6ES7222-1BH32-0XB0 SIMATIC S7-1200
The Siemens SIMATIC S7-1200 6ES7222-1BH32-0XB0 is a digital output expansion module belonging to the S7-1200 series of compact programmable logic controllers. This module is part of the SM 1222 signal module family and provides 16 digital outputs, extending the I/O capacity of an S7-1200 CPU. It is designed to integrate seamlessly into the S7-1200 modular system for small to medium-scale automation tasks.
The 6ES7222-1BH32-0XB0 features 16 relay or transistor digital outputs depending on the variant, with this specific module providing 16 digital outputs at 24 V DC. The module connects directly to the S7-1200 CPU via the integrated I/O bus on the left side of the CPU, requiring no additional wiring between the CPU and the expansion module. It supports a wide operating temperature range and is built to DIN rail mounting standards, making it suitable for installation in standard control cabinets. The module is configured and programmed using Siemens TIA Portal (Totally Integrated Automation Portal) software.
The SIMATIC S7-1200 SM 1222 digital output module is widely used in manufacturing automation, machine building, conveyor systems, and process control applications. Its compact form factor and ease of integration make it suitable for OEM machine builders and system integrators who require scalable I/O expansion without significant panel space. Industries such as food and beverage, automotive, packaging, and building automation commonly deploy this module to control actuators, solenoids, relays, and other output devices.
Technical Specifications
| Number of Digital Outputs | 16 |
|---|---|
| Output Voltage | 24 V DC |
| Output Current per Channel | 0.5 A |
| Total Output Current | 8 A |
| Output Type | Transistor (source) |
| Supply Voltage | 24 V DC |
| Power Consumption (from backplane bus) | 4 W |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | -40 °C to +70 °C |
| Relative Humidity | 5% to 95% (non-condensing) |
| IP Rating | IP20 |
| Mounting | DIN rail (35 mm) |
| Dimensions (W x H x D) | 45 mm x 100 mm x 75 mm |
| Weight | Approx. 180 g |
| Certifications | CE, UL, cULus, RCM |
| Series/Product Family | SIMATIC S7-1200 SM 1222 |
Common Diagnostic Codes
- Fault Code 1
- Configuration mismatch between the configured module and the physically installed module detected by the CPU.
Verify that the module type and order number in the TIA Portal hardware configuration match the physically installed module. Re-download the hardware configuration to the CPU. - Fault Code 2
- Module not recognized or missing — the CPU cannot communicate with the expansion module on the I/O bus.
Check the physical connection between the CPU and the expansion module. Ensure the module is properly seated and the I/O bus connector is undamaged. Replace the module if communication cannot be established. - Fault Code 3
- Output short circuit or overload detected on one or more output channels.
Identify and disconnect the shorted or overloaded output channel. Check the connected load wiring for short circuits. Replace any damaged field devices before re-enabling the output. - Fault Code 4
- 24 V DC load voltage supply missing or below permissible range.
Measure the 24 V DC supply voltage at the module terminals. Verify the power supply unit output and check wiring connections. Restore the supply voltage to within the specified range. - Fault Code 5
- Module parameter assignment error — invalid or unsupported parameters have been written to the module.
Review the module parameter settings in TIA Portal. Reset parameters to default values and re-download the hardware configuration. Ensure the TIA Portal version is compatible with the installed firmware. - Fault Code 6
- Internal module hardware fault detected.
Cycle power to the system. If the fault persists after power cycling and reconfiguration, the module has an internal hardware failure and must be replaced.
Frequently Asked Questions
What type of outputs does the 6ES7222-1BH32-0XB0 provide?
This module provides 16 transistor (source-type) digital outputs rated at 24 V DC with a maximum current of 0.5 A per channel.
Which S7-1200 CPUs is this module compatible with?
The SM 1222 module is compatible with all S7-1200 CPU variants including the CPU 1211C, CPU 1212C, CPU 1214C, CPU 1215C, and CPU 1217C, subject to the maximum number of expansion modules supported by each CPU.
What software is required to configure this module?
The module is configured using Siemens TIA Portal (Step 7 Basic or Professional, V11 or later). It is not compatible with the older STEP 7 Classic software used for S7-300/400 systems.
Can this module be used without an S7-1200 CPU?
No, the SM 1222 expansion module requires an S7-1200 CPU to operate. It connects directly to the CPU via the integrated I/O bus and cannot function as a standalone unit.
What is the maximum number of SM 1222 modules that can be connected to a single S7-1200 CPU?
The maximum number of signal modules depends on the CPU variant. For example, the CPU 1214C supports up to 8 signal modules, while the CPU 1211C does not support any signal module expansion.
Troubleshooting
Module outputs do not switch despite the PLC program commanding them ON
Check the output status in TIA Portal online diagnostics or watch table. Verify that the 24 V DC load supply is present at the module terminals. Confirm that the output is not disabled by a hardware fault or forced value.
Restore the 24 V DC load supply if missing. Remove any forced values in TIA Portal. If a short circuit fault is active, identify and correct the wiring fault on the affected channel before re-enabling the output.
Module is shown as faulty or unavailable in TIA Portal hardware diagnostics
Check the physical seating of the module on the DIN rail and the integrity of the I/O bus connector between the CPU and the module. Compare the installed module order number with the configured module in TIA Portal.
Reseat the module firmly and inspect the I/O bus connector for bent or damaged pins. If the order number does not match the configuration, update the hardware configuration in TIA Portal and re-download. Replace the module if the fault persists.
Outputs switching erratically or unexpectedly
Check for noise or interference on the 24 V DC supply line. Review the PLC program logic in TIA Portal for unintended output coil conflicts or multiple writes to the same output address.
Install appropriate filtering or a dedicated power supply for the output load circuit. Correct any program logic errors causing conflicting output commands. Ensure proper grounding and shielding of output wiring.
Module gets excessively hot during operation
Measure the ambient temperature inside the control cabinet. Check the total load current drawn by all 16 output channels against the 8 A maximum total current rating.
Reduce the total connected load to within the 8 A limit. Improve cabinet ventilation or add a cooling fan. Ensure the module is mounted with adequate spacing as specified in the S7-1200 system manual.
| Condition | Repair, Used, Refurbished, New in box (sealed) |
|---|