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PLC Expansion Modules — Additional I/O and Functions for Industrial Controllers

Expansion modules allow you to increase the number of inputs/outputs on a programmable logic controller without replacing the CPU. Our catalog features over 330 modules for Siemens S7-1200/S7-300, Delta DVP, Mitsubishi FX/L, and Schneider Electric TWIDO/SR3 series. Available types include discrete (DI/DO), analog (AI/AO), temperature (PT100, thermocouples), and special-purpose modules (positioning, high-speed counting).

How to Choose a PLC Expansion Module

Module selection is determined by three criteria: signal type (discrete or analog), compatibility with the controller series, and the required number of I/O points. Discrete modules handle 24V on/off signals — buttons, limit switches, relays. Analog modules process proportional signals of 4-20 mA or 0-10V — temperature, pressure, level. Comparison of popular modules:

ModuleTypeInputs/OutputsPLC SeriesApplication
Delta DVP16SP11TDiscrete DI/DO8DI + 8DO (transistor)DVP-SConveyors, packaging lines
Siemens SM 1231 AI8Analog AI8AI (13-bit)S7-1200Temperature and pressure monitoring
Siemens SM 1232 AQ4Analog AO4AO (14-bit)S7-1200Valve and regulator control
Delta DVP06XA-E2Analog AI/AO4AI + 4AODVP-ES2/EX2Process control, HVAC
Mitsubishi FX2N-4ADAnalog AI4AI (12-bit)FX2NWeighing, batching

PLC Expansion Module Manufacturers

Our catalog includes modules from leading industrial automation manufacturers with proven sales in Ukraine:

  • Siemens — 99 modules across S7-1200 (SM 1221/1222/1223/1231/1232), S7-300 (SM 321/322/331/332), and LOGO 8 series. The standard for large industrial facilities.
  • Mitsubishi Electric — 96 modules across FX2N, FX3U, FX3G, FX1N, and L-series. Reliable solutions for machine tools and packaging equipment.
  • Delta Electronics — 89 modules across DVP-S, DVP-ES2/EX2, and DVP-EH2 series. Optimal price-to-performance ratio for serial machines.
  • Schneider Electric — 40 modules across TWIDO and SR3 (Zelio Logic) series. Compact solutions for building automation and HVAC.

Expansion Modules by Specifications

Select a module by signal type and channel count. Discrete modules range from 6 to 32 I/O points with relay or transistor outputs. Analog modules offer 12-bit to 16-bit resolution with 4-20 mA, 0-10V, PT100, and J/K/T thermocouple inputs. Communication modules with RS-485, Ethernet, and CANopen interfaces enable distributed control system architectures.

Warranty and Support

All PLC expansion modules come with an official manufacturer warranty of 12 to 24 months. Delivery across Ukraine via Nova Poshta and Ukrposhta. Payment options: bank transfer for businesses, card payment or cash on delivery for individuals. Free technical consultation on module selection and I/O system design.

Frequently Asked Questions

How do I determine how many expansion modules my project requires?

Create a signal table: count discrete inputs (buttons, sensors), discrete outputs (relays, valves), analog inputs (4-20 mA, 0-10V), and analog outputs separately. Add a 15-20% reserve for future expansion. Then select modules considering series limits: Delta DVP-S supports up to 8 modules, Siemens S7-1200 up to 8 signal modules (SM), S7-300 up to 32. For large systems (500+ points), use remote I/O via Profinet or EtherCAT.

What is the difference between transistor and relay outputs in expansion modules?

Relay outputs switch both AC and DC up to 2A, suitable for contactors, lamps, and solenoid valves. Lifespan: 100-300K switching cycles. Transistor outputs work with 24V DC only but offer response times as fast as 1 microsecond with unlimited switching life. Choose transistor outputs for PWM control, positioning, and high-frequency switching (over 1 Hz).

Can I connect a Siemens S7-1200 analog module to a Delta DVP controller?

No, expansion modules are compatible only with controllers from the same manufacturer and series. Siemens SM 1231 works exclusively with S7-1200/1215. For cross-platform integration, use remote I/O with standard protocols: Modbus TCP, Profinet, or EtherCAT — these work with controllers from any brand.

Which module should I choose for temperature measurement — PT100 or thermocouple?

PT100 (RTD) provides ±0.5°C accuracy in the -200 to +600°C range — ideal for food processing, HVAC, and pharmaceuticals. Type K thermocouples operate up to +1300°C with ±2.5°C accuracy — suited for furnaces, boilers, and metallurgy. Delta DVP04PT supports PT100/PT1000, Siemens SM 1231 RTD handles up to 8 channels of PT100/PT1000/Ni1000. For thermocouples, use Delta DVP04TC or Siemens SM 1231 TC.

How do I select an analog input module based on measurement accuracy?

Resolution determines the minimum measurement step: 12-bit = 4096 steps (±0.025% of full scale), 16-bit = 65536 steps (±0.0015% of full scale). For most applications (level, pressure, flow), 12-13 bit is sufficient — Delta DVP04AD, Mitsubishi FX2N-4AD. For precision measurements (batching, laboratory equipment), choose 16-bit — Mitsubishi FX3U-4AD, Siemens SM 1231.