N2 Binary Output/ BACnet Binary Output

Transcription

1 Object Dictionary 1 N2 Binary Output/ BACnet Binary Output Introduction Note: The Johnson Controls Binary Output object is considered a BACnet Binary Output object because it supports BACnet functionality. In addition, this object has Johnson Controls proprietary attributes. The N2 Binary Output object s attributes represent the external, visible characteristics of a binary output. As a binary output, this object can be in either an Active or Inactive state. The Polarity attribute allows for normally open relays that are Active when energized and normally closed relays that are Inactive when energized. This object integrates N2 controllers into supervisory controllers, resulting in: a consistent interface to N2 point objects for all controller types, so they appear as a homogenous set to the user interface flexibility in point mapping support for all Metasys and Facilitator controllers. Refer to Table 1 in the Controller chapter (LIT ) of the Object Dictionary. For example, this object allows you to start or stop a fan from a supervisory controller. See the American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. (ASHRAE) Standard for information on this object and the BACnet communication standard. May 1, 2002 Johnson Controls, Inc. Code No. LIT Software Release 5.1

2 2 N2 Binary Output/BACnet Binary Output Key Concepts BACnet Polarity Relationships The relationship between the Present Value of an object and the physical state of the object is determined by the Polarity attribute. Note: Table 1 describes this relationship as defined by BACnet standards. Johnson Controls Polarity is always Normal. Johnson Controls does not support changes to the Polarity attribute. Table 1: Polarity Relationships Present Value Polarity Physical State of the Hardware Input Inactive Normal Off or Inactive not running Active Normal On or Active running Inactive Reverse On or Active not running Active Reverse Off or Inactive running Physical State of the Monitored Device

3 Object Dictionary 3 Attributes Specific Attributes Table 2: Attribute Properties Attribute Name Metasys Common Attributes Table 2 lists the attributes specific to the N2 Binary Output object. The N2 Binary Output object also has the attributes of the Metasys Common object. Refer to Table 1 in the Metasys Common Object chapter (LIT ) for details. Data Type N30 Flags* M-Series Flags* N30 Default Value See Table 1 in the Metasys Common Object chapter (LIT ). BACnet Required Attributes Options/Range Event State Enumeration Normal Normal, Fault, Offnormal Object Identifier BACnet Object ID C Out of Service Boolean False False Polarity Enumeration W Normal Normal, Reverse See Normal Reverse Enu meration Sets Present Value Enumeration DNRW DNRW Inactive, Active States Text attribute identifies the enumeration set for this attribute. Status Flags Bit String False, False, False, False In Alarm, Fault, Overridden, Out of Service See BAC Status Flags * C - Configurable, D - Default Attribute, N - Value Not Required, R - Association to Reliability, W - Writable

4 4 N2 Binary Output/BACnet Binary Output Attribute Name Data Type N30 Flags* M-Series Flags* BACnet Optional Attributes N30 Default Value Acked Bit String,, Transitions 1 Options/Range To-Offnormal, To-Fault, To-Normal See BAC Event Bits Active Text 2 String W Limit: 20 characters Change of State Count 3 Long W or greater Change of Date/Time W NONE_FFFF State Time 3 Device Type String CW W Null Limit: 20 characters Elapsed Active Time 4 Long W Null Units = seconds Event Enable 1 Bit String CW W,, To-Offnormal, To-Fault, To-Normal See BAC Event Bits Event Time Stamps 1 Array NONE_FFFF BACnetArray[3] of BACnet Time Stamp Feedback Value 1 Enumeration CW W Active Inactive, Active States Text attribute identifies the enumeration set for this attribute. Inactive Text 2 String W Limit: 20 characters Minimum Off Time Minimum On Time Notification Class 1 Long Long Long CW W 0 Units = seconds CW W 0 Units = seconds CW W The BACnet Object Identifier of the Notification Class object used for routing * C - Configurable, W - Writable 1 If the object supports intrinsic reporting, these attributes are present. 2 If either Inactive Text or Active Text is present, both are present. 3 If Change of State Time, Change of State Count, or Time of State Count Reset is present, all are present. 4 If either Elapsed Active Time or Time of Active Time Reset is present, both are present.

