Circuit for connecting a process computer by means of a number of analog channels with a machine tool

A circuit for connecting a process computer by means of a number of analog channels with a machine tool, comprising:

• an interface arranged at an input side of the circuit;
• a D/A-converter for converting digital data received from the process computer into analog signals which are to be delivered to the analog channels;
• a sequencer for multiplex control of a signal output to the analog channels;
• each analog channel containing an analog storage;
• two random-access memories arranged in circuit with and after said interface;
• a storage address line and a data bus cooperating with said interface;
• a further storage address line cooperating with said sequencer;
• a further data bus cooperating with said random-access memories;
• two reversing switches, defining first and second reversing switches, operatively connected with said interface and said sequencer and which can be set in opposition with respect to one another for connecting one of the random-access memories with the interface by means of said storage address line for writing-in 8-bit data by means of said data bus into said one random-access memory and for operatively connecting the other random-access memory by means of said further storage address line with the sequencer for reading-out data by means of said further data bus out of the other random-access memory and vice versa;
• a third reversing switch which can be selectively set by said sequencer;
• a channel data storage connected with the D/A-converter;
• a channel address storage;
• said third reversing switch alternately connecting the further data bus with the channel data storage connected with the D/A-converter and the channel address storage;
• a channel selector switch operatively connected with the D/A-converter;
• said channel selector switch being settable by means of the channel address storage;
• and
• said channel selector switch serving for switching the D/A-converter to the individual analog channels.