Home / Industrial control equipment / Siemens PLC & Automation/ Siemens S7-300 PLC
We specialize in Siemens S7‑300 PLC modules for industrial automation maintenance, replacement and system upgrades. Our supply scope includes CPU modules, digital and analog I/O modules, power supply modules, communication modules and related units. Based on current availability, we provide fully tested refurbished modules, reliable used stock units and selected unused surplus items to help reduce downtime and replacement cost.
The images below are for product display purposes only and show common Siemens S7-300 module types. Actual supply depends on current stock and model availability. Please contact us for the latest inventory list and model confirmation.
Yes. We supply Siemens S7-300 PLC modules including CPU modules, digital I/O modules, analog modules, power supply modules and communication modules.
Refurbished Siemens S7‑300 modules are pre‑owned units that have been professionally inspected, cleaned and function‑tested on a compatible S7‑300 test setup. Any defective parts are repaired or replaced where required, and only modules that pass our full functional checks are shipped. These are ideal when you need reliable replacements at a lower cost than brand‑new parts.
industrialmonitordirect
Stock used Siemens S7‑300 modules are good‑condition second‑hand modules that have been removed from working systems or surplus inventory. They receive basic visual inspection and power‑on checks, but not the same depth of refurbishment as our fully refurbished units. Stock used modules are suitable for less critical applications or customers with very tight budgets.
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Unused Siemens S7‑300 modules are surplus items that have not been put into service. They may come in original or opened packaging and can be older production or discontinued part numbers. These are a good option if you prefer unused hardware while still keeping costs below current list prices for new modules.
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Yes. Depending on model availability, we can offer tested refurbished modules as well as selected stock and unused items.
Yes. If you share the module number, nameplate details or project requirement, we can help with basic model confirmation and specification reference.
Yes. We support international shipment coordination for overseas buyers according to packing, destination and order quantity.
Send us your Siemens S7-300 model numbers, required quantity and preferred supply condition, and we will help check stock availability, module type and suitable supply options for your project.
You can send CPU modules, I/O modules, analog modules, power supply modules or complete requirement lists.
We usually reply with stock confirmation and quotation details after reviewing your requirement