Rise differential differential circuit and the falling edge of differential pulse circuit, discussed below.
Rose along differential pulse circuit, PLC is to cycle scan way work of, in PLC first times scan Shi, entered X0 by OFF into ON Shi, M100, and M101 coil connected, but in first line of M101 of often open touch points still connected, because the line has scan had has, until PLC second times scan Shi, M101 of touch points only disconnect, Y0 coil disconnect. Y0 is the on–time for a scan cycle, as shown in Figure 8.
Next introduce the falling edge of differential pulse circuit, as shown in Figure 9, when X0 from ON to OFF is connected a scan cycle M100, Y0 is a scanning pulse output, specific works, please themselves.
PLC ONE 