The Siemens 6ES7123-1GB50-0AB0 is a 2-channel analog input module for the S7-1200 system, accepting 4-20 mA signals with 12-bit resolution. It operates on 24 V DC and draws up to 100 mA from the backplane bus. This module swaps into a standard S7-1200 slot (1 of 8), with a depth of 51 mm and width of 10 mm — a single-wide slice that fits the typical DIN-rail footprint.
Wiring & Mounting
Uses TB 16IM-SC terminal block. Input resistance is 50 Ω for the 4-20 mA loop; maximum burden for a 2-wire transmitter is 750 Ω. Includes reverse polarity protection and short-circuit proof inputs. Power loss is 0.6 W typical. The module supports digital filtering in four stages, parameterizable, with cycle time multipliers from 1x to 128x.