3.4 Safety Functions; Optional Safety Equipment; Light Barrier - Siemens SIDOOR ATD401W System Manual

3.4 Safety functions
Introduction
Using the safety functions described below, you can:
● Expand the system with optional safety devices
● Use inputs with safe input signals according to performance level d (PL d)
3.4.1

Optional safety equipment

3.4.1.1

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 ATD410W/ATD420W/ATD430W
The sensor signal must be generated by the PLC as part of the process image. See Table A-
17 DCMD expansion bits (Page 288).
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
Figure 4-4 Sequential control state graph (Page 149)). 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 Figure 4-4 Sequential control state
graph (Page 149)), 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 179).
You can find more detailed information on the light barrier in section Overview (Page 152).
ATD4xxW Door Controller for Industrial Applications
System Manual, 01/2017, A5E38080677-AB
SIDOOR functions

3.4 Safety functions

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