５ - ２ Register and Confirm Safety Signature Safety CPU program always must run correctly through equipment design to its operation. In this section, procedure to check that a safety signature is not unintentionally tampered from the original one by using NA at site at the time of startup, is described. When designing equipment or changing a safety program, register a correct safety signature in NA first. 26 5-2-1 Registration 1. Press [Safety Demo Screen]. 2. Press the [Signature View] button. 3. The Safety Signature Viewer screen appears. A current safety signature and a signature in the SD card are read out from the safety controller, and displayed. Note:
A signature in a safety controller is read out periodically. When the data is read out, the writing "Update" will blink. A signature for a restored file in the SD card is read out when a page is opened or the [Update] button is pressed.