Configure PD4SD instructions

Number of states

. Select the number of states for the device.

In Override, bypass interlocks and permissives that can be bypassed.

Select to bypass the bypassable interlocks and permissives when the Override command source is selected. Clear this check box to bypass the bypassable interlocks and permissives only when maintenance bypasses them by command.

Operator command resets fault.

Select to have a new operator command also issue a Reset to the instruction when a shed fault has been latched or a Device fault is active. Clear this check box to require a separate Reset command.

External command resets fault.

Select to have a new external command also issue a Reset to the instruction when a shed fault has been latched or a Device fault is active. Clear this check box to require a separate Reset command.

Operator State 0 command always available.

Enable priority for an operator command to state 0, accepted at any time. If an operator commands the device to state 0 when a command source other than

Operator

or

Maintenance

is selected, a Reset is required to command the device. Clear this check box to make an operator command to state 0 available only when the command source is set to

Operator

or

Maintenance

.

External State 0 command always available.

Enable priority for an external command to state 0, accepted at any time. If an external command sets the device to state 0 when a command source other than External is selected, a Reset is required to command the device. Clear this check box to make an External command to state 0 available only when the command source is set to External.

Shed triggers.

Select the

Shed trigger

check boxes to configure the instruction to attempt to shed the device on the various conditions. Each condition sets a shed latch that requires a reset to clear before the device can be moved. Clear the check boxes to configure the various conditions to raise an alarm only. You cannot clear the Interlock Not OK condition. An Interlock Not OK condition always sheds the device.

Interlock/Shed action

. Select the action to take on interlock or shed fault: Hold the current state or drive the device to state 0.

Audible on.

Select whether to sound the audible signal only when the state changes from state 0, or to sound on any state change.

Powerup state.

Select the power-up state for the instruction.