What this RTD module reads and where it drops in
The Siemens 6ES7134-4NB50-0AB0 is a 4-channel analog input module for the ET 200S distributed I/O system, purpose-built for resistance temperature detectors. It reads Pt100, Pt200, Pt500, Pt1000, Ni100, Ni120, Ni200, Ni500, Ni1000, and Cu10 — essentially the full roster of common platinum, nickel, and copper RTD curves. That covers most temperature sensing in industrial process lines without needing a separate converter per probe type. Power comes from the ET 200S backplane at 24 VDC — no separate field supply needed. The module draws 0.6 W typical, which keeps the thermal budget in a densely packed terminal block cluster manageable. It uses a sigma-delta integrating measurement principle, with a selectable integration time of 16.7 ms or 20 ms. The 20 ms setting rejects 50 Hz line noise cleanly; 16.7 ms handles 60 Hz. That matters when you are running RTD leads past VFDs or welding supplies in the same cabinet.
Filtering, diagnostics, and cable reach
Digital filtering is configurable in four stages: none (1× cycle time), low (4×), medium (32×), or high (64×). The high setting smooths a noisy signal but adds latency — fine for a slow thermal process, not for a fast-reacting temperature loop on a plastic extruder barrel. Diagnostics cover wire-break, overflow/underflow, and group error — each can be enabled or disabled independently. The group error is mapped to the red SF LED on the module face, so a glance at the rack tells you if any channel is faulted. Isolation between channels is not provided; the module is tested at 500 V DC between the I/O and the backplane. Maximum shielded cable length is 200 m. That is generous for a distributed I/O slice — you can reach a tank farm at the far end of the plant without a repeater, as long as the RTD leads are twisted-pair and grounded at one end.
No isochronous mode — this module is not for time-synchronized motion axes. It is a straight temperature input slice for process and discrete manufacturing.
No stock-holding claim; each order is verified against the BOM quantity.