What It Is and Where It Fits
The 6ES7215-1HF40-0XB0 is a fail-safe CPU with 24 V DC supply and PROFIsafe for safety communication.
Key Specs That Matter for Your BOM
Supply voltage: 24 V DC, minimum holding voltage is L+ minus 4 V DC. That means if your 24 V rail sags to 20 V (common in long cable runs), the CPU holds. No need for a separate boost converter unless you go below that. Temperature range: -40 °C to 70 °C. This covers most industrial enclosures, but watch the upper limit if the panel sits next to a motor drive without ventilation. MRP support: yes, as MRP redundancy manager and/or MRP client. So it handles ring topology directly — no external media redundancy module required. Good for fail-safe rings where you need both management and client roles. OPC UA server onboard — if the customer wants to pull data to an MES or SCADA without a separate gateway, this saves a slot and a license. MODBUS TCP/IP and UDP support, so legacy and non-Siemens field devices can talk without a protocol converter.
Certifications and Compliance
The CPU carries cULus and CE mark. That covers the typical North American and EU project requirements. No ATEX on the label, so if you need explosive-atmosphere rating, you'll need an additional barrier or a different model.
Mounting and Clearance
Width 130 mm, height 100 mm, depth 75 mm.