Schneider Electric SR2MAN01 user manual Zx Keys

			LD Language Elements
Zx Keys
Description	The navigation keys behave exactly like the I physical inputs (Discrete inputs). The
	only difference is that they do not correspond to smart relay connection terminals,
	but to the four gray buttons on the front panel.
	They are used as pushbuttons, and can only be used as contacts.
Use as a Contact
	This contact may use the direct state of the key (normally open mode) or its inverse
	state (mode normally closed), see below.
	Normally open mode:
	Symbol of the normally open contact, representing a key:
	Z-
	The normally open mode corresponds to the use of the direct state of the key. If the
	key is pressed, the corresponding input is said to be conducting.
	Normally closed mode:
	Symbol of the normally closed contact, representing a key:
	z-
	The normally closed mode corresponds to the use of the reverse state (logical
	complement of the direct state) of the key. If the key is pressed, the corresponding
	input is said to be non-conducting.
Example	Creating a switch operated by the Z1 key and Q1 output:
	Z1	Q1

Each time the Z1 key is pressed, the Q1 output changes state.

SR2MAN01 11/2007 91