6ES7315-2EH13-0AB0 SIMATIC S7-300 CPU 315-2 PN/DP

SKU: 6ES7315-2EH13-0AB0 Category: PLC

Description
Additional information

The Siemens SIMATIC S7-300 CPU 315-2 PN/DP (part number 6ES7315-2EH13-0AB0) is a mid-range programmable logic controller belonging to the well-established S7-300 series from Siemens. It serves as a central processing unit for modular PLC configurations, capable of handling complex automation tasks with a high instruction throughput. This CPU is designed for demanding industrial control applications requiring both PROFINET and PROFIBUS DP connectivity in a single unit.

The 6ES7315-2EH13-0AB0 features 384 KB of work memory and supports a wide range of program and data structures. It is equipped with an integrated PROFINET IO interface (supporting IRT and RT) and a PROFIBUS DP master/slave interface, enabling flexible network integration. The CPU supports MPI communication, S7 routing, and can act as an IO controller on PROFINET networks. It includes a Micro Memory Card (MMC) slot for program storage and retentive data backup, and supports up to 32 PROFINET IO devices and 124 PROFIBUS DP slaves.

This CPU is widely deployed in manufacturing automation, process control, and machine building applications across industries such as automotive, food and beverage, chemical processing, and material handling. Its dual-network capability makes it suitable for systems requiring simultaneous PROFIBUS and PROFINET communication, such as mixed legacy and modern network architectures. The S7-300 platform's modular design allows the CPU to be combined with a broad range of signal, function, and communication modules to meet specific application requirements.

Technical Specifications

Work Memory	384 KB
Load Memory	Up to 8 MB (via Micro Memory Card)
Processing Speed (Bit Operations)	0.05 ms per 1000 instructions
Input/Operating Voltage	24 V DC
Current Consumption (from 5 V bus)	1.2 A
PROFINET Interface	1x RJ45, 10/100 Mbit/s, IRT and RT capable
PROFIBUS DP Interface	1x RS-485, Master/Slave, up to 12 Mbit/s
MPI Interface	Integrated (shared with PROFIBUS DP port)
Max. PROFINET IO Devices	32
Max. PROFIBUS DP Slaves	124
Timers / Counters	256 / 256
Operating Temperature	0 °C to +60 °C
Storage Temperature	-40 °C to +70 °C
Relative Humidity	10% to 95% (non-condensing)
Dimensions (W x H x D)	80 x 125 x 130 mm
Certifications	CE, UL, cULus, ATEX Zone 2

Frequently Asked Questions

What type of memory card does the 6ES7315-2EH13-0AB0 use?

This CPU uses a Siemens Micro Memory Card (MMC) for program storage and retentive data backup. The MMC is required for operation and must be inserted before powering the CPU.

Can this CPU act as both a PROFINET IO controller and a PROFIBUS DP master simultaneously?

Yes, the 6ES7315-2EH13-0AB0 supports simultaneous operation as a PROFINET IO controller and a PROFIBUS DP master, making it suitable for mixed-network environments.

What programming software is required for this CPU?

This CPU is programmed using Siemens STEP 7 (version 5.5 SP4 or higher). It is not natively supported by TIA Portal, though some migration tools are available.

How many I/O modules can be connected to this CPU?

The S7-300 rack supports up to 8 modules per rack, and with expansion racks connected via IM modules, the system can accommodate significantly more I/O modules in a distributed configuration.

Does this CPU support PROFINET IRT (Isochronous Real-Time)?

Yes, the integrated PROFINET interface supports both RT (Real-Time) and IRT (Isochronous Real-Time) communication, enabling precise synchronization for motion control and time-critical applications.

Troubleshooting

CPU remains in STOP mode after power-on and the STOP LED is continuously lit

Check the diagnostic buffer in STEP 7 (accessible via PLC > Module Information > Diagnostic Buffer) for the specific cause. Common reasons include a missing or faulty Micro Memory Card, a configuration mismatch, or a hardware fault.

Ensure a valid, correctly programmed Micro Memory Card is inserted. Clear the diagnostic buffer, verify the hardware configuration matches the physical setup, and perform a memory reset (MRES) before restarting.

PROFIBUS DP slaves are reported as unavailable or show BF (Bus Fault) LED

Inspect the PROFIBUS cable termination resistors at both ends of the segment. Measure bus voltage and check for correct baud rate settings on all nodes. Verify the DP slave addresses match the configuration in STEP 7.

Correct termination resistors (must be enabled only at both physical ends of the bus), fix any cable faults, and ensure all slave addresses and baud rates are consistent with the STEP 7 hardware configuration.

PROFINET IO devices go offline intermittently

Check the PROFINET cable connections and switch infrastructure for faults. Use the STEP 7 diagnostic tools or a network analyzer to identify packet loss or topology issues. Verify IP address assignments are unique and correct.

Replace faulty patch cables or switches, ensure IP addresses are correctly assigned and not duplicated, and verify that the PROFINET IO device names match those configured in the STEP 7 project.

CPU does not communicate via MPI with the programming device

Verify the MPI address of the CPU (default is address 2) and ensure the programming cable (e.g., PC Adapter USB) is correctly configured with matching baud rate and MPI address in STEP 7.

Set the correct MPI address and baud rate (typically 187.5 kbit/s) in both the CPU configuration and the PG/PC interface settings. Check the MPI cable and connector for physical damage.

SF (System Fault) LED is lit on the CPU

Access the diagnostic buffer via STEP 7 to identify the specific fault event. Common causes include a faulty I/O module, a configuration error, or a failed firmware component.

Replace any identified faulty I/O modules, correct hardware configuration mismatches in STEP 7, and re-download the configuration to the CPU. If the fault persists, perform a firmware update or contact Siemens support.

Condition	Repair, Used, Refurbished, New in box (sealed)