Product Overview
With a rated load voltage of 120/230 V AC and 16 isolated digital outputs, the Siemens 6ES7422-1FH00-0AA0 provides robust control for industrial automation systems. This SIMATIC S7-400 digital output module (SM 422) is engineered for demanding applications requiring high switching capacity and built-in fault diagnostics. Its compact 25 mm width and integrated fuse protection make it a dependable choice for manufacturing and process environments.
Technical Specifications
| Parameter |
Value |
| Load Voltage L1 (Rated) |
120/230 V AC |
| Load Voltage Range |
79 V to 264 V AC |
| Frequency Range |
47 Hz to 63 Hz |
| Input Current (Backplane Bus) |
400 mA at 5 V DC |
| Power Loss (Typical) |
16 W |
| Number of Digital Outputs |
16 |
| Short-Circuit Protection |
Yes – Fuse 8 A, 250 V per group |
| Output Current – Signal "1" Rated |
2 A |
| Output Current – Surge (per cycle) |
50 A |
| Output Delay (0→1) |
Max. 1 ms |
| Output Delay (1→0) |
Max. 1 AC cycle |
| Potential Separation |
Between channels (groups of 4) and backplane bus |
| Isolation Test Voltage |
1500 V AC |
| Dimensions (W x H x D) |
25 mm x 290 mm x 210 mm |
| Weight (Approx.) |
800 g |
Application Scenarios
The Siemens 6ES7422-1FH00-0AA0 excels in controlling AC loads such as motors, contactors, and solenoid valves in manufacturing cells, conveyor systems, and packaging lines. Its built-in diagnostics – including INTF (red) for fuse blown and EXTF (red) for missing load voltage – enable rapid fault identification, reducing downtime. The module’s ability to handle lamp loads up to 50 W and motor starters up to NEMA Size 5 makes it suitable for both lighting control and heavy equipment activation.
Troubleshooting Guide
When the INTF LED illuminates red, check the per-group fuse (8 A, 250 V, quick response) and replace if blown. An EXTF LED indicates missing load voltage on one or more output groups; verify that the AC supply is within the permissible range (79–264 V) and properly connected. The diagnostics function is not parameterizable, so these indications are the primary tool for fault isolation. Ensure that the total current per group does not exceed 4 A (up to 40 °C) or 2 A (up to 60 °C) to avoid overload.
Maintenance & Reliability
Periodically inspect the fuse holders and replace any blown fuses with the specified type (8 A, 250 V, quick response). The module’s potential separation and 1500 V AC isolation ensure safe operation in high-voltage environments. For extended reliability, operate within specified temperature limits and use shielded cables up to 1000 m to minimize EMI. The fan assembly can increase total group current to 6 A (up to 40 °C) for higher-density installations.
Selection Guide & Purchasing Advice
Before purchasing the Siemens 6ES7422-1FH00-0AA0, confirm your S7-400 rack backplane compatibility and required load voltage. This module is ideal for applications needing isolated AC outputs with built-in overcurrent protection. For additional support or to place an order, contact PLC Source PRO (formerly ubest101) – a trusted supplier of industrial automation spares. Verify your system voltage, fuse ratings, and mounting orientation to ensure seamless integration.