CPU 315-2 PN/DP — technology controller with 8 FM and PROFINET IRT
The Siemens 6ES7315-7TJ10-0AB0 is a CPU 315-2 PN/DP from the S7-300 family, designed for mid-range control with integrated technology functions. It carries 8 FM (function modules) of memory, giving you room for moderately complex logic without an external memory card. The CPU supports LAD, FBD, STL, SCL, GRAPH, CFC, and HiGraph programming languages, so any Siemens-standard toolchain — STEP 7 V5.5 SP2 or higher with the S7-Technology option package V4.2 SP3 — can target it. The integrated PROFINET interface handles IRT (isochronous real-time) communication, UDP, and TCP/IP via loadable function blocks. That makes it suitable for motion-control or high-speed cam-switch applications where deterministic network timing matters. The CPU can act as both PROFINET client and server, and supports routing between PROFINET and other networks. Process-image size is 244 bytes each for inputs and outputs, with 16 overall modules addressable. No PROFIsafe capability — this is a standard safety-unaware CPU. For safety applications, you would need an F-CPU or an external safety relay.
Dimensions and mounting
The module measures 120 mm wide, 125 mm tall, and 130 mm deep — standard S7-300 form factor that snaps onto a DIN rail. The width is the same as most S7-300 CPUs, so it fits existing backplane layouts without panel rework.