received. This value is not 0 if the device supports segmentation of transmitted data frames. Recommended settings: high sensitivity: 8000 ms; medium sensitivity: 11000 ms (default); low sensitivity: 20000 ms. Note: If you change the value of this
attribute, you must reset the network engine for the new
settings to take effect. Also, this attribute is only visible in
Snapshot Focus view.
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|
Count |
Indicates the number of BACnet objects defined for this integration. |
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|
Device Discovery Range |
C,W |
Structure elements:
|
Contains the destinations for the Who-Is message sent during the device autodiscovery process. When the list is empty, the object sends a global broadcast in the form of the Who-Is. Adding entries to the list limits the scope of the Who-Is broadcast to only the networks and device instance ranges specified. Multiple entries to this list cause the object to send multiple Who-Is messages sequentially. The following are device discovery range network numbers to use (broadcast type:network numbers): Local: 0 (locked for editing) Global: 65,535 (locked for editing) Remote: 1 to 65,345 (editable) |
| Discover All as General BACnet Device | C,W |
Default is False for all engines and OAS Default is True for ODS |
Toggles the integration between pure BACnet mode and BACnet with proprietary messaging. When set to True, proprietary messaging is disabled. This may be useful for special cases where customers do not want Private Transfer messages on the BACnet/IP trunk. This attribute must be set before devices are added to the Integration. Also, if you used device discovery prior to the change, restart
the supervisory device to complete the change in the attribute
value. You can do this after the change or after you have added
devices to the integration. The default value is False.
Note: When this attribute is True, proprietary Objects,
Attributes, and Services on Johnson Controls devices (such
as FECs, FACs, and VMAs) are not available.
|
|
Internode Comm Timer |
C,W |
Controls the frequency of communication with MS/TP devices. Among other communications, this attribute defines the frequency of the heartbeat to monitored devices (monitored at a rate of two times the Internode Comm Timer). Recommended settings: high sensitivity: 30 seconds medium sensitivity: 120 seconds (default); low sensitivity: 240 seconds. Note: If you change the value of this
attribute, you must reset the network engine for the new
settings to take effect. Also, this attribute is only visible in
Snapshot Focus view.
|
|
| Page Size |
C,W |
10–65,535 Default=1,000 |
Determines how many points are discovered per page. |
|
Periodic Update |
C,W |
0–65,535 Units = seconds Default = 60 |
Specifies how frequently integrated BACnet objects update their attribute values. Every period, the BACnet IP Integration object prompts each integrated BACnet object that needs to update its attribute values. Also see the Execution Time attribute. Default=60. |
|
Poll Delay |
C,W |
Milliseconds 10–50 |
Specifies the time in milliseconds between BACnet object polls for attribute values. The polls start at the time specified in the Periodic Update attribute. As the Poll Delay increases, the overall time in the Execution Time attribute increases. It is useful to specify a Poll Delay on sites where the rate of reading the remote objects causes too high a burden on the Metasys network or third-party device. The initial value of the Poll Delay attribute is blank (zero). Recommended setting: high sensitivity: 20 seconds; medium sensitivity: 60 seconds; low sensitivity: 120 seconds. |
|
Preserve Discovered Devices |
C,W |
Default = True |
Controls the behavior when field device discovery is started. When this value is True (default), any devices which were previously discovered or already mapped remain in the list of discovered devices, without any attempt to reestablish communication with them. If this value is False, an attempt is made to reestablish communication with all devices, and devices which do not respond are not shown in the list of discovered devices. Set this value to False to rediscover devices which have been re-addressed on the network. |
|
Request Vendor ID |
C,N,W |
0–65,535 |
Specifies a Vendor ID when discovering new devices to limit the device list displayed to that specified Vendor ID. The default value of this attribute is Null (stored as zero) which allows all vendors to be discovered and displayed. The current list of Vendor IDs can be viewed at http://www.bacnet.org/VendorID/BACnet%20Vendor%20IDs.htm. Note: If you do not want to display devices already discovered
or mapped, then set Preserve Discovered Devices to
False.
|
|
Attribute Name |
Notes |
Description |
|---|---|---|
|
Duplicate Device Identifier |
Lists any duplicate BACnet Device Object Identifiers found after you perform an auto-discovery of BACnet/IP devices. The list contains the instance number of the BACnet Device Object Identifier and the network address (represented in hex notation) of each device with the same identifier instance number as another device on the network. The devices in this list are not included in the list of auto-discovered devices in the integration tree under the Engineering tab of the BACnet IP Integration object. The physical locations of BACnet/IP devices with duplicate device identifiers must be determined, and their object identifiers changed to make them unique network-wide. |
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|
Execution Timer |
Records the amount of time taken for the last periodic update of all integrated BACnet objects. You can use the value for this attribute to tune the Periodic Update attribute. If the Execution Time is greater than the Periodic Update, this indicates that the attribute values of integrated BACnet objects are constantly being updated over the network. Range: 0 to 4,294,967,295 Units = seconds |
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|
Polled Object Count |
Indicates the number of mapped BACnet objects currently being polled on a periodic basis. The polling is limited to those mapped BACnet objects currently being accessed either by a feature or by the UI. The Instance Number is typically smaller than the total Count. |