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FEATURE MACHINE BUILDING, FRAMEWORKS & SAFETY SAFETY SoluTionS


With safety ever more important, Turck Banner looks into the benefits of using its SI-RF Series safety switches and Emergency Stop buttons


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Feature


In an emergency, operators press the red button of the E-Stop to immediately shut down the machine


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afety is integral within manufacturing and production facilities – after all, no company will want to expose their operators to


potential danger. As such, if personnel have access to machinery with dangerous motion, safety systems are essential. Turck Banner offers a wide range of safety


solutions, so here we will be concentrating on two specific products. The first is safety switches, the second is emergency stop buttons.


SwiTching To SAFETY


Take an automated case packer as an example. These are enclosed on two sides by guard doors running the entire length of the machine, separating staff from the hazardous motion but also making it easy to access the equipment for routine maintenance and to resolve problems on the packing line. Each door must be monitored to ensure that it is closed when the case packer is started and that it remains closed while the equipment is in operation. To help, an SI-RF


actuator with a unique RFID code is mounted to each safety door on the case packer. Each actuator is paired with a safety sensor taught to recognise the actuator’s specific RFID code. This tamper resistant design ensures that safety functions will not be bypassed.


The SI-RF sensors are wired together in a


cascaded series which runs the length of the case packer. Each sensor is connected using a standard 4-wire cable with quick disconnect M12 connectors, T-adapters, and an end plug. The series will support up to 32 sensors and uses only two terminals on the safety controller, freeing space for other devices. If a door is opened, the sensor will send a


signal to the machine control system, bringing the hazardous motion to a halt and an alert will be sent to the HMI via the In-Series Diagnostics (ISD) interface. In-Series Diagnostics makes it possible to notify staff when an event, like a door being opened or closed, has occurred as well as where in the cascade series the event has occurred. Compact and suitable for machinery where vibration is present, the SI-RF Series safety switches offer high reliability. Used alone or in a series of cascaded devices, these operate at the highest levels of safety (PL e). Outputs on each sensor in the series are continuously monitored to detect any


faults, including short circuits. Of benefit, In-Series Diagnostics (ISD)


provides users with status and performance data from each sensor in a cascade chain, with data accessed with an HMI or similar device. Each SI-RF actuator has a non-modifiable RFID code that is taught to an SI-RF safety sensor. They are available in low code, high code and unique code


16 DESIGN SOLUTIONS NOVEMBER 2022


models, each offering increasing levels of tamper resistance based on the number of actuators.


EmErgEncY STop!


Another example where safety is essential is on a conveyor. Here, as products move along, Emergency Stop (E-Stop) buttons are linked 8-10ft apart to ensure all areas of the conveyor are covered in case of an emergency. In an emergency, operators press the red


button of the E-Stop to immediately shut down the machine. However, it can be time- consuming to determine exactly what E-stop button is pressed, and typically an emergency stop condition requires a reset of all the E-Stop buttons. Banner’s 30mm mount E-Stop buttons have


an illuminated base that turns from yellow to flashing red when actuated. The red flashing illumination of the E-stop button visibly alerts operators which button was pressed so they can quickly and easily fix the problem to reduce down- time and only reset the button that was activated. Along with visible indication of an E-Stop


button, the illuminated E-stops are available in an all-in-one enclosure with no assembly, individual wiring or additional enclosures required. Furthermore, the 30mm mount illuminated E-stop button has a 360 degree round housing, with a red button and yellow background, meeting worldwide safety standards. Models are also available in a non-lit, solid black base for additional safety applications.


Turck Banner www.turckbanner.co.uk/en


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