VH-0808ETN Veichi VH-0808ETN Expansion module: 8 inputs / 8 outputs, Transistor (NPN), compatible with the VH series.

VH-0808ETN is a mixed VH-series right-side expansion module: 8 discrete inputs plus 8 NPN transistor outputs in one housing. It is the most versatile module in the set — it handles both reading signals and driving loads without taking two bus slots. Pick it for a compact node that needs inputs and outputs side by side.

Typical applications:

• A local machine node: buttons and sensors on the inputs, valves and relays on the outputs.
• Small standalone stations within one line.
• Saving bus slots when the module count is already nearing 16.

Note: the outputs are NPN, for a common positive. For a common-negative scheme there is VH-0808ETP. If you need inputs only, take VH-0800END; outputs only, VH-0008ETN.

Veichi VH-R — right-side expansion modules for the VH controller series

VH-R is not a standalone device but a set of right-side expansion modules for the VH300, VH500 and VH600 CPUs (and for the VH comms module). They add discrete inputs-outputs, analog, temperature measurement or weighing without changing the processor itself. The new expansion bus runs at up to 100 Mbps, so module traffic does not become a bottleneck even on fast machines.

Up to 16 right-side modules attach to one CPU. That lets you build exactly as many I/O points as the task needs: start compact and grow as the machine evolves. The module has no CPU of its own — it always works paired with a VH controller.

Which modules the VH-R series includes

• Digital output: transistor modules with 8 and 16 outputs, NPN or PNP — VH-0008ETN/ETP, VH-0016ETN/ETP.
• Digital input: modules with 8 and 16 inputs — VH-0800END, VH-1600END.
• Mixed I/O: 8 inputs plus 8 transistor outputs — VH-0808ETN/ETP.
• Analog and temperature: VH-4AD (4 analog inputs), VH-4DA (4 analog outputs), VH-4PT (4 Pt100 channels), VH-4TC (4 thermocouples), plus the VH-2WT weighing module.

How VH-R differs from VH-L and VH-RTU

In practice VH-R is the workhorse for I/O expansion: the right-side modules carry the bulk of a machine's inputs and outputs. VH-L is for a single left analog board, VH-RTU is for I/O spread across the equipment that you collect over the bus.

Which module to pick for which signal

• You only need the CPU with no expansion — see the VH300/VH500/VH600 controllers themselves.
• A left analog board or special function — that is the VH-L series.
• Remote, distributed I/O over the bus — take VH-RTU modules.
• Working in another brand's ecosystem — compare with Delta or Fatek.

Our experience with VH-R

VH-R right-side modules sell steadily together with VH CPUs — they are the natural way to tailor a configuration to a specific machine. The typical buyer question is how many modules to hang on one CPU and whether the bus copes: 16 right modules and 100 Mbps cover the vast majority of real machines. We suggest leaving room for 1–2 spare modules for future sensors. Customers often pair them with Veichi VFDs and Veichi operator panels on the same line.