http://blogs.sea.siemens.com/blogs/machine-safety/archive/2008/09/02/E_2D00_stops-and-Compliance.aspxCheck this out! Do you wire your e-stops to a standard (non Safety) PLC or controller in order to comply with the mandatory category 0 or 1 stop? Think twice is my advice! Yes, the safety standards such as NFPA 79, 9.2.5.4.1.3 require that an e-stop "shallenCommunityServer 2.1 (Build: 60809.935)