5. Display Module To reduce space while enhancing the operability of facilities, automakers need a touch panel that can serve as both a machine operation screen and as a CNC operation screen. The GOT1000 Series as the C70's display module satisfies this need. The GOT1000 Series line ranges from a compact 3.7” size up to a wide 15” size at XGA resolution. The CNC monitor (Fig. 3), which functions as a CNC operation screen, can be installed in 10.4”, 12.1” and 15” type GT15 monitors with SVGA or higher resolution, which will work as the machine’s main operation panel. Other smaller monitors can be used as sub operation panels. A GOT, which functions as the main operattion panel, is directly connected to the dedicated interface on the CNC CPU module (via Ethernet), ensuring rapid CNC screen display regardless of the PLC CPU throughput.
8. Safety Observation Function In response to growing demands for safety, we have incorporated a safety signal observation function into the C70, in addition to the existing speed observation function supported by the Mitsubish i CNC 700 Series. This existing speed observation function ensures safe machine operation even while the machine's protection door is kept open. To use this function, the door’s state signals have to be input to both the CNC CPU module and drive module. Then each module monitors the signals through two different routes. When the door is open, the machine is allowed to operate at a predetermined safe speed. Similarly, motor speed is observed by a drive aaa module and CNC CPU module through two different routes. If either module detects a motor rotating at a speed exceeding the predetermined safe speed, the motor will be immediately commanded to decelerate, and will stop and enter the power-shutdown state. When the door’s state signals input via two different routes do not match each other, the motor will decelerate, stop and enter the power-shutdown state. In this way, the speed observation function ensures a safe machine setup even without closing the door. Moreover, a new safety signal observation function allows both the CNC CPU module and PLC CPU module to monitor safety signals such as a light curtain signal that are input/output to/from both modules via two different routes, in addition to the door’s state signals. With this new function, CNC CPU and PLC CPU can monitor the signals via two different routes. As soon as either CPU detects any signal mismatch, the motor will decelerate, stop and enter the power-shutdown state. The safety signal observation function allows this type of safety system configuration to be provided without costly safe relays, whereas previously it was possible only with special hardware. This significantly reduces machine cost. In conclusion, the C70 allows devices to be used flexibly according to each environment. The C70 has tremendous potential to be used on not only automobile engine manufacturing lines but other sites where CNC has not yet been installed.