Modules work with Banner STB self-checking touch buttons or can be retrofitted with existing mechanical palm buttons to create a complete, ergonomic two-hand control system. To ensure reliability, modules have a diverse-redundant microcontroller circuit and multiple redundant, force-guided (mechanically linked) output contacts. Anti-tiedown logic requires that both touch buttons are activated within one-half second of each other. Ac and dc voltages are available: 24V ac/dc, 115V ac/24V dc or 230V ac/24V dc. Modules are available with two or four normally open (NO) safety outputs. Non-safety auxiliary outputs are available on some models. Modules meet Safety Category 4 per ISO 13849-1 (EN 954-1) and functional Type IIIC two-hand control per EN 574. Removable terminal blocks allow convenient wiring and exchange of modules without rewiring. Optional mute inputs allow release of actuating buttons during the non-hazardous portion of the machine cycle. Available kits include module and two STB touch buttons. STB touch buttons are far more ergonomic than mechanical and difficult-to-activate capacitive buttons.