Skip to content

Device integrations

Placement and cabling

Where to place the Volt DIO and how to wire a relay output and a digital input.

Put a Volt DIO in the cabinet where it has to switch a relay or read a contact. The controller reaches the module over the network, so the wiring to the relays and contacts stays short and inside the cabinet.

How many modules do you need?

  • One module per cabinet where you need inputs or outputs.
  • An extra module in the same cabinet when you need more than 6 inputs or 6 outputs there.
flowchart TD
  CTL["Voltmasters controller"] --> NW["installation network (Modbus TCP)"]
  NW -->|"network cable"| KA["Cabinet A: Volt DIO"]
  KA --> RA["relays and contacts"]
  NW -->|"network cable"| KB["Cabinet B: Volt DIO"]
  KB --> RB["relays and contacts"]

One module per cabinet: the number of modules follows the layout of the installation.

Wiring

Wiring example of a Volt DIO. Input: the plus of a 24 VDC supply runs through a normally closed contact to terminal DI0, the minus goes to terminal COM 0. Output: phase L of 230 VAC goes to terminal R0_C, terminal R0_NO goes to A1 of the coil of a contactor, A2 goes to neutral N. The contactor switches the load.

An input with a wet contact, and a relay output that switches the coil of a contactor.

  • Relay output. Each output is a potential-free, normally open contact between the terminals C and NO. Use it as a command contact, in the coil circuit of a contactor or in a stop or enable circuit. The contactor switches the load. What an output may switch directly is in the technical specifications.
  • Input with a wet contact. Feed 24 VDC through the contact to the input, and connect the minus to COM 0. A closed contact reads high, an open contact low.
  • Input with a dry contact. Connect the contact between the input and GND.

The terminal numbering is under Terminal block.

Network and power

  • Connect every module to the installation network, the same network the controller uses.
  • Give every module a fixed IP address and note the IP address, the port and the Modbus slave ID. You need them to add the module on the platform.
  • Power the module from the cabinet’s 24 VDC supply.

Each module has two Ethernet ports that act as a small switch, so you can daisy-chain modules. A daisy chain is a single path though: a module that loses power also cuts off the modules behind it. Connect a module that carries an emergency stop directly to the switch.

Next steps

Volt DIOAdd the module on the platform and assign its ports. Technical specificationsThe switching capacity, the terminals, the network and the power supply.