The function package "Blanking", beginning with firmware version 3.10, contains the standard functions and also offers the option of parameterization of the protective field or teach-in of objects to be blanked. The following types of beam parameterization are possible:
- Floating blanking
- Reduced resolution
- Beam signal
Application example
Problem:
The feeder of a punch machine into which a strip of sheet metalis being introduced, must be secured with a Safety Light Curtain. Parts are punched out of the strip of sheet metal and collected in containers arranged on the side. The rear area of the punch is secured by a protective fence. There is a door in the fence with a 2-channel safety switch that is connected to the e-stop circuit of the punch machine. After the machine is turned on, a check shall be forced to test for correct functionality of the safety components. To save cost and maintenance work, as few safety devices as possible shall be used. Since the strip is quite thin, it cannot be guaranteed that at least one beam will always be interrupted in the blanking zone.
Solution:
The COMPACTplus receiver with the appropriate protective field height and a resolution of 14 mm with the function package "Blanking" has a relay cap, so that the punch machine’s safety circuit runs directly via the receiver. The feedback circuit of the safety circuit contactor is connected to M2. The start button is connected with L1. A lamp for start button lighting can be connected to output L2. The guard door safety circuit goes to inputs L3 and L4. Thus there is no need for a safety relay in the cabinet. A signal lamp on L5 indicates when an object outside the blanking zones interrupts the protective field.
|
|
