(1) When measuring the clock signals and data signals of the 4 hydraulic cylinder displacement sensors, the clock signals are around DC 2.8V, with an AC component of approximately 0.123V; the data signals are also around DC 2.8V, with an AC component of approximately 0.245V. From this, it can be determined that both the PLC clock and the MTS data bit transmit/receive pulse loops are functioning normally.