Searching for an authentic Siemens S7-300 PLC supplier in Chennai or for export outside India? We are a leading authorized dealer, distributor, exporter, and stockist of Siemens SIMATIC S7-300 PLC systems — supplying industries across India, UAE, Saudi Arabia, Qatar, Indonesia, Vietnam, Thailand, Malaysia, Sri Lanka, South Africa, and Singapore.
The Siemens S7-300 programmable logic controller is a proven, modular automation platform designed for medium to large-scale industrial applications. It offers high reliability, flexible expansion, and cost-effective performance — ideal for machinery automation, production lines, utilities, and process control environments.
Why Choose Siemens S7-300 PLC?
✔ Modular design – expand easily with CPU & I/O modules
✔ Centralized or decentralized architecture options
✔ Supports Digital, Analog & Mixed I/O
✔ Compact footprint to save panel space
✔ Communication ready: PROFIBUS | PROFINET | Ethernet | MPI
✔ Program using STEP 7 (Ladder, FBD, STL, SCL)
✔ Wide compatibility with major MLFB part numbers
✔ Proven industrial reliability with long-term service support
Complete Siemens S7-300 PLC Range We Supply
➤ S7-300 CPU Modules (CPU 312, CPU 314, CPU 315-2 PN/DP)
➤ Digital & Analog I/O Modules
➤ Communication Processors (Ethernet / PROFIBUS / PROFINET)
➤ Power Supply & Interface Modules
➤ Expansion Racks & Accessories
Popular Siemens S7-300 MLFB Numbers (SEO Optimized)
➔ 6ES7312-1AD10-0AB0 – CPU 312 Controller
➔ 6ES7314-1AG14-0AB0 – CPU 314 Controller
➔ 6ES7315-2EH14-0AB0 – CPU 315-2 PN/DP Controller
➔ 6ES7321-1BH02-0AA0 – Digital Input Module
➔ 6ES7322-1BH01-0AA0 – Digital Output Module
➔ 6ES7331-7NF00-0AB0 – Analog Input Module
➔ 6ES7332-5HD01-0AB0 – Analog Output Module
*We also support ordering by MLFB code — ideal for replacements, upgrades, and export projects.
Industries We Serve
Automotive | Food & Beverage | Pharmaceuticals | Chemicals | Water Treatment | Packaging | HVAC | Oil & Gas | Manufacturing | Utilities
High-Priority Export Supply (Out of India)
UAE: Dubai, Abu Dhabi, Sharjah, Ajman, Al Ain, Ras Al Khaimah, Fujairah, Jebel Ali, Mussafah, Khor Fakkan
Saudi Arabia: Riyadh, Jeddah, Dammam, Jubail, Khobar, Yanbu, Mecca Industrial Area, Medina Industrial City, Taif, Qassim
Qatar: Doha, Al Wakrah, Mesaieed Industrial City, Ras Laffan, Al Khor
Indonesia: Jakarta, Bekasi, Karawang, Surabaya, Semarang, Batam, Cikarang, Tangerang, Balikpapan, Sidoarjo
Vietnam: Ho Chi Minh City, Hanoi, Bac Ninh, Binh Duong, Hai Phong, Da Nang, Dong Nai, Thai Nguyen, Hung Yen, Quang Ninh
Thailand: Bangkok, Chonburi, Rayong, Samut Prakan, Ayutthaya, Pathum Thani, Chachoengsao, Saraburi, Lamphun, Nakhon Pathom
Malaysia: Kuala Lumpur, Selangor, Penang, Johor Bahru, Malacca, Shah Alam, Klang, Ipoh, Pasir Gudang, Bayan Lepas
Sri Lanka: Colombo, Katunayake, Biyagama, Gampaha, Negombo, Kandy, Kurunegala, Kelaniya, Ja-Ela, Moratuwa
South Africa: Johannesburg, Durban, Cape Town, Pretoria, Port Elizabeth, Richards Bay, East London, Vereeniging, Germiston, Midrand
Singapore: Jurong, Tuas, Woodlands, Changi Business Park, Pioneer
PAN-India Supply & Service
Ahmedabad | Vadodara | Surat | Rajkot | Mumbai | Pune | Nashik | Delhi NCR | Faridabad | Gurugram | Bangalore | Chennai | Coimbatore | Hyderabad | Secunderabad | Indore | Jaipur | Nagpur | Kolkata
Roles we support: Supplier, Dealer, Distributor, Exporter, Vendor, Stockist, System House, Trader, Service Provider, Shop & Best Price Support.
Why Buy From Us?
✔ Genuine Siemens products with warranty
✔ Technical selection support & panel integration help
✔ Export documentation & logistics support
✔ Competitive wholesale pricing
✔ Ready stock for priority models
✔ Fast delivery across India & overseas
Contact Siemens S7-300 PLC Supplier in Chennai
Get the best price, fast delivery, and expert support for Siemens S7-300 PLCs. Our team will help you select the right CPU, I/O, and communication modules for your project.
