Putlog scaffolding is not ledger braced, except below the first lift, where ledger bracing is required at alternate standards for stability during erection of the first lift.
In order to fix the ledger bracing at first lift, a foot tie should be connected to the standards with double couplers approx 150mm above the base plates. The ledger bracing is connected to the foot tie and the underslung inner ledger at the first lift height using double couplers.
Hope that helps!