5.2.1 Discrete Inputs
Close Limit This data bit indicates that the actuator has reached the closed
position. The limit switch should be set slightly within the actual valve
stroke to allow for torque seating or overshoot on closing without
damaging the valve. The data bit will remain true (1) even if the
position is passed through or exceeded.
Open Limit This data bit indicates that the actuator has reached the open position.
The limit switch should be set slightly within the actual valve stroke to
allow for torque seating or overshoot on opening without damaging
the valve. The data bit will remain true (1) even if the position is
passed through or exceeded.
Actuator Moving Whenever the actuator position is changing due to the motor running
or in the case of the IQ or IQT if the output drive is moving, this bit will
be set true (1).
Running Closed Whenever the actuator motor contactor used to drive the actuator in
the closing direction is energised this bit will be true (1).
Running Open Whenever the actuator motor contactor used to drive the actuator in
the opening direction is energised this bit will be true (1).
Remote Selected This bit is true (1) when the actuator three-position Remote/Local
Stop/Local selector is in the Remote position. The selector must be in
this position for Foundation control to be permitted.
Local Stop The actuator three-position selector passes from Local to Remote or
Remote to Local through the Local Stop position. The switch can also
be placed in Local Stop. When the switch is in the Local Stop position
this bit will be true (1). Remote control of the actuator is not possible
when the selector is in this position.
Local Selected This bit is true (1) when the actuator three-position Remote/Local
Stop/Local selector is in the Local position. Remote control of the
actuator is not possible when the selector is in this position.
Not In Remote This bit is true (1) when the actuator three-position Remote/Local
Stop/Local selector is not in the Remote position. The selector will be
in either the Local or Local Stop position. Remote control of the
actuator is not possible when the selector is in this position.
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