An improvement in a module for a programmable controller including logic circuits and means for enabling the circuits upon receipt of a module enabling signal. The improvement includes a first set of input terminals arranged on the module and in a preselected pattern having a successive numerical order of 1, 2, 3 . . . n; a set of output terminals arranged on the module in the preselected pattern; means on the module for connecting the input terminal at position number one to the enabling means; means on the module for connecting each of the remaining input terminals to output terminals in the corresponding next lower numerical position of the preselected pattern of output terminals.