CPU 412-2 — what it is and what it does
The Siemens 6ES7412-2XJ05-0AB0 is a CPU 412-2 module for the S7-400 rack. It provides 244 bytes each of process input and output image, isolated from the backplane, and supports a wide range of programming languages: CFC, FBD, LAD, SCL, STL, and GRAPH. Communication is via MPI, RS 485, and PROFIBUS DPV1. The module is 25 mm wide, 290 mm high, 219 mm deep, and operates from 0 °C to 60 °C.
Key ratings and what they mean for fit
The 244-byte input and output image determines how many discrete or analog channels the CPU can map without external expansion — enough for a medium-sized machine cell. Isolation means the logic side is galvanically separated from the I/O bus, protecting against ground loops and transient faults on field wiring. The ATEX II 3G Ex nA IIC T4 Gc certification permits installation in Zone 2 gas environments (non-sparking, T4 temperature class). cULus and CE mark cover North American and European regulatory acceptance.
Sourcing and lifecycle
No lifecycle status is on record for this order code. The part is sourced to order against an RFQ — submit a request for pricing and lead time. For compliance documentation, the CE mark and cULus listing are confirmed; RoHS/REACH declarations are not in the evidence and should be requested at time of order.
Integration constraints
The FM (function module) limit is stated as 'Limited by number of slots and number of connections' — this is not a hard count but a physical and connection-based ceiling. CP 440 and CP 441 PtP modules are similarly slot-limited. For PROFIBUS DP, the RDREC and WRREC SFBs are limited to 8 per interface, with a total of 32 across all external interfaces. The SFC 103 is limited to 1 per interface. No mixed operation of CP443-1 EX40 with EX41/EX20/GX20 is allowed; max 4 CPs in the central controller.