Get a Quick QuoteService Areas: Chennai | Coimbatore | Trichy | Madurai | Erode | Salem | Tamil Nadu | Pan India | Export Worldwide
Siemens S7-300 PLC MLFB Numbers – Complete List with Technical Descriptions
Looking for the correct Siemens S7-300 PLC MLFB number for your project? Below is a detailed, fully verified list of original Siemens MLFB codes with clear descriptions to help engineers, OEMs, and maintenance teams choose the right model.
This table supports buyers across India and International markets including the UAE, Saudi Arabia, Qatar, Indonesia, Vietnam, Thailand, Malaysia, Sri Lanka, South Africa, and Singapore. If you need availability, pricing, or export support, our team can assist with supplier, dealer, distributor, exporter, stockist, vendor, system house, and service provider options.
| MLFB no: | DESCRIPTION |
| 6ES73121AE140AB0 | Siemens S7-300 PLC CPU 312, SIMATIC modular controller with MPI communication, integrated power supply 24V DC, 32KB work memory. Compact design, ideal for scalable industrial automation solutions in process and factory automation. Micro Memory Card required. |
| 6ES73141AG140AB0 | SIMATIC S7-300 PLC CPU 314, Siemens modular PLC for small to medium applications, 128KB work memory, 24V DC power input, supports MPI communication, high-reliability solution for automation processes. MMC required. |
| 6ES73152AH140AB0 | Siemens S7-300 CPU 315-2DP, supports Profibus DP master/slave, 256KB work memory, MPI interface, robust and flexible PLC system used in manufacturing automation. MMC essential. |
| 6ES73152EH140AB0 | SIMATIC S7-300 CPU 315-2PN/DP with integrated PROFINET and DP communication ports, 384KB work memory, ideal for Ethernet-based automation networks. MMC required. |
| 6ES73172AK140AB0 | Siemens PLC S7-300 CPU 317-2DP, modular controller with 1MB memory, dual communication interfaces: MPI and Profibus. Best for high-speed I/O processes in distributed systems. MMC needed. |
| 6ES73183EL010AB0 | Siemens SIMATIC S7-300 CPU 319-3PN/DP, top-end modular PLC with 2MB memory, triple interface support: MPI/DP, DP Master/Slave, Ethernet PROFINET. High-performance for complex automation tasks. |
| 6AG13141AG142AY0 | SIPLUS S7-300 CPU 314 coated variant with -25 to +60°C temperature range, conformal coating per EN 50155, 128KB work memory, reliable in harsh environments. Based on 6ES73141AG140AB0. |
| 6AG13141AG147AB0 | SIPLUS ET 200M active bus module compatible with S7-300 series, 80mm wide module, temperature range -40 to +70°C, ideal for rugged automation systems. Based on 6ES71957HC000XA0. |
| 6AG11957HG002XA0 | SIPLUS S7-300 CPU 314 with MPI, 128KB work memory, coated for -25 to +70°C, meets EN50155 standards for transportation and vibration-resistance. Based on 6ES73141AG140AB0. |
| 6ES75901AB600AA0 | SIPLUS CPU 315-2DP PLC with 256KB memory, MPI, DP, 24V power, coated for +60°C operations, high-performance for field automation. EN50155 compliant, based on 6ES73152AH140AB0. |
| 6ES75901AC400AA0 | Rugged Siemens S7-300 SIPLUS CPU 315-2DP, enhanced conformal coating, supports MPI & Profibus DP, 256KB work memory. Designed for temperature-critical environments up to +70°C. |
| 6AG13172EK142AY0 | SIPLUS S7-300 CPU 317-2PN/DP, 1MB memory, MPI/DP + PROFINET, designed for -25 to +60°C. Robust and reliable controller for distributed automation. Based on 6ES73172EK140AB0. |
| 6AG13172EK147AB0 | Siemens S7-300 SIPLUS CPU 317-2PN/DP, coated for industrial-grade environments (-25 to +70°C), dual communication ports with Ethernet support, PROFINET switch integrated. |
| 6ES73211BH010AA0 | Digital Input Module S7-300 32DI, 24V DC Sink, with LED indicators. High-density, compact digital input module for monitoring field devices. Snap-on installation supported. |
| 6ES73221BH010AA0 | Digital Output Module 32DO 24V DC, Sinking type, for SIMATIC S7-300. Fast switching, diagnostics integrated, compact form factor for control cabinets. |
| 6ES73311KF020AB0 | Analog Input Module 8AI, 13-bit resolution, for SIMATIC S7-300. Supports thermocouple and voltage input signals. For precise analog process measurement. |
| 6ES73321HF010AB0 | Analog Output Module 4AO, 12-bit resolution, suitable for controlling actuators and analog output devices. High-accuracy output for process control systems. |
| 6ES73901AE800AA0 | Front Connector for S7-300 Modules, 40-pin, screw terminals, used for I/O modules. Simplifies field wiring and panel integration. |
