VC3-1616MDT-4 Veichi VC3-1616MDT-4 PLC: 16 inputs / 16 outputs, transistor outputs, 24VDC supply, RS232/485, CANopen, Ethernet.

VC3-1616MDT-4 is the VC3 transistor DC version with four 200kHz pulse channels: 16 digital inputs, 16 transistor outputs, 24V DC supply. RS232/RS485 ports, CANopen and built-in Ethernet. A cost-trimmed take on the main MDT for tasks where four positioning axes are enough and the rest of the outputs are ordinary logic.

Typical applications:

• Up to four stepper/servo axes in a 24V DC panel.
• Feed or cut-to-length with several channels plus network exchange.
• A substitute for MDT where eight pulse channels are excess.

Note: for six channels there is VC3-1616MDT-6, for the full eight there is VC3-1616MDT. The direct AC counterpart with the same pulse count is VC3-1616MAT-4; the relay DC version for mixed loads is VC3-1616MDR.

Veichi VC3 — dual-core mid-range PLC with built-in Ethernet

VC3 is the third generation of Veichi controllers on a dual-core processor. We reach for it where VC1's basic logic falls short but a full EtherCAT bus is still overkill: 64,000 program steps, 0.065µs basic instruction, eight pulse inputs and eight outputs at 200kHz with S-curve ramping. The main reason to choose VC3 is the onboard ports: Ethernet (Modbus-TCP, up to 16 slaves) and CANopen (301/402 profiles) are built in, not added through a separate module.

This is a workhorse controller for a mid-complexity machine that needs both an Ethernet link to SCADA or an HMI and a few pulse-driven positioning axes. RS485, RS232 and USB Type-C for commissioning, up to 15 right-side expansion modules (up to 8 of them special), 8 external interrupts and a real-time clock.

What VC3 is good for

• Machines exchanging data over Ethernet: a line where the PLC feeds SCADA or polls several slaves over Modbus-TCP with no extra module.
• Pulse positioning: feed, cut-to-length, dosing on steppers and servos — eight 200kHz channels with S-curve.
• Linking VFDs over CANopen: controlling a group of Veichi VFDs over the 402 fieldbus.
• Packaging, textile, wood and metalworking: 16 or 32 onboard points plus modules for the rest of the signals.

How VC3 differs from neighbouring series

In practice VC3 is the sweet spot: it gives the built-in Ethernet and CANopen that VC1 lacks, without carrying the cost and complexity of the VC5 EtherCAT platform. If you need coordinated motion across many axes over a bus, that is VC5 or VH600 territory.

When VC3 is not the right fit

• You need coordinated bus motion, interpolation or an electronic cam — go for VC5 or VH600 with EtherCAT.
• The task is purely logic and budget-driven, with no Ethernet out of the box — VC1 will do.
• You need heavier pulse and motion functions in the VC3 form factor — look at the VC3M motion variant (transistor outputs + 200kHz, motion-control function).
• You work inside another brand's ecosystem — compare with Delta or Fatek.

Our experience with VC3

VC3 gets picked when a machine has "grown up" into a network: the typical buyer question is "can I get a link to the HMI and the VFDs without an Ethernet module". Yes — the port is on the board, and that is often the deciding argument against VC1. We recommend settling on the output type up front: for relay use the MAR/MDR versions, for fast pulse to steppers/servos the transistor MAT/MDT. Buyers often pair it with Veichi operator panels on the same machine.