Attributes (Equipment Interlock) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 15.0

Controller Tool Help

Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
15.0
Revision date
2022-11-18

The following table describes the attributes used by the Equipment Interlock modules:

Table 1. Equipment Interlock Attributes

Name

Type 1

Description

Default Value

Alarm

 

This output displays Normal when the device is available and Alarm when the device is not available.

Note: Make sure that this attribute is BACnet Exposed to ensure that the Alarm status is mapped to the engine.

Normal

Set Name: Normal/Alarm

Check Command On Mismatch

 

When true, this module identifies a mismatch between command and status when the command input is on.

When false, the module identifies a mismatch between command and status when the command input is either on or off.

The module starts immediately when this property changes.

True

Command

 

This input monitors the requested command to the controlled device.

Off

Set Name: Off/On

Device Enable

G

This output displays True when the device is available and False when the device is not available.

False

Device Status

 

This input monitors the status of the controlled device.

Off

Set Name: Off/On

Lost Status Delay

 

This input is similar to the Output Delay, but it is used after the device was commanded on, status was confirmed, but later did not match. This input may be set to a longer time than the output delay to allow a chiller to recover from low load recycle without disabling the chiller. For Pumps and towers, this time delay should be the same and the Output Delay.

30.0 Seconds

Maintenance Switch

 

This input provides a Binary Input to disable or enable the controlled device.

Enable

Set Name: Disable/Enable

Off On

 

This output displays either the Command or Device Status value as determined by the Setup input.

Default Value: Off

Set Name: Off/On

Output Delay

 

The maximum amount of time the status and command may mismatch before the device is disabled. This time is used when a device is turning on or a device is turning off; it is not used for lost status (the device was commanded on, status matched, but later did not match).

30.0 Seconds

Reset

 

This input provides a Boolean value that resets the Device Enable output to True when this value is set to True.

Note: When Setup is set to Automatic Restart, the Reset input zeros out the Retry Counter any time the Reset input is set to Reset.

Off

Set Name: Off/Reset

Retry Attempts

 

This property indicates the retry limit. When the Retry Counter is greater than or equal to the Retry Attempts, the module does not allow any more retries until the Reset input is set.

3

Minimum Value: 1

Retry Counter

 

This property indicates the count of the number of times the device has lost status.

 

Retry Interval

 

This property indicates the period of time the module waits before attempting to use the device again.

1 minute

Minimum Value: 0.3 minutes

Setup

 

This input selects the mode of operation.

Note: When Setup is set to Automatic Restart, the Reset input resets the Retry Counter to 0 whenever the Reset input is set to Reset.

None

Set Name: None/Status

Usage

 

This output value indicates the availability of the controlled device. When On, the Command to the device is currently on. When Available, the device is off and can be commanded on. When Unavailable, the device is off and cannot be used. It could be unavailable because the maintenance switch is Disabled or the Device Status did not match the Command after the Output Delay time.

Unavailable

Set Name: Usage

1 B - BACnet Exposed Parameter, C - Configuration Mode Only, G - Default Element (Generated State, if applicable), SC - Simulation and Commissioning Modes Only, V - Calculated Value (Outputs)