Our customer was familiar with Allen-Bradley PLC Programming but had never programmed safety logic. DMC collaborated with our customer and provided safety logic programming services while our customer developed the main system logic. DMC provided training throughout the development and commissioning time so that the customer could support the program on their own.
The system had several E-Stop circuits, several safety zones which were controlled separately, basic VFD Safety (Safe Torque Off control), and safety gates which when properly entered allows for limited safe manual operation of the equipment. This safety strategy allowed the end-user to operate functions and perform maintenance in hazardous areas while allowing the rest of the unaffected equipment to function. DMC used the Allen-Bradley Safety-Certified Instructions in RSLogix 5000 as well as custom logic to complete this program. The final safety hardware and software implementation met SIL3 requirements.
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