5 Object Dictionary 5 Attribute Name Data Type N30 Flags* M-Series Flags* N30 Default Value Options/Range BACnet Optional Attributes Notify Type 1 Enumeration CW W Alarm Alarm, Event See BAC Notify Type Priority Array Array Profile Name This BACnet optional attribute is not supported. Reliability Enumeration Reliable No Fault Detected (Reliable), No Output, Open Loop, Shorted Loop, Unreliable Other See Reliability Relinquish Enumeration CNW NW Inactive, Active Default 1 States Text attribute identifies the enumeration set for this attribute. Time Delay 1 CW W 0 Units = seconds Short Time of Date/Time W NONE_FFFF Active Time Reset 4 Time of State Count Reset 3 Date/Time W NONE_FFFF Johnson Controls Proprietary Attributes Auto Restore Boolean CW W False Heavy Equip Delay Byte CW W 0 Range: Seconds HED Controller Object Reference CW W Intrinsic Alarming Boolean C False False * C - Configurable, N - Value Not Required, W - Writable 1 If the object supports intrinsic reporting, these attributes are present. 3 If Change of State Time, Change of State Count, or Time of State Count Reset is present, all are present. 4 If either Elapsed Active Time or Time of Active Time Reset is present, both are present.

6 6 N2 Binary Output/BACnet Binary Output Attribute Name Net N2 Address Net Point Address Net Point Type Data Type N30 Flags* M-Series Flags* N30 Default Value Johnson Controls Proprietary Attributes Options/Range Byte C 0 Range: Enumeration C 0 Range: Short C 0 See Network Point Type Offline Boolean False False Overridden Boolean R R False False States Text Enumeration CW W Off On See States Text in * C - Configurable, R - Association to Reliability, W - Writable 1 If the object supports intrinsic reporting, these attributes are present. 2 If either Inactive Text or Active Text is present, both are present. 3 If Change of State Time, Change of State Count, or Time of State Count Reset is present, all are present. 4 If either Elapsed Active Time or Time of Active Time Reset is present, both are present.

7 Object Dictionary 7 Attribute Definitions Table 3: Attribute Definitions Attribute Name Metasys Common Attributes Event State Object Identifier Out of Service Polarity Present Value Table 3 lists the definitions of the attributes specific to the N2 Binary Output object. Definition See Table 2 in the Metasys Common Object chapter (LIT ). BACnet Required Attributes Indicates if an active event state associated with the object. If the object supports intrinsic reporting, this attribute indicates the event state of the object. If not, the attribute is Normal. Identifies the object with a unique numeric code. Indicates the offline/online state of the connected hardware. This attribute exists for compatibility with BACnet protocol and indicates whether the physical input that the object represents is in service. When out of service, the object does not send commands to the hardware. Indicates the relationship between the physical state of the output and the logical state represented by Present Value. If the Polarity attribute is Normal, then the Active state of the Present Value attribute is also the Active or On state of the physical output as long as Out of Service is False. If the Polarity attribute is Reverse, then the Active state of the Present Value attribute is in the Inactive or Off state of the physical output as long as Out of Service is False. If Out of Service is False for a constant physical output state, a change in the Polarity attribute produces a change in Present Value. If Out of Service is, the Polarity attribute has no effect on Present Value. The Johnson Controls Polarity attribute is always Normal. Indicates the current value of the binary output. Polarity determines the relationship between Present Value and the state of the output. See Table 1. Status Flags Represents four Boolean flags that indicate the general health of an analog output. Three flags are associated with the values of other attributes of the object. The four flags are: In Alarm - In Alarm flag is False (0) if the Event State property value is Normal; otherwise, the In Alarm flag is (1). Fault - Fault flag is (1) if the Reliability attribute is not reliable; otherwise, the Fault flag is False (0). Overridden - Overridden flag is Logical 1 if the Present Value is decoupled from the hardware output, because operator intervention provided a different value or local override is active. Out of Service - Out of Service flag is if the Out of Service attribute value is ; otherwise, the Out of Service flag is False.

