Siemens 6ES7317-6FF03-0AB0 CPU 317F-2 DP

Fail-Safe Central Processing Unit for S7-300 Systems

The Siemens 6ES7317-6FF03-0AB0 functions as a CPU 317F-2 DP fail-safe central processing unit for the SIMATIC S7-300 series. This controller integrates standard automation with safety-related control, supporting applications up to SIL 3 and PL e. The module features a substantial 1024 KB work memory and requires a Micro Memory Card for operation. Two integrated RS-485 interfaces provide flexible network connectivity: one MPI/DP interface running at 12 Mbit/s and a second DP master/slave interface. Consequently, this CPU handles complex safety programs while maintaining high-speed processing for standard control tasks.

Technical Specifications

Specification	Value
Model	6ES7317-6FF03-0AB0
Product Type	CPU 317F-2 DP (Fail-Safe CPU)
Work Memory	1024 KB
Load Memory	MMC pluggable, max. 8 MB
Processing Speed (Bit)	0.05 µs typical
Processing Speed (Float)	1 µs typical
Interfaces	2x RS-485 (MPI/DP + DP)
Transmission Rate (Max.)	12 Mbit/s
DP Slaves Supported	124 (max.)
Safety Standard	SIL 3 / PL e / Category 4
Dimensions (W x H x D)	80 mm x 125 mm x 130 mm
Weight	Approx. 460 g
Power Loss	4 W typical
Permissible Voltage Range	20.4 V to 28.8 V DC
Firmware Version	V2.6
Required Software	STEP 7 V5.2 SP1 + Distributed Safety V5.2 SP1

Safety Functionality and System Integration

The Siemens 6ES7317-6FF03-0AB0 employs a dual-channel internal comparison mechanism, executing safety programs through two independent processing paths. This architecture ensures fail-safe behavior during hardware faults. The CPU supports PROFIsafe protocol via its PROFIBUS-DP interface, allowing standard and safety data transmission on the same cable. Users can program the CPU with STEP 7 using LAD, FBD, STL, SCL, CFC, and GRAPH, with F-LAD and F-FBD for safety functions. The module supports up to 2048 blocks (DBs, FCs, FBs) and provides comprehensive diagnostics including process alarms and DPV1 interrupts. Operation requires a Micro Memory Card for program storage, and a backup time of 6 weeks at 40°C maintains the real-time clock.