Latch and Gate/Latch inputs

The terminal provides two digital 24 VDC inputs. The function of these inputs is described in the respective chapter.

Both inputs are type 3 inputs according to EN 61131-2, with a minimum pulse duration of tON > 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

Latch and Gate/Latch inputs 1:
Characteristic 24 VDC Input type 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" or 0x80n0:23 "Enable continuous latch extern 2" is active, the stored value is overwritten several times due to the bouncing. As a result, parameter 0x60n0: 12 "Latch value" or 0x60n0: 22 "Latch value 2" contains the value that was saved last, not the value that was saved first.
  • 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.