5.2.16 Digital (Contact) Inputs

P51	Select P51 to configure Digital 1 Input Function Digital Input 1 is a contact closure digital input. It may be operated from external switches or relays and is generally edge triggered on contact closure. The input may be used to perform a number of functions as selected from the list below. An open input is detected if the impedance between the terminals is greater than 500 ohms. A closed input is detected if the impedance between the terminals is less than 200 ohms. Digital Input 1 is optionally available in all models.
	nonE	Input not used (factory default)	Ac.AL	Close the contact to acknowledge any active alarm
	SP.SL	Setpoint select. Close the contact to select setpoint 2. Open the contact to select setpoint 1.	Loc.b	Keylock. Close the contact to lock the front panel buttons. Open the contact to unlock the front panel buttons.
	t.reS	Timer reset. Close the contact to reset a currently running timer sequence.	t.rUn	Timer run. Close the contact to start a timer sequence running.
	t.rrS	Timer run/reset. Close the contact to run a timer sequence. Open the contact to reset the timer.	t.HLd	Timer hold. Close the contact to stop the timer at its current time.
	Nan	Select manual. If the controller is in Auto, make the contact permanently to select Manual. If the controller is already in Manual, make then break the contact to return to Auto.	Sby	Standby mode. In this mode control outputs go to zero demand.

P52	Select P52 to configure Digital 2 Input Function Digital input 2 allows the same functions as listed for Digital Input 1 to be performed. Digital Input 2 is not available in 816 but it is optionally available in models 808 and 804. Digital input 2 is generally edge triggered on contact closure.
	nonE	Input not used (factory default)	Ac.AL	Close the contact to acknowledge any active alarm
	SP.SL	Setpoint select. Close the contact to select setpoint 2. Open the contact to select setpoint 1.	Loc.b	Keylock. Close the contact to lock the front panel buttons. Open the contact to unlock the front panel buttons.
	t.reS	Timer reset. Close the contact to reset a currently running timer sequence	t.rUn	Timer run. Close the contact to start a timer sequence running.
	t.rrS	Timer run/reset. Close the contact to run a timer sequence. Open the contact to reset the timer.	t.HLd	Timer hold. Close the contact to stop the timer at its current time.
	Nan	Select manual. If the controller is in Auto, make the contact permanently to select Manual. If the controller is already in Manual, make then break the contact to return to Auto.	Sby	Standby mode. In this mode control outputs go to zero demand.