CPU 416-3 PN/DP — configuration bounds and programming scope
The 6ES7416-3XR05-0AB0 is a Siemens SIMATIC S7-400 CPU 416-3 PN/DP, built for mid-to-large control applications. Its function model (FM) is limited by the number of slots and the number of connections — meaning the practical I/O count and communication partners are capped by the rack's physical slot count and the CPU's connection resource pool, not by a fixed process-image limit. Programming languages supported include CFC, FBD, LAD, SCL, STL, and GRAPH, giving the integrator full flexibility from continuous function charts down to statement list. MPI is not available on this CPU — communication relies on PROFIBUS DP (RS 485), PROFINET via CP, or PtP modules. The CPU handles 244 bytes of process-input data and 244 bytes of process-output data, with a total of 16 counters and a preset count of 120. Forcing is supported, which aids commissioning and fault-finding without modifying the program.
Communication and remote I/O constraints
DPV0 is supported; DPV1 is not. The CPU can execute up to 8 RDREC (SFB 52) and 8 WRREC (SFB 53) per interface, but no more than 32 across all external interfaces combined. Similarly, (SFC 59) and (SFC 58) are limited to 8 per interface. Routing is enabled when the interface is active. System status (RDSYSST) is limited to 8 calls. Parameter writing and diagnostic reading are each limited to 8 per interface. Topology reading is limited to 1 per interface. When using CP 443-1 communication processors, mixed operation of CP443-1 EX40 with CP443-1 EX41/EX20/GX20 is not allowed; a maximum of 4 CPs can be used in the central controller. PtP modules CP 440 and CP 441 are slot-limited and connection-limited respectively.
Environmental and compliance profile
The CPU is rated for 0 °C to 60 °C operating ambient. It carries ATEX II 3G Ex nA IIC T4 Gc certification, suitable for Zone 2 gas-group IIC applications with a T4 temperature class. cULus and CE marks are present, covering North American and European regulatory markets. Mechanical dimensions: 50 mm wide, 290 mm high, 219 mm deep — standard S7-400 single-width format for the rack.