A320 is identical to the above.
Pilotbrandon7606 is there a reason you don't believe what the FCOM says? OP CLB armed is definitely a function of the A320. See:
OP CLB arms, when all of the following conditions are applicable:
- The aircraft is on ground, or SRS is engaged (TO or GA), and
- NAV is neither armed nor engaged, or the vertical flight plan is not available, and
- The ACCEL altitude is available and below the FCU selected altitude.
So if NAV is not armed for take-off, you will have OPN CLB armed rather than CLB.