Need a Y301 quote? Send I/O points for fast model matching.
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For PLC and SCADA Expansion

Choose the right Y301 Modbus I/O module in minutes

Send your DI/DO count, relay load, and quantity target. We will match the right Y301-110/200/020, Y301-220, Y301-440, or Y301-880 model before you finalize the BOM.

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Built for engineers and buyers replacing expensive PLC expansion cards or adding distributed DI/DO over RS485.

Y301 Modbus IO module series with compact and high-density models
1 / 2 / 4 / 8 point model options 5-36VDC supply -40 to +85C operation
  • Pick by DI / relay DO count first.
  • Check relay load voltage and current before BOM freeze.
  • Ask for Y301-222 or Y301-444 if analog input is required.
Quote-Ready Checklist
Prepare the details for a faster quote

The fastest recommendations come from a short I/O list and load details. Use this checklist before submitting the form below.

  • Total DI and relay DO point count
  • Load voltage/current and load type
  • Target quantity and project stage
Send My I/O List

Need to review first? Download the selector PDF.

Fast fit check before you request pricing

If these three points match your project, Y301 is likely worth quoting.

Modbus RTU expansion

Add distributed digital input and relay output points to PLC, SCADA, BMS, or gateway systems over RS485.

10A relay switching

Use SPDT relay outputs for HVAC, pumps, valves, alarms, lighting, and other loads within relay rating.

One family, many point counts

Start small with compact 1/2-point modules, then scale to 4DI+4DO or 8DI+8DO without changing the integration idea.

Y301 model selector

A short table is enough for most buyers to decide what to quote first.

Model I/O Mix Best Starting Point Notes
Y301-110 / 200 / 020 1DI+1DO, 2DI, or 2DO Small cabinets, single-load control, alarms, compact OEM nodes Compact 77 x 54 x 32 mm body. Relay models support SPDT 277VAC 10A / 28VDC 10A.
Y301-220 2DI + 2DO Balanced monitoring and relay control in small panels Good default when both status input and relay output are needed. Ask for Y301-222 when analog input is required.
Y301-440 4DI + 4DO Multi-zone equipment, BMS panels, utility control nodes Mid-density standard for projects that quickly outgrow 2DI+2DO. Ask for Y301-444 for analog input.
Y301-880 8DI + 8DO High-density digital expansion in one module Best when wiring density and one-device point count matter more than the smallest enclosure size.

Already know the point count?

Send DI count, relay DO count, load voltage/current, analog input needs, and target quantity. We will confirm the right Y301 model and quote path.

Request Quote Review PDF

Need a quote or model confirmation?

Share your point list and load details. We will propose the most practical Y301 model, highlight any relay or analog considerations, and suggest sample or project quantity options.

  • Tell us your point list: Include DI and relay DO count, plus whether analog is needed.
  • Tell us your load details: Voltage/current and load type help us flag wiring and relay considerations.
  • Tell us project stage: Pilot, rollout, or volume procurement helps us recommend the right package.

Need docs first? Y301-110/200/020 Specs | Y301-220 Specs | Y301-440 Specs | Y301-880 Specs

Quote + Engineering Review
Get the right Y301 recommendation

Share your point count, load type, and use case. We will send a fast recommendation.

We typically respond within 24 hours. No spam, ever.