| 摘要 |
A PLC includes a detachable first storing unit configured to store first key data and protected from access, a second storing unit configured to store a user program in association with second key data, and a startup processing unit configured to execute startup processing for the PLC itself when a power supply is turned on. The startup processing unit includes a startup-processing-stop determining unit configured to read out the first key data stored by the first storing unit inserted in the PLC itself and the second key data stored in the second storing unit and associated with the user program and determine, based on collation of the read-out two key data, whether the startup processing is continued or the startup processing is stopped and abnormal processing is executed. |
