The Siemens 6AG1222-1BD30-5XB0 is a SIPLUS variant of the S7-1200 SB 1222 signal board, delivering 4 digital outputs at 24 V DC with a maximum per-channel current of 0.1 A. It snaps onto the front of an S7-1200 CPU, adding a compact output slice without expanding the DIN-rail footprint. This makes it suitable for cold storage, outdoor cabinets, or applications near washdown zones where condensation is a risk.
Each of the 4 outputs is rated 0.1 A maximum with resistive load at 24 V DC. The per-channel supply current draw is 4 mA max, and the residual current for signal "0" is held to 10 µA — important for preventing leakage through downstream loads like small relay coils or LED indicators. The module draws 50 mA typ from the 5 V DC backplane bus. Total power loss is 0.5 W typ — negligible in a crowded enclosure, but worth noting if the CPU's backplane supply is already loaded near its limit. There is no short-circuit protection on the outputs. The load wiring must be fused externally, or the application must rely on the load's own current-limiting behaviour. For signal "1", the permissible voltage range is L+ (-1.5 V) to L+; for signal "0", the max voltage is 1 V with a 10 kΩ load.
Environmental endurance and coating
The conformal coating (IPC-CC-830A Class A) protects against fouling per EN 60664-3 Type 1, and the module is resistant to commercially available coolants, lubricants, diesel, and oil droplets in the air. It also meets ANSI/ISA-71.04 environmental conditions for process control systems, including Level GX Group A/B gas concentrations, Level LC3 salt spray, and Level LB3 oil. Installation altitude is rated up to 5 000 m, with temperature derating above 2 000 m per the spec table. This covers high-altitude installations like mining or mountain-top telecom shelters without requiring a separate derating calculation.
Diagnostics and alarms are supported, including readback of the output status. The module is configurable in STEP 7 TIA Portal (see entry ID 109746275 for version requirements). Unshielded cable runs are limited to 50 m max; shielded runs are not separately specified but standard S7-1200 wiring practice applies.