PERIPHERAL DEVICE AND DISPLAY METHOD OF PROGRAMMABLE CONTROLLER

PROBLEM TO BE SOLVED: To facilitate a continuous display and a real-time display of the contents of an internal device by displaying the contents of the internal device on a display means, which sequentially reads out and displays the storage contents of the programmable controller continuously while changing the cycles displayed by a specific key input. SOLUTION: When an operator inputs the name and number of a desired internal device whose contents are desired to be displayed by the operator from a peripheral equipment 1501, the contents of the internal device stored in a device memory of a CPU unit are read out through an interface 3206 for PC connection and displayed at a display part 1503. Then key input information from an input part 1504 is read out and when it is continuous display information indicating that a key is pressed, the set value of a display cycle timer 1502 is set to, for example, one second and a display cycle timer 1502 is started. Then, when the current value of the display cycle timer 1502 reaches one second, the contents of an internal device following the currently displayed internal device are displayed at the display part 1503.