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The 6ES7222-1HF22-0XA0 is an 8-channel relay digital output expansion module (EM 222) exclusively for S7-22X series CPUs. Utilizing passive dry contact outputs, it permits a hybrid connection of AC and DC loads, supporting DC voltages (L+) from 5 V to 30 V and AC voltages (L1) from 5 V to 250 V within a permissible frequency range of 47 Hz to 63 Hz.
Hybrid AC/DC and multi-potential control
Reliable hardware isolation and long-distance wiring support
Extremely low operational power consumption and extended lifespan
Its 8 channels are equally divided into two electrically isolated common terminal groups, delivering a rated output current of 2 A per channel and a maximum total current of 8 A per group. The module exhibits high load adaptability, running at a full 2 A under both resistive and inductive loads, supporting up to 200 W on AC lamp loads, and maintaining a residual leakage current of 0 mA in the OFF state, making it a reliable electrical bridge for conventional automation systems requiring high-capacity driving and multi-potential control with lower switching frequencies.
In terms of power consumption and physical protection, the module operates with low energy usage, featuring a typical power loss of only 2 W. Its internal circuits draw a maximum of 40 mA from the 5 V DC backplane bus and up to 72 mA from the external 24 V DC load power supply. To withstand industrial electromagnetic interference and protect the main control system, potential separation is implemented via relays between the channels and the internal logic, enabling the module to support cable lengths up to 500 meters for shielded cables and 150 meters for unshielded cables in long-distance wiring.
It must be noted that this module does not feature integrated electronic short-circuit protection or an inductive shutdown voltage limitation circuit. Users must provide external fuses and connect external suppression components when driving inductive loads to protect against reverse electromotive force, ensuring the mechanical contacts achieve their full lifespan of 10 million mechanical cycles and 100,000 cycles under rated load.
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Siemens 6ES7222-1HF22-0XA0 Digital output Module Manuals, Datasheets, Drivers, Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description.
Water & Wastewater Treatment
Directly drives contactor coils for small AC dosing pumps, switches 220V AC pneumatic valve solenoids, and powers high-power audio-visual alarms in central control rooms.
HVAC & Building Automation
Controls 220V AC inverter start loops for multi-stage air handling units, directly switches AC contactor coils for electric heaters, and drives motorized air damper actuators.
Automotive Manufacturing
Acts as mechanical dry contacts to send high-voltage isolated interlock signals to third-party non-Siemens equipment in electrophoresis coating lines or welding workshops.
Metallurgy & Steel Industry
Drives open/close motors for high-power motorized valves in furnace auxiliary control systems, and switches AC solenoid valves for heavy-duty hydraulic stations.
Rubber & Plastics Machinery
Controls high-power AC heater contactors for injection molding mold temperature controllers, and switches heavy-current vibratory feeders in plastic granulator feeding sections.
Cement & Building Materials Industry
Controls 220V AC powerful air-jet clearing nozzle solenoid valves on clinker conveyor lines, and illuminates remote high-intensity queuing indicator lights on top of mixing towers.
First, the module does not feature integrated electronic short-circuit protection; to prevent accidental external short circuits from instantly fusing the relay contacts or melting the housing, fast-acting fuses must be connected in series within the external output loops for physical protection.
Second, the module lacks an integrated inductive shutdown voltage limitation circuit. When driving frequently switched inductive loads like solenoid valves or contactors, external suppression components (such as flyback diodes for DC loops or RC snubbers for AC loops) must be wired in parallel across the output terminals to suppress reverse electromotive force and extend contact lifespan.
Lastly, this module does not support hot-swapping under power; you must ensure the entire system is completely powered off during onsite wiring, terminal block plugging, or module replacement to prevent damage to the contacts or internal circuitry.
Equipped with dual electrical isolation via optocouplers and physical mechanical gaps, it operates with a low power loss of 4.5 W. Featuring 8 channel status LEDs and a DIAG indicator on its enclosure, this module is well-suited for standard automation systems requiring high-capacity driving and multi-potential control with conventional switching frequencies.
It is the digital output expansion module (SM 1222 DQ 8 x relay) for the legacy Siemens SIMATIC S7-1200 PLC system.
What is the primary function of 6ES7222-1HF22-0XA0?
It is used to expand 8 relay-type digital output channels for the S7-1200 PLC control system to drive onsite AC or DC loads.
How to install and use a product like 6ES7222-1HF22-0XA0?
Snap it onto a standard DIN rail and slide it to the left to connect with the S7-1200 CPU or previous module via the built-in side bus connector, then wire the external power and control loops before configuring it in the software.
What is the difference between 6ES7222-1HF22-0XA0 and a transistor output module?
This module uses mechanical relay contact outputs, featuring higher switching voltage and current capacities, and supports both AC and DC loads, though its response speed is slower than transistor modules.
What is the maximum output current allowed per channel on 6ES7222-1HF22-0XA0?
At rated voltage, its relay contacts allow a maximum rated current of 2 A per channel.
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