The Siemens SIMATIC S7‑1200 module 6ES7222-1BH32-0XB0 extends an S7‑1200 basic controller with 16 digital outputs for controlling 24 V DC actuators. As an SM 1222 DQ16×24 V DC/0.5 A output module, it uses solid‑state transistor outputs (sourcing MOSFET type) capable of switching up to 0.5 A per channel, suitable for solenoid valves, indicator lamps, contactor coils and other DC loads. The module connects to the CPU via the S7‑1200 backplane bus and is configured in TIA Portal like any other S7‑1200 signal module.
The supply for the output electronics is 24 V DC with a permissible range from 20.4 to 28.8 V DC, and the module draws up to about 140 mA from the 5 V backplane bus with a power loss of around 2.5–5 W depending on load. Outputs guarantee a “1” signal at 20 V DC or higher and a “0” signal at 0.1 V DC or lower (with 10 kΩ load), ensuring reliable switching in industrial environments. Maximum output current per channel is 0.5 A for resistive and inductive loads and up to 5 W for lamp loads, with a total group current up to 8 A when mounted horizontally up to 50 °C.
Each of the 16 outputs has a status LED on the front panel for quick diagnostics, and the module supports diagnostic alarms that can be evaluated in the CPU program. Turn‑on delay is typically ≤ 50 µs and turn‑off delay ≤ 200 µs with resistive loads, enabling fast switching for many automation tasks. The outputs are grouped into one electrical group with isolation between outputs and the backplane bus at 500 VAC, and the module meets IP20 protection for installation inside an enclosure.
Mechanically, the SM 1222 DQ16×24 V DC module has dimensions of 45 × 100 × 75 mm (W × H × D) and a weight of about 0.22 kg, matching the compact S7‑1200 form factor. It is specified for operation from −20 to +60 °C (horizontal mounting up to +60 °C, vertical up to +50 °C) and up to 95% relative humidity at 25 °C, with storage temperature from −40 to +70 °C. Typical applications include adding digital outputs for valves, relays, signal towers and other actuators in small machines, building automation panels and general industrial control systems based on SIMATIC S7‑1200.
