Long time ago OP DES. had answered the following:
This is an excerpt from the Honeywell FMGS manual: BANK ANGLE LIMITSThe bank angle limits, roll limit 1, and roll limit 2 are defined by the rolllimit graph shown in Figure 5-3 and are based on true airspeed. Duringan engine out condition, both limits are set at 15°.Control Roll LimitDuring selected headingmode, the flight guidance part of the computerimposes the roll limits.During managed heading mode, the flight management part of thecomputer imposes the roll limits based on true airspeed and the activesegment of the active leg, depending on the need for simple turn control(the path over the ground is not fixed) or fixed path control (a definedpath over the ground).D For simple turn control (while turning to a heading target) roll limit 2is imposed.D For fixed path control (in legs to capture a path) the FMS uses eitherroll limit 1 or roll limit 2 as required below:— Roll limit 1 - When the turn does not result in a captured andengaged leg.— Roll limit 2D When flying an arc to capture and engage a legD When flying an arc to a fix unless:- The active leg is a holding pattern or procedure turn whenroll limit 2 is imposed.- The aircraft is within lateral overshoot navigation limits,(then the en route roll limit is 15°), except in the terminalarea where roll limit 2 is imposed.The roll limit for lateral path construction is always the bank limit, rolllimit 1, or roll limit 2 for a specific true airspeed.FMS Roll LimitFigure 5-3NOTE: Below 700 ft radio altitude, when in LAND track and LOCtrack, bank angle is further limited to 10° by the flightguidance function.ROLL LIMIT SUMMARYRoll limit 1 is used for most straight line segments of a flight leg, and bythe FMS when the heading is managed.Roll limit 2 is used by the FMS on most managed transitions in theterminal area, and for specific procedures such as holding patterns,procedure turns, and arcs