Control system for a numerically controlled machine

A control system, integrated into a single housing, for at least one numerically controlled machine, especially for a machine tool, the control system comprising:

• a personal computer board including an input device, a processor, a memory and a bus connecting said input device, said processor and said memory to each other, said bus having a control line and data lines;
• at least one CNC board including a processor, a memory, and a CNC-bus;
• a single, common control-system bus having a control line and data lines and being connected to the CNC-bus of said at least one CNC board, and
• a personal computer matching circuit connected between the control-system bus and the bus of said personal computer board,
• said personal computer matching circuit including:
• a read-write memory having data connections and a read-write switch-over input,
• an address multiplexer, an output side of which is connected to an address input of the read-write memory and an input side of which is connected to address lines of the control-system bus and also to address lines of the bus of said personal computer board,
• a bi-directional data multiplexer, one side of which is connected to the data connections of the read-write memory and another side of which is connected to the data lines of the control-system bus and also to the data lines of the bus of said personal computer board, and
• a control circuit having inputs thereof connected to the control lines of the control-system bus and the bus of said personal computer board, respectively and outputs thereof connected to switch-over inputs of the address multiplexer, the bi-directional data multiplexer and the read-write switch-over input of said read-write memory, respectively,
• said control circuit, in dependence on control signals in the control lines of said control-system bus and said bus of said personal computer board, driving said address multiplexer, said bi-directional data multiplexer, and said read-write memory in such fashion that, through said bus of said personal computer board, data under the desired address are written into and read out from said read-write memory.