Maintenance without restart

When a machine is being main­tained, it is impor­tant that the per­sonnel can per­form the work con­sci­en­tiously and that the plant and machinery never starts up during this work. Dig­ital main­te­nance safe­guarding there­fore ensures that only autho­rised per­sons gain access.

For the safe per­for­mance of main­te­nance work, the new “key-in-pocket” main­te­nance safe­guarding system from Pilz pro­tects oper­a­tors from unau­tho­rised restart of a machine. The dig­ital main­te­nance safe­guarding system is based on the access per­mis­sion system PITreader and is imple­mented with the Pilz con­trollers PNOZ­multi 2 or PSS 4000. It guar­an­tees safety and indus­trial secu­rity, as only autho­rised per­sons can access the plant or machinery ­during the main­te­nance process. This pre­vents manip­u­la­tion and incor­rect oper­a­tion.

The personal ID is the key

Users receive an RFID key with their indi­vidual per­mis­sions that are read out with PITreader at the safety gate. One or more users autho­rised for main­te­nance work can use these to authen­ti­cate them­selves on the plant. In the con­troller, a ­per­son­alised secu­rity ID is stored in a safe list. The machine can now be switched off, the safety gate opened and the machine entered. “Key-in-pocket” makes sure that the machine does not restart in this time and that no unau­tho­rised per­sons gain access. After the main­te­nance work, all per­sons log out, the secu­rity IDs are removed and the machine can be restarted.

The solu­tion thus offers safety from a dan­gerous restart as well as indus­trial secu­rity, as manip­u­la­tion of the main­te­nance work is not pos­sible. The dig­ital main­te­nance safe­guarding system is spe­cially designed for machinery with dan­gerous areas that are secured with safety fences and thus offers a flex­ible, eco­nom­ical alter­na­tive
to mechan­ical lockout tagout main­te­nance
safe­guarding sys­tems.


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