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Product Description #

The RevPi MIO is an expansion module of the Revolution Pi product family and has 8 analog inputs, 8 analog outputs and 4 digital channels, which can be configured as digital inputs or digital outputs via software.

Components #

revpi-mio-aufbau
Position Component Application

1

X2 connector
4 × configurable digital input/output

Parameterization

2

3 × status LED

LEDs

3

8 × analog input
8 × analog output

Pinout,
Parameterization

4

X4 connector

Connecting the Power Supply

5

Locking clamps

Mounting the Device on a DIN Rail

6

Ventilation Slots

Mounting the Device on a DIN Rail

7

2 × PiBridge

Connecting Expansion Modules

Pinout #

The RevPi MIO has

  • 4 digital I/O channels, identically assigned and configurable collectively as either inputs or outputs

  • 8 analog inputs for voltage

  • 8 analog outputs for voltage

The pins on the connector for the analog inputs and outputs are assigned as follows:

revpi-mio-pinout
Caution
Damage to the device due to voltage input on the analog outputs

▷ Make sure the pins are connected correctly.

For details on configuration, see Parameterization.

LEDs #

The LEDs indicate different device statuses.

Power
Signal Function

Green

The connection to the RevPi base module is established.

Flashes red

The connection to the RevPi base module is being established (initialization phase).

Red

The connection to the RevPi base module is interrupted.
OUT
Signal Function

Flashes red

A voltage above 10.5 V is set at one or more analog outputs.
NOTE: This feature is no longer supported from firmware version 1.1.
IN
Signal Function

Green

One or more analog inputs are being used.

Flashes red

The voltage at one of the inputs exceeds the defined value of 10 V.

Compatible Base Modules #

Left side only:

See also Rules for the Arrangement of Devices.

Scope of Delivery #

The scope of delivery includes

  • RevPi MIO (expansion module)

  • PiBridge plug connector

  • X2 connector

  • X4 connector

  • 2 × 14-pin I/O connector

  • Product insert

Mounting and Connecting #

The RevPi was developed for use in a control cabinet. Follow the specifications for Intended Use and all Safety Instructions.

Warning
Danger to life due to electrical shock

There is a risk of fatal electrical shock when working on devices in the switch cabinet with 230 V mains voltage.

▷ Operations in the switch cabinet may only be carried out by qualified electricians.

▷ Before carrying out any operations in the switch cabinet, switch off the power supply properly.
Caution
Damage to the device due to overheating

The ambient temperature in the switch cabinet must not exceed the maximum permissible operating temperature.

▷ Keep ventilation slots clear.

▷ Observe the installation clearances.

▷ Mount the device in the intended orientation.

▷ Do not place appliances with high input power directly next to each other.

▷ Regularly remove dust and dirt from the area around the appliance.

Carry out the mounting and connection in the following order:

  1. Mount the RevPi base module and all expansion modules on a DIN rail.

  2. Connect the expansion module via PiBridge plug connector.

  3. Connect all other devices such as sensors and actuators.

  4. Finally, connect the power supply.

Connecting the System Ground (GND) #

Caution
Damage to the device due to different grounding

▷ Refer all connections to the same system ground.

▷ Connect external voltage inputs or outputs with different grounding externally.

A system ground connection is available for all inputs and outputs on the 28-pin connector, which is connected through to the RevPi expansion module. All inputs and outputs refer to a common system ground as reference potential.

▷ Connect the system ground and the ground from the external voltage input (e.g. of a controller) with low impedance.

Configuration #

An expansion module is configured as part of the module configuration of the Revolution Pi system, i.e. a RevPi base module with expansion modules. This is possible via the application PiCtory or, if applicable, directly in the development environment, e.g. via CODESYS.

Note

CODESYS and PiCtory cannot be used in parallel for configuration. An existing configuration via PiCtory will be overwritten by a configuration via CODESYS.

The virtual devices OPC UA Server and MQTT Client can only be used via PiCtory.

