PLC is as the core of hardware system, and it comprises stepper motor, proximity switch, photoelectricswitch, hot resistance, electromagnetic valve et al.
硬件部分采用PLC作为控制核心部件，由步进电机、接近开关、光电开关、热电阻、电磁阀等组成。
2
Based on the standard of environment light source requirement in the photoelectric proximity switch tests, and the practical tests complied with this standard, the judgement difference was presented.
The alternation interface of intelligent instruments composed of lattice LCD and photoelectric coding switch makes its operation towards menu form and fully automatic.