Functional Safety

For process engineering applications which require both functional safety and intrinsic safety (Ex i), point-to-point structures with conventional signals are mainly used at present, predominantly isolators with galvanic separation. Devices from R. STAHL meet the requirements relating to functional safety for such applications to a very high degree. In addition, they are distinguished by low operating costs due to long test cycles and a long service life of well over 10 years. Investment costs can also be reduced considerably by using two-channel devices and series 9195 pac-carriers.

Single safety functions can be built up using isolators with limit value processing. R. STAHL provides two compact devices which meet this requirement both for Ex i and non-Ex i signal circuits. This local safety function saves money in small to medium automation solutions such as in modular system parts or machines.

HART communication is used for condition monitoring and predictive maintenance. Any influence by the safety function must be avoided when performing this task. The transmitter supply unit with signal duplicating function blocks the HART communication at one of the two outputs in order to eliminate any influence from I/O assemblies of the safety system.