A20B-3300-0260 Fanuc CPU Pentium Dual Check Safety

The simplest method of ensuring safety when the protection door is open is to shut off power to the motor drive circuit by configuring a safety circuit with a safety relay module. In this case, however, no movements can be made on a move axis (rotation axis). Moreover, since the power is shut off, some time is required before machining can be restarted. This drawback can be corrected by adding a motor speed detector to ensure safety. However, the addition of an external detector may pose a response problem, and the use of many safety relay modules results in a large and complicated power magnetic cabinet circuit. With the dual check safety function, A20B-3300-0260 two independent CPUs built into the CNC monitor the speed and position of motors in dual mode. An error in speed and position is detected at high speed, and power to the motor is shut off via two independent paths. Cnc-shopping . Processing and data related to safety is cross-checked by two CPUs. To prevent failures from being built up, a safety-related hardware and software test must be conducted at certain intervals time. If a position or speed mismatch is detected by a cross-check using two CPUs, the safety function of the Dual Check Safety works the power to be shut off (MCC off) to the motor drive circuit. FANUC A20B-3300-0260