Configuring Digital I/O Modules

CODESYS helps you to configure your RevPi DIO/DI/DO.

    • Double-click on RevPi DIO/DI/DO in the CODESYS device tree.
    • Navigate to the first tab Module Parameters.
    • Set the desired values in the Value column.

Configuration values of the RevPi DIO

Configuration values of the RevPi DO

Configuration values of the RevPi DI

Description of the configurable values of RevPi DIO/DI/DO

In the following you will find a detailed description of the areas Inputs, Outputs, Memory, Counter, Encoder and PWM.

Input

In the input area you can make settings for all parameters your RevPi module receives, e.g. values of a temperature sensor.

Name

Data type

Number

Offset

RevPi DIO

RevPi DI

RevPi DO

Description

Input

WORD

1

0

X

X

Current values at the inputs.

Bits 0 – 15 (DI) or 0-13 (DIO) show the current values of inputs 1 – 16 (DI) or 1-14 (DIO).

Output Status

WORD

1

2

X

X

Bit-coded status of the outputs.

Bits 0 – 15 (DO) or 0-13 (DIO) indicate the current error state of outputs 1 – 16 (DO) or 1-14 (DIO).

1: Output error (Switch-off due to overtemperature, overload..).

0: no error

Status

WORD

1

4

X

X

X

Module status

NOTE: Values of bit 0-7 are valid only for RevPi DIO and DI. These bits are not assigned for RevPi DO, since this module has no input ICs.

Bit 0: No communication to the input IC.

Bit 1: UV1* on input 1 – 8

Bit 2: UV2* on input 1 – 8

Bit 3: Overtemperature** on input 1 – 8

Bit 4: UV1* on input 9 – 16

Bit 5: UV2* on input 9 – 16

Bit 6: Overtemperature** on input 9 – 16

Bit 7: Error prompt of the input IC

NOTE: Values of bit 8-16 are valid only for RevPi DIO and DO. For RevPi DI, these bits are not occupied because the module has no output ICs.

Bit 8: No communication to the output IC.

Bit 9: CRC error on output IC.

Bit 10: Error message of the output IC.

Bit 11 – 15: undefined

Counter

DINT

16

6

X

X

Current values of the counter or encoder function.

UV1: The supply voltage for the input ICs has dropped below 7 volts. The alarm is canceled when the supply voltage rises above 9 volts again.

UV2: The supply voltage for the input ICs has dropped below 14 volts. The alarm is canceled when the supply voltage rises above 16.5 volts again.

Channels 1-8 and 9-16 have separate bits for UV1 and UV 2 because there are two individual ICs in the module that generate this signal. However, the voltage is always identical on both ICs. Therefore, both ICs set their error bit in UV1 or UV2.

** The input ICs signal an overtemperature alarm when 135 °C is exceeded.

Output

In the output section you can configure settings for all process values sent by your RevPi module.

Name

Data type

Number

Offset

RevPi DIO

RevPi DI

RevPi DO

Description

Output

WORD

1

70

X

X

Current values at the outputs.

Bits 0 – 15 (DO) or 0-13 (DIO) indicate the current values of outputs 1 – 16 (DO) or 1-14 (DIO).

PWM
(1 – 16)

USINT

16

72

X

X

Current PWM values in % for outputs 1 – 16 (DO) or 1-14 (DIO).
These values are only valid if the PWM function is enabed for the respective output.

Memory

In the Memory area you can define how the individual inputs are to be evaluated and how the outputs are to be set.

Name

Data type

Number

Offset

RevPi DIO

RevPi DI

RevPi DO

Description

InputMode

BYTE

16

88

X

X

Select the mode for each input.

Direct: The current value of the input can be retrieved.

Counter, rising edge: Rising edges are counted at the input.

Counter, falling edge: Falling edges are counted at the input.

Encoder: This input is used for encoder function.

NOTE: Two inputs required for encoder function (see section „Encoder“).

InputDebounce

WORD

1

104

x

x

This is where a time for the debounce filter is specified for all inputs. This time indicates when a changing state at the input is considered stable. Possible values are Off, 25 µs, 750 µs and 3 ms.

OutputPushPull

WORD

1

106

X

X

Specifies whether the outputs are operated in push-pull or highside mode.

OutputOpenLoadDetect

WORD

1

108

X

X

Specifies whether open-load detection is enabled for the outputs.

OutputPWMActive

WORD

1

110

X

X

Specifies whether PWM is enabled for the outputs.

OutputPWMFrequency

BYTE

1

112

X

X

This is where, for all outputs that are to be operated in PWM mode, the frequency at which the PWM signal is to be generated is specified. In general: The higher the frequency, the higher the step size in which the clock ratio can be set.

Counter

You can optionally switch on a counter function for each of the 14 inputs. You can, for example, count the number of times a turnstile or a key has been pressed.

You can find an example of this in our video tutorials.

For each counter, a 32 bit value is then available in the process image.

The current counter value is returned as signed 32 bit value.

Encoder

You can configure all inputs as encoders. The PWM function is helpful if you want to, e.g., control parts of quantities. You can use it to regulate a water supply or dim lights.

You can use a maximum of five encoders.

For each encoder you need two inputs. You must always use the inputs in pairs, e.g.:

Input 1 and 2,

Input 3 and 4

Input 13 and 14 (or input 15 and 16 for RevPi DI)

It is important that you always apply the first encoder channel to an odd input. Otherwise your encoder will not be recognized.

The current encoder value is returned as signed 32 bit value for the first channel.

PWM

You can switch on an optional PWM function for each of the 14 outputs.

The PWM function is helpful if you want to, e.g., control parts of quantities. You can use it to regulate a water supply or dim lights.

If PWM is switched on, a whole byte value from 0 to 100 is transmitted instead of one bit per channel, which defines the pulse width at the output as a percentage. By configuration, one of the following PWM frequencies can be set for each module:

PWM frequency

Resolution of the smallest increment in percent (step size)

40 Hz

1 %

80 Hz

2 %

160 Hz

4 %

200 Hz

5 %

400 Hz

10 %

The current step size in % is set via an unsigned 8 bit value.