Siemens LC 500, Sitrans instruction manual Miscellaneous, Appendix A

Appendix A

Miscellaneous

Output Signal Processing Test

Displays the Fault/Failure information. If operation is normal, two test displays alternate, which light up all the LCD segments in a cycle. If there is a fault or failure, an error code is displayed. See the detailed list of error codes and their meanings, page 53.

Menu	Rotary
	Switch	Left Arrow	Description
Item	Position
11	1	On	Output Signal Processing Test

Set the rotary switch to 1.

To change the state of the output signals, press and hold both buttons simultaneously: the digital mode outputs (the solid-state switch and the loop-current control in digital mode) change to their opposite state. Thus 4mA becomes 20mA and contact open becomes contact closed. This feature allows you to verify that the output signals are properly processed further on in the PLC/DCS system: if the normal state is non-alarm, changing the state should generate an alarm.

The outputs stay in the opposite state as long as both buttons are pressed.

Factory Settings

Displays whether the factory settings are still in place, or how much they have been changed, and allows you to restore the factory settings.

Menu	Rotary			LCD
Item	Switch	Left Arrow	Description	Display	Meaning
	Position
					No parameters
			Factory Settings	FAC A	changed from factory
					setting
12	2	On			Range settings altered:
				FAC P	timers and thresholds
					unchanged
				FAC ?	More parameters have
					been changed

Set the rotary switch to 2. To restore the factory settings, press both buttons simultaneously to change the LCD to ‘do it’ and hold both buttons for more than one second. When the buttons are released, the LCD displays FAC A.

Page 72 SITRANS LC 500 – INSTRUCTION MANUAL 7ML19985GE01