Failsafe CPU with PROFIsafe and integrated safety logic
The Siemens 6ES7513-1FL00-0AB0 is a failsafe CPU — the F designation means it runs safety programs up to SIL 3 via PROFIsafe. It supports FBD and LAD with failsafe blocks, so you can wire safety logic directly in the same programming environment as the standard control. The CPU handles 32 kB of inputs and 32 kB of outputs, all mapped into the process image. For a medium-sized safety application — say a packaging line with light curtains, e-stops, and interlock zones — that I/O budget covers the safety inputs and outputs without squeezing the standard I/O.
PROFINET IRT and MRP ring redundancy
This CPU includes a PROFINET interface with IRT (isochronous real-time) for deterministic cycle times down to 1 ms — critical when you synchronise drives or servo axes. It also acts as an MRP redundancy manager for ring topologies, supporting up to 50 devices in the ring. If a cable breaks, the ring reconfigures in under 200 ms; the line keeps running. The integrated web server serves standard and user-defined pages over HTTP and HTTPS. That means you can pull diagnostics or tweak parameters from a browser without loading TIA Portal — handy for a technician on the floor who just needs to see the fault buffer.
Backup time and memory card requirement
The CPU holds its program and retentive data for 6 weeks at 40 °C ambient without external power. That is enough for a plant shutdown or a weekend power loss — the program stays intact, and the CPU boots straight back into run when power returns. A SIMATIC Memory Card (not included) is required for operation — the CPU has no internal load memory. The card size depends on your project.
Communication modules and protocol support
The CPU accepts up to 6 communication modules (CMs or CPs) for PROFIBUS, additional PROFINET, or serial interfaces. That gives you flexibility if the application needs a legacy fieldbus or an extra Ethernet port — the modules snap onto the left side of the CPU and are configured in TIA Portal. Built-in protocols include MODBUS TCP, TCP/IP, UDP, SNMP, and LLDP. The CPU also supports S7 routing, so you can reach devices on other subnets through the integrated PROFINET port — no extra router needed for the control network.