When using GP-4100 series or GP-4*01TM, there is a limit for some of the features. 1.5.6.2 GP-4100 Series 1.5.7.2 GP-4*01TM
23.14.1 Restrictions on Passwords and IDs
23.14.2 Restrictions on Global Interlock
23.14.3 Restrictions on Operation Log
23.14.4 Restrictions When Setting a Security Level for Each Part
23.14.5 Restrictions When Changing the Password During Operation