Gate/Latch inputs

The terminal provides one digital 24 V_DC input per channel. The function of these inputs is explained in the chapter Gate/Latch (external latch).

Both inputs are type 3 inputs according to EN 61131-2, with a minimum pulse duration of t_ON > 1µs.

Digital input type 3, according to EN 61131-2	Voltage [V]	Input current [mA]
Signal voltage "0 - LOW"	-3 V ... +5 V typ.	0 mA ... 2.6 mA typ.
Signal voltage "1 - HIGH"	11 V ... 30 V typ.	typ. 2.5 mA

Gate/Latch inputs 1: — Characteristic curve - input 24 V_DCtype 3

Notice

Be aware of bouncing when using electromechanical switches and push buttons

When using electromechanical switches and push buttons, repeated closing and opening of the switch or push button can occur when the switch or push button is actuated, which is referred to as bouncing.

If the function 0x80n0:22 "Enable continuous latch extern" is active, the stored value will be overwritten several times due to bouncing. As a result, you obtain not the first-saved, but the last-saved value in the parameter 0x60n0:12 "Latch value".
If the function is deactivated, only the first opening or closing of the switch or push button is detected and saved as a value in the corresponding parameter. No other transactions are taken into account.