Phoenix Contact 1104975 The configurable safety module features 8 safe inputs, 4 safe outputs, and either 4 reset inputs or 4 signal outputs, with 4 clock outputs available for expansion via the TBUS interface. The module can be upgraded to SIL 3, Cat 4/PL e levels of protection, with a plug-in push-in terminal block but without a TBUS connector being included as standard.