6ES7315-2AH14-0AB0

Product information

The 6ES7315-2AH14-0AB0 is a Siemens SIMATIC S7-300 central processing unit designated CPU 315-2 DP. It provides 256 KB of work memory with an integrated 24 V DC power supply, an MPI interface and a second PROFIBUS DP interface configurable as master or device. A Micro Memory Card is required.

As a mid-range S7-300 CPU with a dedicated PROFIBUS DP master/device interface, this part is widely found in installations where a distributed I/O network is the architecture and the program fits within 256 KB. Its bit-operation time of 0.05 µs is twice as fast as the compact CPU 314C variant, which matters on time-critical logic.

Technical specifications

Manufacturer / family	Siemens · SIMATIC S7-300
Product type	CPU 315-2 DP
Hardware functional status	01
Firmware version	V3.3
Engineering software	STEP 7 V5.5 + SP1 or higher, or STEP 7 V5.2 + SP1 or higher with HSP 218
Work memory	256 kbyte integrated, not expandable
Load memory	Micro Memory Card (MMC), max. 8 Mbyte
CPU processing time, bit operations	0.05 µs typical
Interface 1	MPI (RS 485)
Interface 2	PROFIBUS DP, master / device
Integrated I/O	None — I/O is added through S7-300 modules
Isochronous mode	Yes
Supply voltage	24 V DC (permissible 19.2–28.8 V DC)
Current consumption	850 mA rated · 150 mA typical at no load
Power loss	4.5 W typical
Backup	Maintenance-free via MMC — program and data retained without battery

Specifications as published in Siemens product data for this article number. Verify against the nameplate of the unit offered to you.

Lifecycle status

Siemens product data identifies this article number as a spare part. Installations running the CPU 315-2 DP therefore depend on surplus supply for replacement CPUs — and because the program normally sits on the MMC rather than in the CPU, keeping the existing memory card is usually what allows a replacement CPU to be commissioned quickly.

Typical applications

• Mid-size machines and plant sections with distributed I/O over PROFIBUS DP
• Applications where the CPU acts as DP master to a network of ET 200 stations
• Retrofit and spare-part supply on established S7-300 installations
• Time-critical logic where the faster bit-operation time of this CPU is relevant

Application examples describe typical uses of this product type. Suitability for your own installation must be confirmed against your engineering documentation.

Related references in the S7-300 range

• 6ES7317-2EK14-0AB0 — CPU 317-2 PN/DP, 1 MB work memory, PROFIBUS DP plus PROFINET
• 6ES7314-6EH04-0AB0 — CPU 314C-2 PN/DP compact CPU with integrated I/O
• 6ES7153-2BA10-0XB0 — ET 200M IM 153-2 DP HF interface module

Before you order

To confirm a specific unit, please provide the complete ordering code, hardware functional status, firmware version, a nameplate photograph, the quantity required and the delivery destination. Availability, condition, quantity, lead time and commercial terms are confirmed individually after inquiry.

Frequently asked questions

Does the CPU 315-2 DP have integrated I/O?
No. It is a central processing unit only; I/O comes from S7-300 signal modules or from distributed I/O on the PROFIBUS DP network.

Can the PROFIBUS DP interface be used as a slave?
Yes. The second interface is configurable as master or device.

Is a Micro Memory Card needed?
Yes, up to 8 Mbyte. Program and data can be retained on the MMC without a battery.

Is this CPU still produced?
Siemens lists it as a spare part. Confirm availability for the specific revision and firmware you require.

What is the price and lead time?
Confirmed individually against current availability for the specific revision and quantity.