Used PLC Analog Input/Output Modules – Buying and Selling

Used PLC analog modules include analog input (AI), analog output (AO) and mixed I/O models. Depending on the model, they operate through the local PLC bus or a remote I/O system. Select for compatibility with the existing PLC CPU and rack/base unit.

Before buying, compare the complete model code, hardware/firmware revision, AI/AO channel count and signal ranges. For analog-output sensors, verify input ranges such as 0–10 V or 4–20 mA; for RTDs/thermocouples, confirm support for the specific sensor. Check voltage/current ranges for outputs as well. Assess resolution, accuracy, conversion time and channel isolation, together with power demand, the PLC power supply and system limits.

Condition and testing: Disclose the condition of terminals and backplane contacts, housing damage and corrosion. The test statement should identify the channels and signal ranges checked, plus known faults. Include any repair history, calibration/measurement records and missing parts. Clarify whether front connectors, terminal blocks and the base unit are included in the sale.

Sale terms: The seller named on the product page is the contact for specifications, condition/test statements and any warranty. Boxed or unused condition does not imply a warranty. There is no category-wide testing or warranty commitment; technical support and application consultancy are not provided through this section.

Stock and ordering: Listings are updated at average intervals of 10 days, so a sold item may remain visible briefly. Confirm availability, price and delivery with the relevant seller before ordering. Browse other equipment through the used equipment categories, or search by brand on the second-hand homepage.

Selling analog modules: Email the manufacturer, complete model code, hardware/firmware revision if readable, quantity, operating or faulty condition, asking price and clear product/nameplate photos to otomasyonavm@gmail.com. Include channel-by-channel test information and details of missing accessories. We do not purchase products without an invoice. Submitting details does not constitute a commitment to purchase.