Siemens SIMATIC S7-300 Modules – 6ES7318-3EL00-0AB0

Name: Siemens SIMATIC S7-300 Modules – 6ES7318-3EL00-0AB0
Brand: Siemens

Model: 6ES7318-3EL00-0AB0

Brand Siemens

Series S7-300

Model 6ES7318-3EL00-0AB0

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Technical Dossier

Product Details And Specifications

Siemens SIMATIC S7-300 Series Technical Notes

The Evolution of SIMATIC S7-300 Architecture

The S7-300 platform was introduced in 1993 as a successor to the SIMATIC S5 series, addressing the need for modular scalability and open fieldbus communication. The initial CPU generation (CPU 312–CPU 318) operated on the MPI (Multi-Point Interface) bus exclusively. By the late 1990s, Siemens introduced integrated PROFIBUS-DP ports on CPU 315-2 DP and above, enabling direct field device communication without a dedicated communications processor.

Compatibility note: S7-300 CPUs are not directly interchangeable with S7-400 or S7-1500 CPUs. Signal modules (SM) and function modules (FM) are physically and electrically specific to the S7-300 backplane bus. STEP 7 V5.x is the primary programming environment; TIA Portal supports S7-300 via a compatibility layer from V13 SP1 onward.

SIMATIC S7-300 Full Catalog & Functionalities (SKU List)

CPU Modules

6ES7312-1AE14-0AB0: CPU 312, 32 KB work memory, MPI interface, compact entry-level controller.
6ES7313-6CG04-0AB0: CPU 313C, 128 KB work memory, 24 DI/16 DO/4 AI/2 AO onboard I/O, MPI.
6ES7314-1AG14-0AB0: CPU 314, 192 KB work memory, MPI, standard mid-range processing unit.
6ES7315-2EH14-0AB0: CPU 315-2 DP, 256 KB work memory, integrated PROFIBUS-DP master/slave.
6ES7315-2FJ14-0AB0: CPU 315-2 PN/DP, 256 KB work memory, PROFINET IO controller + PROFIBUS-DP.
6ES7317-2AK14-0AB0: CPU 317-2 DP, 1 MB work memory, dual PROFIBUS-DP, high-throughput applications.
6ES7317-2EK14-0AB0: CPU 317-2 PN/DP, 1 MB work memory, PROFINET IO + PROFIBUS-DP master/slave.
6ES7318-3EL00-0AB0: CPU 318-2 DP, 512 KB work memory, dual PROFIBUS-DP, up to 32 modules, high-end S7-300 CPU.
6ES7319-3BL00-0AB0: CPU 319-3 PN/DP, 2 MB work memory, 3 interfaces (2x PROFIBUS-DP + PROFINET), maximum S7-300 performance tier.

Digital Input / Output Modules (SM 321 / SM 322)

6ES7321-1BH02-0AA0: SM 321, 16 DI x 24 VDC, standard digital input module.
6ES7321-1BL00-0AA0: SM 321, 32 DI x 24 VDC, high-density digital input.
6ES7322-1BH01-0AA0: SM 322, 16 DO x 24 VDC / 0.5 A, transistor output module.
6ES7322-1BL00-0AA0: SM 322, 32 DO x 24 VDC / 0.5 A, high-density transistor output.
6ES7323-1BL00-0AA0: SM 323, 16 DI / 16 DO x 24 VDC, combined digital I/O module.

Analog Input / Output Modules (SM 331 / SM 332)

6ES7331-7KF02-0AB0: SM 331, 8 AI, configurable +/-10 V / 0-20 mA / thermocouple / RTD, 12-bit resolution.
6ES7332-5HB01-0AB0: SM 332, 4 AO x +/-10 V / 0-20 mA, 12-bit resolution analog output.

Communications Processors (CP)

6GK7343-1EX30-0XE0: CP 343-1, Industrial Ethernet TCP/IP communications processor for S7-300.
6GK7342-5DA02-0XE0: CP 342-5, PROFIBUS-DP master/slave communications processor.

Power Supply Modules (PS)

6ES7307-1BA01-0AA0: PS 307, 24 VDC / 2 A regulated power supply for S7-300 rail.
6ES7307-1EA01-0AA0: PS 307, 24 VDC / 5 A regulated power supply, standard rack supply.
6ES7307-1KA02-0AA0: PS 307, 24 VDC / 10 A regulated power supply, high-load configurations.

Sourcing Hard-to-Find & Obsolete SIMATIC S7-300 Parts

The SIMATIC S7-300 platform has entered the mature phase of its product lifecycle. Siemens has formally recommended migration to the S7-1500 series for new projects, and several S7-300 CPU and signal module variants have been discontinued or placed on RFQ availability review. This creates a sustained procurement challenge for facilities operating legacy S7-300 installations that cannot justify a full control system migration.

Quality Control for the SIMATIC S7-300 Range

S7-300 modules present specific testing requirements due to their backplane bus architecture and the diversity of communication interfaces across the product range. DriveKNMS applies the following verification procedures to all S7-300 inventory:

Backplane bus continuity and impedance testing using a dedicated S7-300 test rack with active CPU.
CPU modules: full STEP 7 / TIA Portal connectivity verification, MPI and PROFIBUS-DP interface functional test, memory read/write cycle validation.
Signal modules: channel-by-channel I/O verification under load conditions matching rated specifications (voltage, current, resolution).
Communications processors: Ethernet and PROFIBUS protocol stack verification using Siemens SIMATIC NET diagnostic tools.
Power supply modules: output voltage regulation test across 10%-110% load range, ripple measurement, and thermal stability check.
Visual inspection for capacitor condition, connector pin integrity, and conformal coating status on all PCB assemblies.
Firmware version documentation and compatibility cross-reference against known S7-300 CPU firmware matrices.

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