Omron D41D Manual page 12

D41D
Operating Principle
Operating Principle
The safety outputs can be connected to the safety circuit of the control
system. The opening of a guard door, i.e. the actuator is removed out
of the active zone of the safety door switch, will immediately disable
the safety outputs of the safety door switch. (For operating distances,
refer to Ratings and Specifications on page 5.)
Any error that does not immediately affect the functionality of the
safety door switch (e.g. too high ambient temperature, interference
potential at the safety outputs, cross-wire short) will lead to a warning
message, disabling of the auxiliary output and a delayed shutdown of
the safety outputs. (Refer toTroubleshooting on page 16.)
The safety outputs are disabled if the error warning is active for 30
minutes. The signal combination, auxiliary output disabled and safety
channels still enabled, can be used to stop the production process in a
controlled manner.
After fault rectification, the error message is reset by opening and
reclosing the corresponding guard door. The safety outputs enable
and allow a restart.
12
Diagnostic Functions
Operating principle of the diagnostic LEDs
The safety door switch indicates the operating condition and faults by
means of three-color LEDs located in the lateral surfaces of the safety
door switch.
The green LED indicates that the safety door switch is ready for
operation. The supply voltage is on and all safety inputs are present.
Flashing (1 Hz) of the green LED signals that a voltage is missing on
one or both of the safety inputs (X1 and/or X2).
The yellow LED always signals the presence of an actuator within
range.
If the actuator is operating near the limit of the differential travel range
of the safety door switch, the LED is flashing.
The flashing can be used to prematurely detect variations in the
clearance between the safety door switch and the actuator (e.g.
sagging of a guard door). The safety door switch must be adjusted
before the distance to the actuator increases and before the safety
outputs are disabled, thus stopping the machine. If an error is
detected, the red LED will be activated.
Operating principle of the auxiliary output
An auxiliary output additionally indicates the operating condition (refer
to Table 1). The auxiliary output OUT can be used for central
visualization or control functions, e.g. in a PLC. It indicates the
switching condition as shown in Table 1.