Siemens LC 500, Sitrans instruction manual Digital Signalling Mode solid-state output, = cc

Appendix A

Digital Signalling Mode (solid-state output)

Note: Menu 18 has precedence over menu 17.

Controls the solid-state switch output and allows you to set the switch to contact open or contact closed. The settings are relative to a covered probe, and the criteria are set in menu 15 and 16. With contact closed, the switch is on: with contact open the switch is off.

While a button is pressed, the LCD displays S: cc1 (contact closed) or S: co (contact open). When the button is released an equal sign (=) indicating status replaces the colon, and the reading depends on the status of the probe2.

Example: S = cc is selected (contact closed with a covered probe)

•If the probe is uncovered when the button is released, the display changes from S: cc to S = co.

•If the probe is covered when the buttons are released, the display changes to

S = cc.

•If you press either button briefly, the LCD displays the current setting, in this case, S: cc.

Menu	Affected	Rotary	Left			Des-
Item	by:	Switch	Arrow	Mode		cription	Action	Values
		Position
							Press and	Display
				Disabled	*		hold both	shows
							buttons	S: - -
						Contact	Press and	Display
17	18	7	On	Digital		Closed:	hold RED (+)	showsa
				Signal-		switch on	button	S: cc
				ling
						Contact	Press and	Display
				Mode		Open: switch	hold BLUE	showsa
						off	(–) button	S: co

a.While the button is pressed: when released the display depends on the probe status.

1.Set the rotary switch to 7.

2.Press and hold the RED (+) or BLUE (–) button to select contact open or contact closed.

or: Press and hold both buttons to disable this function.

Menu selections 13, 14, 15 and 16 set the criteria for delay and threshold that have to be met for a change in output signal.

1.A colon at the extreme left of the display appears while the button is pressed to indicate when a setting is accepted, for example : S: cc.

2.If digital fault signalling is enabled at menu 18, it takes precedence, and no equal sign will appear in the display for menu 17 if the device is responding to a fault.

Page 70 SITRANS LC 500 – INSTRUCTION MANUAL 7ML19985GE01