Residential Control Systems TXB16 Manual do Proprietário descarregar pdf (Página 133)

Chapter 12 Input and Output Ports 119

• The output can be enabled/disabled upon downloading a schedule by first enabling/disabling the

output in the output port summary screen.

• The output can be automatically enabled/disabled after a power failure by setting the “Power Fail

State” to the desired state.

Power Failure Options

When power is restored after a power failure, some devices connected to the digital outputs might not

respond properly. You might want to control these outputs in a certain way to prevent improper operations.

You can do this by programming the controller to take certain actions on an output when power returns. This

is done by setting the output’s “Power Fail State” to one of the following:

• No Change

. Makes no changes to the port. This is the default setting.

• High

. When this is selected, the controller will set the output high after recovering from a power

failure. The state of the output prior to the power failure does not matter. The output remains

enabled, so it can be changed by subsequent commands.

• Low

. This is similar to the “High” command, expect the output is set low instead.

• Disabled

. The controller will disable the output. The output will remain in whatever state it powered

up in. Since the output is disabled, it will not respond to subsequent commands (except an Enable

command).

• Low/Disabled

. The controller will set the output low, and then disable it. The output will remain low

until it is enabled and changed by subsequent commands.

• High/Disabled

. The controller will set the output high, and then disable it. The output will remain

high until it is enabled and changed by subsequent commands.

Input Port Notes

Power Failure Options

When power is restored after a power failure, some digital inputs to the controller may not be in the correct

state. This might occur for a variety of reasons:

• The interfacing device may take a longer time to start up than the controller (for example, you have a

computer hooked to the inputs, and it has to reboot itself).

• The interfacing device may have been damaged.

• The interfacing device must be issued certain commands before it provides the correct output.

• The interfacing device is on a different power circuit than the controller and that circuit has not

recovered power.

If the controller were to take actions based on these inputs, undesired operations might occur. To prevent

this possibility, the controller can be programmed to automatically disable an input after recovery from a

power failure. The input’s “Power Fail State” can be set to one of the following:

• No Change

. Makes no changes to the port. This is the default setting.

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