# Volt AIO

> The Volt AIO, the Voltmasters analog IO module: 4-20 mA inputs and outputs to follow a Fluvius telecontrol cabinet version 4 that steers with analog signals.

Source: https://voltmasters.io/en/docs/device-integrations/io-modules/volt-aio/

The Volt AIO reads the setpoints of the [telecontrol cabinet](https://voltmasters.io/en/docs/dso-rtu/grid-operators/fluvius/tck4/) as a current, sends them back as an echo and reads the Q mode. No PLC is needed between the cabinet and the EMS anymore.

## When do you need a Volt AIO?

A telecontrol cabinet version 4 offers the customer two interfaces, and the customer uses one of them (Fluvius TAU341K01, section 2.3):

| Interface | Signals | What you need |
| --- | --- | --- |
| **B1.2, IEC 60870-5-104** | Setpoints and feedback over ethernet | The controller’s [RTU connection](https://voltmasters.io/en/docs/dso-rtu/rtu-connection/) |
| **B1.1, analog** | 4-20 mA and potential-free contacts on terminal block XGX101 | A **Volt AIO** |

If an existing cabinet works analog today, for example with a PLC from another party, it stays that way: the customer may not change anything in the Fluvius cabinet. The Volt AIO then takes the place of that PLC. A Netflex cabinet always works over IEC 60870-5-104 and does not need a Volt AIO.

## At a glance

| Feature | Value |
| --- | --- |
| **Channels** | 6 analog inputs, 2 analog outputs, 2 digital inputs and 2 digital outputs. |
| **Analog signals** | 4-20 mA, with an error of at most 0.02 mA per channel. |
| **On communication loss** | The outputs go to a preset safe value. |

## How the signals work

Fluvius sends the P and the Q setpoint as a current, and selects the Q mode with two contacts. The Volt AIO sends both setpoints back as an echo and reports the Q mode back with two contacts. How to wire this is in the [commissioning of the telecontrol cabinet version 4](https://voltmasters.io/en/docs/dso-rtu/grid-operators/fluvius/tck4/#commissioning).

Both setpoints are a percentage of the installed power Pinst:

| Current | Setpoint |
| --- | --- |
| 4.000 mA | \-110 % |
| 4.727 mA | \-100 % |
| 12.000 mA | 0 % |
| 19.273 mA | +100 % |
| 20.000 mA | +110 % |

-   Fluvius sends in steps of 10 %, which is about 0.73 mA.
-   The echo has to send the same value back. Fluvius accepts a deviation of 0.1 mA per card. If the echo is further off, Fluvius considers the setpoint not received.
-   The installation has 3 minutes to reach a new setpoint.

What the EMS does with the setpoints and the Q mode is on [Telecontrol cabinet version 4](https://voltmasters.io/en/docs/dso-rtu/grid-operators/fluvius/tck4/).

## Configuring the module

Configure the Volt AIO before you connect it to the cabinet:

| Setting | Value | Why |
| --- | --- | --- |
| **Jumpers AI0 and AI1** | Current | From the factory the inputs are set to voltage. |
| **Jumpers AO0 and AO1** | Current | From the factory the outputs are set to voltage. |
| **Range AI0 and AI1** | 4-20 mA | The open-wire detection of the inputs works in this range. |
| **Input measuring mode** | Normal | The fast mode is less accurate: ±0.5 % instead of ±0.1 %. |
| **Range AO0 and AO1** | 0-20 mA | This lets the safe value be 0 mA. In the 4-20 mA range the lowest value would be 4 mA, which Fluvius reads as a valid echo of -110 %. |
| **Communication watchdog** | On | From the factory the watchdog is off. Without it, the outputs keep their last value when the link to the controller is lost. |
| **Safe value AO0 and AO1** | 0 mA | If the controller drops out, Fluvius sees a fault instead of an echo confirming a setpoint nobody executes anymore. |
| **Safe value DO0 and DO1** | Off | Both feedbacks drop, which is not a valid Q mode. |

## Commissioning

How to test the chain before the appointment with Fluvius is under [Telecontrol cabinet version 4](https://voltmasters.io/en/docs/dso-rtu/grid-operators/fluvius/tck4/#commissioning).

## Next steps

[Placement and cabling](https://voltmasters.io/en/docs/device-integrations/io-modules/volt-aio/placement-and-cabling/): Where the module goes, the power supply and the network.

 

[Technical specifications](https://voltmasters.io/en/docs/device-integrations/io-modules/volt-aio/technical-specifications/): The inputs, the outputs, the network and the failsafe behaviour.

 

[Telecontrol cabinet version 4 (TCKv4)](https://voltmasters.io/en/docs/dso-rtu/grid-operators/fluvius/tck4/): What Fluvius sends and what the EMS does with it.