Configuring the Multi I/O Module - Industrial Raspberry Pi

CODESYS helps you to configure your RevPi MIO.

Double-click on RevPi MIO in the CODESYS device tree.
Navigate to the first tab Module Parameters.
Click on the corresponding cell in the column Value to set the values.

Configuring Digital Inputs and Outputs

The RevPi MIO has a GPIO interface with four connections, which you can use as an option in various operating modes:

PWM input
PWM output
Pulse measurements
Pulse output
GPO 24 V level output
GPI 24 V

The digital inputs and outputs use the same ground as the analog inputs and outputs. For this reason you should use one of the system ground connections on the 28-pin connector strip. If you don”t use this ground, it”s possible that your values will be distorted. If the voltage between the system ground and the ground of the digital inputs and outputs is too high, the protective diode can also be destroyed.

List of the Setting Values for the Digital Inputs and Outputs

Parameter	Values	Function
DigitalInput_1-4	0: low 1: high	The value indicates which level is present at the input.
Dutycycle_Pulselength _1-4	0-65535	This value indicates the measured duty cycle or the measured pulse length, depending on which mode is set.
Fpwm/PulseCount _1-4	0-65535	This value indicates the measured frequency or registered pulses, depending on which mode is set.
DigitalOutput_1-4	0: low 1: high	Here you can set the individual digital outputs to high or low.
PWM Dutycycle_1-4	0-1000	Here you can set the duty cycle* for the individual digital outputs. ^{*The duty cycle indicates the ratio between pulse duration and period duration for a periodic sequence of pulses.}
Encoder Mode	0 = No encoder 1 = Encoder on GPIO3&4	If you set the value 1 here, you can use GPIO3 and GPIO4 as a quad encoder input. GPIO1 and GPIO2 can continue to be used as an output with all modes or as an input (no PWM, no pulse).
IO_Mode_1-4	0 = Input Connection is used as digital output. 1 = PulseInput Connection is used as digital input for pulse measurement. 2 = Pwm-Input Connection is used as digital input for PWM measurement. 3 = Output Connection is used as digital output. 4 = Output-Pulse Connection is used as digital output to deliver pulses. 5 = Output-Pwm Connection is used as digital output for pulse width modulation.	Here you can define the operating mode for the respective digital input or output.
PulseMode	0 = Single 1 = Retrigger	Here you can activate retrigger mode.
FPWMOUT_12, 3,4	0-65535	12= PWM frequency for digital outputs 1 and 2. These two connections always share the same PWM frequency. Connections 3 and 4 can be configured separately.
PulseLength_1-4	0-65535	Pulse length on the respective digital output.

Configuring Analog Inputs

Your MIO has eight analog inputs. These inputs can be used as a voltage input. Here you can connect sensors such as proximity or level sensors with analog outputs. The maximum common mode voltage per input may be between 0 and 10 V.

To ensure your configuration works it’s important that your devices are connected to the right input pins.

List of the Setting Values for the Analog Inputs in CODESYS for MIO

summarized.

Parameter	Values	Function
AnalogInputMode 1-8	Analog input: Connection is used for voltage measurement. LogicLevelInput: Connection is used for level detection.	Here you can define whether you wish to use the respective connection for level detection or for voltage measurement.
AnalogInputLogicLevel_1-8	o: Switching threshold has not been exceeded. 1: Switching threshold has been exceeded.	This value indicates whether the switching threshold has been exceeded.
Analog Input 1-8	Logic 0-10000	Here you will see which input voltage is present at the respective analog input. The value is output in mV.
InputLogicLevelVoltage_1-8	0-10000	Here you can define the switching thresholds for the analog inputs.
FilterWindowSize	1-255	Filter width of the moving average filter.

Configuring Analog Outputs

In the following example we will configure the first analog output to use to output voltage. You need this mode in order to use actuators such as setting elements or final control elements for controllers for example. To do this you will need to set the following configuration parameter:

Using Analog Output to Output Voltage

AnalogOutputMode1 = Analog output

Analog Output 1 = Set the output voltage here. The value must be between 0 and 10000 and is stated in mV.

If you need more digital outputs, you can convert one of the analog outputs so that it behaves like a digital output. To do this you will need to set the following configuration parameter:

Using Analog Output as Digital Output

AnalogOutputMode1 = LogicLevelOutput

OutputLogicLevelVoltage 1 = Set a fixed output voltage here. The value must be between 0 and 10000 and is stated in mV.

AnalogOutputLogicLevel_1 = Here you can set the digital output to low (0) or high (1).

Parameter	Values	Function
AnalogOutputMode_1-8	analogOutput: You can use the connection as an analog output. LogicLevelOutput: You can use the connection as a digital output.	Set the function mode for the analog output here.
analogOutput 1-8	0-10000	Set the voltage that the respective analog output should deliver in mV here.
OutputLogicLevelVoltage 1-8	0-10000	Set a fixed voltage that the respective analog output should deliver in mV here. If a value other than 0 is entered for analogOutput_*, this is the voltage that will be delivered at the output.
AnalogOutputLogicLevel_1	o: low 1: high	If you are using the output as a digital output (function mode = LogicLevelOutput), here you can set the individual digital outputs to high or low.