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Y305 PLC I/O Modules

Programmable PLC I/O for Local Control

Run your control program where the signals and equipment connect. Choose digital I/O, with 0–10 V analog I/O on selected models.

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Y305-4400 PLC I/O module
Y305-4400 · 4 digital inputs and 4 digital outputs
  • Local PLC programConditions, timing and sequences
  • 4 to 18 DI + DOChoose the required channel count
  • 0–10 V analog I/OAvailable on models ending in 21

Local control

Program the response your equipment needs

Read field signals, evaluate your logic and drive outputs from a program running on the Y305. Combine conditions, timers, sequences and interlocks for the task.

  1. 01

    Read signals

    Connect switches and compatible sensors to the fitted digital and analog inputs.

  2. 02

    Execute the program

    Process states and timing in local PLC logic, using an FX3U-style device and instruction model.

  3. 03

    Control outputs

    Switch suitable load circuits through relay or NPN outputs. Analog-equipped models also provide a 0–10 V output.

Y305 uses GX Works2. Confirm the software version, project setup and programming interface for the supplied hardware and firmware. Test the program before connecting equipment.

Application examples

From equipment sequences to level control

Define the conditions and output actions in your program, then test them against the equipment and its electrical limits.

01 / Digital I/O

Sequence equipment operation

Read start, stop and equipment status contacts. Combine permissive conditions and timers to control an external contactor or alarm circuit.

Inputs → program conditions and timing → output circuit

02 / Digital + analog I/O

Monitor level and control a pump

A model ending in 21 reads a 0–10 V level signal. Program the operating conditions and control a suitably rated external pump contactor. The 0–10 V output can send a command to a compatible receiver.

Level + status → program logic → contactor / analog command

These are design examples, not preloaded programs or safety functions. Validate wiring, interlocks, startup and recovery on the intended equipment.

Choose the control role

Y305 PLC I/O or Y301 Serial I/O?

Start with where the application logic will run, then compare signals and electrical limits.

Y305 PLC I/O

Run a user PLC program on the module to combine field inputs, timing and output control. Add RS485 when communication is needed.

Compare Y305 models

Y301 Serial I/O

Connect field I/O to an existing Modbus host. Selected Y301 models also support local rules, including relay and analog threshold rules.

Explore Serial I/O

Y305 model selection

Compare Models

Select digital channel count, then choose whether your application needs 0–10 V analog I/O.

The code positions represent DI / DO / AI / AO. E = 14 and J = 18. Relay outputs and RTC are standard; NPN transistor outputs and RS485 are specified separately. Confirm availability and electrical limits for the ordered hardware.

Specify the signals and load

Channel count is the starting point. Match the ordered hardware to the complete circuit and control task.

Output hardware

Relay contacts are the default; NPN transistor outputs are an option for DC loads. Check voltage, load type, inrush, common-terminal and protection requirements.

Analog and communication

Models ending in 21 provide 2 AI and 1 AO at 0–10 V. Select the required RS485 port configuration separately.

Clock and high-speed functions

RTC is standard. Confirm clock backup and recovery; specify any high-speed counting or pulse requirements for the hardware.

Documents and programming

Review wiring, the first program and registers before integrating the module.

User ManualInstallation, wiring and initial checksOpen manual Programming GuideFirst program and control designOpen guide Technical ManualDevices, registers and communicationOpen manual

FAQ

Questions about programming, signals and choosing a Y305 module.

How is Y305 different from Y301 Serial I/O?

Y305 runs a user PLC program for local control. Y301 primarily connects field I/O to a serial host; selected Y301 models also support local rules. Choose according to the control logic, signals and interface your application needs.

How is the Y305 programmed?

Y305 uses an FX3U-style device and instruction model with GX Works2. Confirm the software version, project settings, programming interface and transfer procedure for the delivered hardware and firmware.

Which models support analog signals?

Y305-4421, 8821, EE21 and JJ21 provide two 0–10 V inputs and one 0–10 V output. Models ending in 00 have no analog I/O. Do not connect a 4–20 mA loop directly to the voltage inputs.

What is the difference between relay and transistor outputs?

Relay outputs switch a contact circuit and are the default. Optional NPN transistor outputs sink DC current. Confirm load voltage, current, inrush, common-terminal ratings and protection for the supplied hardware before wiring.

Does Y305 need an external controller?

A Y305 can run its local PLC program without an external controller. RS485 is an ordering option for communication with other devices; specify the required ports and verify the configuration.

Can Y305 be used as a safety PLC?

No. Do not use Y305 as a safety PLC or the sole protective control. Provide independent safety functions where required.

Tell Us What You Need to Control

Share the equipment, input signals, output loads, channel count and any communication requirements. We can help you identify a suitable configuration.