logic controller 98 may include a removable memory stick 104 onto which data and or programs developed on the external programming terminal may be retained so that reprogramming of the programmable logic controller 98 may be performed by simply changing the memory stick 104 referring still to fig2 inside the housing 47 the control signals of the injection molding machine 10 from interface cable 52 are received by a terminal block 96 of conventional design terminal block 96 allows these signals to be flexibly connected to i o terminals of the programmable logic controller 98 corresponding terminals of a first timer 100 or second timer 102 and or for signals to be passed between the programmable logic controller 98 and the timers 100 and 102 in normal use control signals from the controller 40 of the injection molding machine 10 will be provided from interface cable 52 directly to the programmable logic controller 98 and signals from the programmable logic controller 98 will be provided to one or both of the timers 100 and 102 generally the signals on interface cable 52 will be signals from the controller 40 effecting a common interface with material handling equipment however these signals may also be obtained from other input and outputs to and from the controller 40 depending on the availability of documentation and the knowledge of the installer referring now to fig2 and 3 during operation the programmable logic controller 98 may be connected via the terminal block 96 to controller output signals 108 generated by the controller 40 and exposed at output terminals 106 of terminal block 42 of the controller.