EINPUT

EINPUT represents the normally-open input device in electrical symbology. This component may represent a physical input of PLC or a logical input to associate with a  RELAY device. To establish if an input is physical or logical opportune values must be programmed on the REFERENCE parameter of the property dialog. If the REFERENCE value refers to a physical resource

of the PLC then a physical input will be created. If the REFERENCE field does not refer to any physical resources then the EINPUT will be configured as logical input to associate with a RELAY device. This configuration is also called LOGICAL LINKS .

There is no limit on the EINPUT devices that can be relationed with a RELAY device.

In general, an input devices perform a logical AND between the signal supplied as input and the switch signal. For switch signal we mean  the signal that closes the switch ( logical or physical ). The output of this device will be TRUE if both the input and the switch signal are TRUE.  The output will show FALSE everytime the switch is OPEN or the input is FALSE.

See also : INPUT, NCINPUT, ENCINPUT, OUTPUT, EOUTPUT, RELAY