The Siemens 6ES7921-5AD00-0AA0 is a 40-pole front connector module for the SIMATIC S7-1500 system, designed specifically for 2A output modules. It carries a rated voltage of 24 V DC and a rated current of 1 A per pole, with a total current maximum of 3 A when mounted horizontally.
Wiring and termination specifics
Terminals are at the top of the module, requiring a 3.5 mm screwdriver blade and a tightening torque of 0.4 to 0.7 N·m. Stripped length is 10 mm for both solid and ferruled conductors. Finely stranded wire with core end processing accepts 0.25 to 1.5 mm²; without processing, up to 2.5 mm². Up to two wires per connection are allowed, provided the sum of cross-sections fits within a single ferrule. The maximum wire length between the front connector module and the terminal module is 30 m.
No end cover plate is required. The insulating body material is designated as 'other' (not standard plastic).
It is a mature, active line item suitable for BOM freeze and routine replenishment.