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Controllers
6.2 Drive functions
AT40, ATD400V, ATD400K, ATD4xxW, ATD400S, ATE250S, ATD400T
System Manual, 06/2016, A2B00096162-AN
39
6.2.2
Light barrier
Description of function
The input for the light barrier signal has the same function as the DOOR OPEN command.
Exception: If the door is open less than 1 cm, the light barrier signal is ignored. If no power is
supplied at the light barrier input, this is interpreted as an interruption of the light barrier. The
door cannot then close.
If the light barrier signal is interrupted while the DOOR CLOSE command is active, the door
is moved in the OPEN direction. An interruption of the light barrier signal while the DOOR
CLOSE command is inactive does not change the state.
Connection and parameter assignment
SIDOOR AT40 / ATD400V / ATD400K (RELAY LB)
The light barrier signal can be connected via "Input 1" (X6). See also Section Digital input
signals (Page 131). The connected signal must be activated via the SIDOOR Service Tool
(
Main menu > General setup > Special parameters > Input 1
).
Note
The light barrier and DCPS (Door Closed Position Sensor) (Page 41) functions cannot be
implemented simultaneously.
SIDOOR ATD410W/ATD420W/ATD430W
The sensor signal must be generated by the PLC as part of the process image. See Table 6-
75 DCMD expansion bits (Page 207).
The status of the sequential control must be considered when using the LB signal. The
process data (including the LB signal) are only valid in the status "S4: Z_ operation" (see
Image 6-33 Sequential control state graph (Page 216)). The LB signal is evaluated in the
low-active state, but is not tested during the sensor function test.
Note
The light barrier signal is evaluated in the low-active state and must therefore be assigned 1
(= not interrupted).
When not in operating status "S4: Z_ operation" (see Image 6-33 Sequential control state
graph (Page 216)), the sensor signals are automatically assigned their resting signal value
so that they have no effect on the system status.
The travel range within which the controller reacts to the light barrier signal can be restricted
by parameter p1210. See Calibration and function parameters (Page 175).
You can find more detailed information on the light barrier in Section Overview (Page 159).