Parameterization #

The following parameters, inputs (INP), outputs (OUT) and memory variables (MEM) can be configured:

DigitalInput_1 … 4 (INP) #

Indicates the level at digital input 1 … 4 is applied.

  • 0: low

  • 1: high

DutyCycle_PulseLength_1 … 4 (INP) #

Depending on the mode set, displays the measured duty cycle or the measured pulse length: 0 … 65 535.

Fpwm_PulseCount_1 … 4 (INP) #

Depending on the mode selected, displays the measured frequency or registered pulses: 0 … 2000.

AnalogInputLogicLevel_1 (INP) #

Displays if the switching threshold is exceeded.

  • 0: Switching threshold has not been exceeded.

  • 1: Switching threshold has been exceeded.

AnalogInput_1 … 8 (INP) #

Displays the voltage at analog input 1 … 8 in mV: 0 … 10 000

The input circuitry tolerates voltages up to 10.76 V. Voltages exceeding this value are internally limited to 10 760 mV and represented in the process image by the maximum value of 10 000 mV (= 10 V).

DigitalOutput_1 … 4 (OUT) #

Defines the level of the digital outputs:

  • 0: low

  • 1: high

PwmDutycycle_1 … 4 (OUT) #

Sets the duty cycle for the individual digital outputs: 0 … 999.

The duty cycle indicates the ratio between pulse duration and period duration for a periodic sequence of pulses.

AnalogOutputLogicLevel_1 … 8 (OUT) #

Defines the level of the analog outputs in LogicLevel mode:

AnalogOutput_1 … 8 (OUT) #

Sets the voltage for the output in mV: 0 … 10 000.

EncoderMode (MEM) #

Determines whether the digital I/O channels 3 and 4 are used as quad encoder input:

  • 0: no encoder

  • 1: use digital I/O channels 3 and 4 as encoders

The digital I/O channels 1 and 2 can continue to be used as an output with all modes or as an input (no PWM, no pulse).

IO_Mode_1 … 4 (MEM) #

Defines the operating mode for the respective digital input or output.

  • digitalIn: Connection is used as digital Input (level detection).

  • pulseIn: Connection is used as digital input for pulse measurement.

  • pwmIn: Connection is used as digital input for PWM measurement.

  • digitalOut: Connection is used as digital output (level output).

  • pulseOut: Connection is used as digital output to deliver pulses.

  • pwmOut: Connection is used as digital output for pulse width modulation.

See also: Examples: Configuring digital inputs and outputs on the RevPi MIO in PiCtory.

Pullup (MEM) #

Activates the pull-up resistors for the digital inputs. The value is a bitmask with one bit per input (bit 0 = digital input 1 … bit 3 = digital input 4):

  • 0: all pull-ups deactivated

  • A set bit: pull-up activated for that input

For example, 9 (binary 1001) enables the pull-ups on digital input 1 and 4.

PulseMode (MEM) #

Activates the retrigger mode:

  • 0: Single

  • 1: Retrigger

FpwmOut_12, 3, 4 (MEM) #

Defines the PWM frequency for the digital outputs: 0 … 65 535.

12 = PWM frequency for output 1 and 2; both always use the same frequency. Connections 3 and 4 can be configured separately.

Possible frequencies:

  • Output 1 and 2: 1 … 60 000 Hz

  • Output 3 and 4: 2 … 120 000 Hz

PulseLength_1 … 4 (MEM) #

Defines the pulse length at the respective digital output: 0 … 65 535.

AnalogInputMode_1 … 8 (MEM) #

Defines the mode for the analog inputs:

  • analogInput: voltage measurement

  • LogicLevelInput: level detection

InputLogicLevelVoltage_1 … 8 (MEM) #

Sets the switching threshold for level detection: 0 … 10 000.

FilterWindowSize (MEM) #

Sets the filter width of the moving average filter: 1 … 255.