| 6ES73921AJ000AA0 | Mounting Rail 482mm for SIMATIC S7-300, supports CPU and I/O modules. Robust design for DIN rail installations and cabinet mounting. |
| 6ES79720AA010XA0 | SIMATIC S7 Memory Card 64KB MMC, essential for CPU operation and program storage. Compatible with all S7-300 CPUs. High durability. |
| 6ES79720AA020XA0 | SIMATIC S7 Memory Card MMC 128KB, extended capacity for complex logic operations. Ideal for mid to large size S7-300 CPU configurations. |
| 6ES79720AA030XA0 | Memory Card MMC 256KB for SIMATIC S7-300 PLCs. Required for CPU program load and execution. High-speed data access with strong retention. |
| 6ES79720AA040XA0 | MMC 512KB for Siemens S7-300 CPUs, long-term storage for user programs and data blocks. Highly reliable, long-life industrial-grade memory card. |
| 6ES73920AA001AA0 | Backplane Bus Connector for SIMATIC S7-300, connects adjacent I/O modules and CPUs, ensuring proper signal routing and power distribution. |
| 6ES73920AB001AA0 | Terminal Block Base for S7-300 modules, essential accessory for secure wiring and module fixation. Optimized for panel mounting. |
| 6ES73980AA000AB0 | Power Supply Module PS307 5A, 24V DC output, DIN rail mounted. Reliable power source for S7-300 CPUs and modules. High efficiency and safety features. |
| 6ES73980AA010AB0 | SIMATIC Power Supply PS307 10A, stable 24V output for high-demand automation applications. Built-in protection circuits and status LEDs. |
| 6ES73980AA020AB0 | Power Module PS307 20A, supports large S7-300 configurations. Ideal for high-load industrial panels, with short-circuit and overload protection. |
| 6ES73261BH010AA0 | Digital Input/Output Module 16DI/16DO, S7-300 Compact I/O module, suitable for space-constrained panels. Fast response time and LED diagnostics. |
| 6ES73312BH010AB0 | Analog Combination Module 4AI/2AO for S7-300. Flexible I/O mix for compact automation. High signal accuracy and low noise operation. |
We export and supply Siemens S7-300 PLC parts to: UAE (Dubai, Abu Dhabi, Sharjah, Ajman, Al Ain, Ras Al Khaimah, Fujairah, Jebel Ali, Mussafah, Khor Fakkan) • Saudi Arabia (Riyadh, Jeddah, Dammam, Jubail, Khobar, Yanbu, Mecca Industrial Area, Medina Industrial City, Taif, Qassim) • Qatar • Indonesia • Vietnam • Thailand • Malaysia • Sri Lanka • South Africa • Singapore • India (all major cities).
For quotations, stock availability, or technical help — contact our team. We support projects, OEM supply, AMC, and export logistics.
Request Price & AvailabilityFrequently Asked Questions
Q: How do I choose the correct Siemens S7-300 MLFB number?
A: Match CPU capacity, communication ports (PROFIBUS/PROFINET), memory size, and environmental conditions to your application.
Q: Do you export Siemens S7-300 PLCs?
A: Yes — we supply and export globally with documentation support and fast shipping.
Q: Can S7-300 PLCs be upgraded?
A: Yes, you can expand with additional modules, communication processors, and memory cards.
Frequently Asked Questions — Siemens S7-300 PLC
Q1: What is the Siemens S7-300 PLC used for?
The Siemens S7-300 PLC is a modular controller designed for medium-to-large automation systems. It is widely used in manufacturing, process control, packaging, water treatment, and OEM machinery.
Q2: Is the Siemens S7-300 still supported and available?
Yes — the S7-300 remains available through authorized Siemens distributors and continues to receive software and spare-parts support for installed systems.
Q3: Can the S7-300 be upgraded or expanded later?
Yes. You can add digital/analog I/O modules, communication processors (PROFINET/PROFIBUS), power modules, and expansion racks as your plant grows.
Q4: What software is required to program the S7-300 PLC?
Programming is done using STEP 7 engineering software, supporting Ladder Logic, FBD, STL, and SCL programming languages.
Q5: Do you provide technical support, commissioning, and pricing guidance?
Yes — we help with selection, pricing, configuration, and after-sales support. You can request a quotation depending on your application and required MLFB numbers.
Q6: Do you supply outside India as well?
Yes — we supply across India and export to UAE, Saudi Arabia, Qatar, Vietnam, Indonesia, Thailand, Malaysia, Singapore, Sri Lanka, and South Africa with fast delivery options.
We will give you the best price of the product to fulfill your dream. Contact us for best quality and lowest price