8 8 N2 Binary Output/BACnet Binary Output Attribute Name Acked Transitions Active Text Change of State Count Change of State Time Device Type Elapsed Active Time Event Enable Description BACnet Optional Attributes Conveys three flags that separately indicate the receipt of acknowledgements for To-Offnormal, To-Fault, and To-Normal events. Transitions to High Limit and Low Limit Event States are considered to be Offnormal events. These flags clear upon the occurrence of the corresponding event and set under any of these conditions: upon receipt of the corresponding acknowledgement upon the occurrence of the event if the corresponding flag is not set in the Event Enable attribute (meaning event notifications are not generated for this condition and, thus, no acknowledgement is expected) upon the occurrence of the event if the corresponding flag is set in the Event Enable attribute and the corresponding flag in the Ack Required attribute of the Notification Class object implicitly referenced by the Notification Class attribute of this object is not set (meaning no acknowledgement is expected) This attribute is required if the object supports intrinsic reporting. Characterizes the intended effect of the Active state of Present Value from the viewpoint of the operator. The content of this string is a local matter but is intended to represent a readable description of the Active state. For example, if the physical output is a switch contact, then the Active Text attribute is assigned a value such as Fan 1 On. If either the Active Text or the Inactive Text attribute is present, both of them are present. Represents the number of times the Present Value attribute changed state since the Change of State Count attribute was last set to zero. A change of state is any event that alters Present Value. When Out of Service is False, a change to the Polarity attribute alters Present Value and is considered a change of state. When Out of Service is, changes to Polarity do not cause changes of state. If Change of State Time, Change of State Count, or Time of State Count Reset is present, all are present. Represents the date and time at which the most recent change of state occurred. A change of state is any event that alters the Present Value attribute. When Out of Service is False, a change to the Polarity attribute alters Present Value and is considered a change of state. Changes to Polarity do not cause changes of state. If Change of State Time, Change of State Count, or Time Of State Count Reset is present, all are present. Contains a text description of the physical device connected to the binary output, usually to describe the type of sensor. Represents the accumulated number of seconds Present Value is Active since the Elapsed Active Time attribute was last set to zero. If either Elapsed Active Time or Time of Active Time Reset are present, both are present. Conveys three flags that separately enable and disable reporting of To-Offnormal, To-Fault, and To-Normal events. An unreliable condition generates a Fault event. This attribute is required if the object supports intrinsic reporting. Event Time Stamps Conveys the times of the last To-Offnormal, To-Fault, and To-Normal event notifications, respectively. Time or Date time stamps have FF in each octet. Sequence time stamps are 0 if no event notification of that type has been generated. This attribute is required if the object supports intrinsic reporting.