Moving Average Filter

The RevPi MIO measures with 15 bits and delivers values from 0 to 10 000 mV.

The moving average filter averages several measured values to reduce noise.

This makes the signal more stable, but slower to react to rapid changes.

AnalogOutputMode_1 … 8 (MEM) #

Defines the mode for the outputs:

  • analogOutput: Use as an analog output, i.e. outputs provide a voltage between 0 … 10 V.

  • LogicLevelOutput: Use as a digital output, i.e. outputs provide a constant, preconfigured voltage. Logic level adjustable up to 10 V.

OutputLogicLevelVoltage_1 … 8 (MEM) #

Sets a fixed output voltage in mV for the LogicLevel mode: 0 … 10 000.

AnalogOutput must be unequal to 0 so that OutputLogicLevelVoltage is output.

Technical Data #

Item No.: 100323
NOTE: Technical data may vary depending on the product revision (see housing front).

Standard

EN 61131-2

Housing dimensions (H × W × D)

96 × 22.5 × 110.5 mm

Housing type

DIN rail housing for TH35 mounting rail according to DIN EN 60715

Housing material

Polycarbonate

Weight

Approx. 115 g

Protection class

IP20

Power supply

24 V DC (10.8 … 28.8 V DC)

Maximum power consumption

10 W (system)

Approved operating temperature

-20 … +55 °C

Approved storage temperature

-40 … +85 °C

Max. relative humidity (at 40 °C)

93 % (non-condensing)

Interfaces

  • 8 analog inputs

  • 8 analog outputs

  • 4 digital I/O channels, identically assigned and configurable collectively as either inputs or outputs

Analog Inputs

Measurement range

0 … 10 V DC[1]

Input impedance (until product revision 1.1)

> 900 kΩ

Input impedance (as of product revision 1.2)

20 kΩ

Max. overall input error

±0.3 % (of full-scale range)

Sample rate

8 ms / 125 Hz

Resolution

1 mV (process image)

Galvanic isolation 24 V supply

Only for product revision 1.1

Analog input modes

  • Analog Input

  • Logic Level Input

Analog Outputs

Output voltage

0 … 10 V DC

Max. output current

10 mA (10 V @ 1 kΩ)

Max. overall output error

±0.3 % (of full-scale range)

Data control rate

1 PiBridge cycle

Resolution

4.48 mV

Galvanic isolation 24 V supply

Only for product revision 1.1

Analog output modes

  • Analog Output

  • Logic Level Output

Digital Inputs/Outputs

Digital input [PIN IN] (until product revision 1.1)

Level detection (threshold 1 V)

Digital input [PIN IN] (as of product revision 1.2)

  • Type 3 inputs according to EN 61131-2

    • Threshold high → low: 7 V

    • Threshold low → high: 10 V

    • Input current 2.4 mA

Digital output [PIN OUT] (until product revision 1.1)

  • Uhigh = 22 V (with Ihigh <20 mA)

  • Feedback via digital input [PIN IN] (error message possible)

Digital output [PIN OUT] (as of product revision 1.2)

  • Uhigh = positive supply voltage, max. 200 mA

  • Short-circuit proof

  • Feedback via digital input [PIN IN] (error message possible)

Digital modes

  • Digital Input

  • Digital Output

  • PWM Input

  • PWM Output

  • Pulse Input

  • Pulse Output

  • Encoder Input

EMC interference emission (until product revision 1.1)

According to EN 61000-6-4 (industrial environments)

EMC interference emission (as of product revision 1.2)

According to EN 61000-6-3 (residential environments)

EMC immunity

According to EN 61000-6-2;
For cable lengths over 3 m, a shielded cable is required for the analog I/Os.

Optical display

3 status LEDs (bi-color)

Conformity

CE, RoHS
1. The input circuitry tolerates voltages up to 10.76 V. Voltages exceeding this value are internally limited to 10.76 V and represented in the process image by the maximum value of 10 000 mV (= 10 V).