The invention discloses a method for quickly testing a digital IO (input / output) point of a
programmable logic controller, which comprises the following steps of: writing a
test program to write an output mapping area K4Y0 by enabling
digital input ports X0 to X17 to correspond to output ports Y0 to Y17 one by one, reading a numerical value in an input mapping area K4X0 to verify, and then writing the digital IO point of the
programmable logic controller. According to the invention, each digital quantity input port and each digital quantity output port can correctly receive and feed back signals, so that no external
test equipment is needed in the test process, the test can be completed by using the input and output points of the
programmable logic controller body, the test method is simple and efficient, and the test method is simple in step and low in cost. The terminal of the movable programmable logic controller, which is easy to connect, can be copied quickly and can be plugged, is connected with a wire, and the test can be started after the programmable logic controller is plugged, so that the
test efficiency is high, the test can be completed in an extremely short time through a PLC program, and the test device can be suitable for
batch production and test operation of the programmable logic controller.