9 Object Dictionary 9 Attribute Name Feedback Value Inactive Text Minimum Off Time Minimum On Time Notification Class Notify Type Priority Array Description BACnet Optional Attributes Indicates the status of a feedback value from which Present Value must differ before an event generates. The amount Present Value differs from Feedback Value to generate an event is locally determined. This attribute is required if the object supports intrinsic reporting. A To-Offnormal event generates under these conditions: The Present Value differs from the Feedback Value for a minimum period of time, specified in Time Delay. The Event Enable attribute enables the To-Offnormal flag. Once equal to the Feedback Value, the Present Value must become different from the Feedback Value before a To-Normal event generates under these conditions: The Present Value remains not equal to the Feedback Value for a minimum period of time, specified by Time Delay. The Event Enable attribute enables the To-Normal flag. The feedback value can be written by a Connection object or Global Data Sharing object. Characterizes the intended effect of the Inactive state of Present Value attribute from the viewpoint of the operator. The content of this string is a local matter, but it is intended to represent a readable description of the Inactive state. For example, if the physical output is connected to a switch contact, then the Inactive Text attribute is assigned a value such as Fan 1 Off. If either the Inactive Text or Active Text attribute is present, then both are present. Represents the fewest number of seconds Present Value remains in the Inactive state after entering the Inactive state. Represents the fewest number of seconds Present Value remains in the Active state after entering the Active state. Specifies the notification class used when handling and generating event notifications for the object. This attribute implicitly refers to the Notification Class object that has a Notification Class attribute of the same value. This attribute is required if the object supports intrinsic reporting. Conveys whether the notifications generated by the object are Events or Alarms. This attribute is required if the object supports intrinsic reporting. Lists values of the object in level of importance. Reliability Indicates if the Present Value is unreliable and why. Any value defined in the Metasys Common Object (LIT ) can be written directly to this attribute. Any value written to the Reliability attribute remains until the next time the Present Value is written. Relinquish Default Indicates the default value used for Present Value when all command values in Priority Array are Null.

10 10 N2 Binary Output/BACnet Binary Output Attribute Name Time Delay Time of Active Time Reset Time of State Count Reset Auto Restore Heavy Equip Delay HED Controller Intrinsic Alarming Description BACnet Optional Attributes Specifies the minimum number of seconds that the Present Value must remain: equal to any one of the values in the Alarm Value Property before a To-Offnormal event generates different from any one of the values in the Alarm Value Property before a To-Normal event generates This attribute is required for intrinsic alarming. Represents the last date and time Elapsed Active Time set to a zero value. If either Elapsed Active Time or Time of Active Time Reset is present, both are present. Represents the date and time the Change of State Count attribute was last set to a zero value. If Change of State Time, Change of State Count, or Time of State Count Reset is present, all are present. Johnson Controls Proprietary Attributes When, the supervisory system restores the last command to the attached hardware. When False, no command is issued. Indicates the amount of time that the start of equipment is delayed. Identifies the Heavy Equipment Controller object managing the delays. Enables the definition of the intrinsic alarm related attributes. Net N2 Address Indicates the actual controller N2 Address (1-254) as defined by switch settings on the controller. Net Point Address Indicates the network point address of the specified type (1-256). Net Point Type Offline Overridden States Text Indicates the point type in the controller. Indicates whether the object is online or offline as determined by the controller s offline condition. Shows the override state of the hardware (if supported by the hardware). Indicates the displayed strings for the Present Value.

11 Object Dictionary 11 Commands The N2 Binary Output object supports the commands listed in Table 4. The order of the commands in the table reflects how the commands appear on the user interface. Table 4: Supported Commands Command Name Parameters Access Level Description State0 State1 Operate Releases Command Priorities 9 through 15 (Scheduling) and then writes to the Present Value at the Default (16) command priority. If this is the highest, it is sent to the controller. The state command names and number of commands are dependent on the States Text and Number of States attributes. Override The value to be written to the Supervise Updates the Present Value at Command Priority equal to Operator Override (8). Present Value Override Release Supervise Releases Command Priority Operator Override from Present Value. Release 1. Attribute name 2. Command priority Supervise Releases the identified command priority from the specified, writable attribute, and allows it to be controlled by the next highest priority. Release All Attribute name Supervise Releases Command Priorities 3 through 16 (Default) from the specified, writable attribute. Command Priorities 1 and 2 remain. Enable Modify Allows distribution of Changes-of-Value and commanding. Disable Modify Prevents distribution of Changes-of-Value and commanding. Note: For the Override Release, Release, and Release All commands, if all Command Priorities have been released and a Relinquish Default is not defined, the supervisory controller gives control over to the actual hardware. Controls Group 507 E. Michigan Street P.O. Box 423 Milwaukee, WI Printed in U.S.A.