I/O Modules
Modbus I/O modules for cabinet expansion, signal acquisition, and relay control. Choose from compact DI/DO modules, high-power relay output modules, isolated digital input modules, analog input modules, and analog output modules.
Prices shown do not include taxes, import duties, VAT, customs clearance fees or shipping. Final project configuration may be confirmed separately.
Y301 Selection Guide
Choose I/O modules by signal type and cabinet task.
For Y301 modules, the model name is less important than the signals you need to collect or control. Start from DI, DO, AI and AO, then check channel count and Modbus RTU requirements.
Prepare these details before inquiry
- Signal type: DI, DO, AI, AO or relay output
- Channel count and whether isolation is required
- Analog range: 4-20 mA, 0-10 V or custom
- RS485 wiring, Modbus address and power supply
DI
Digital input acquisition
For dry contacts, switches, pulse signals, alarm contacts and status feedback from field devices.
DO / Relay
Output control
For relay control, indicator lamps, small loads, interlock signals and control cabinet expansion.
AI / AO
Analog signal handling
For transmitters and instruments using current or voltage signals, such as pressure, level and flow.
Need
Typical module direction
What to confirm
Read equipment status
Digital input module
Dry/wet contact, pulse rate and isolation
Control relays or indicators
Digital output or relay output module
Load type, output rating and wiring method
Collect sensor values
Analog input module
Signal range, accuracy needs and grounding
Expand a PLC or gateway cabinet
Mixed I/O module
Channel mix, Modbus map and cabinet space
Practical tip: if the site has many small signals, choose by wiring and channel count first. If the site has analog instruments, confirm signal range before comparing prices.
