PLC main control tie-in hominize interface, large contact type liquid crystal display, easy operation, easy decode.
主控制采用PLC搭配人机界面,大型触控式液晶荧屏,使操作简单,判读容易。
英语百科
Contact type
In mathematics, more precisely in symplectic geometry, a hypersurface of a symplectic manifold is said to be of contact type if there is 1-form such that and is a contact manifold, where is the natural inclusion. The terminology was first coined by Alan Weinstein.