Binary inputs: configuration and diagnosis. IFM CR0403

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BasicController CR0403

Binary inputs: configuration and diagnosis

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Configuration of each input is made via the application program:

• FB INPUT

(→ p. 171 ) > input MODE

MODE BYTE operating mode of the input channel:

0 = 0x00 off

3 = 0x03 voltage input

6 = 0x06 voltage input, ratiometric

7 = 0x07 current input

9 = 0x09 voltage input

10 = 0x0A

(only for analogue evaluated inputs) binary input, plus switching (BL)

0…10 000 mV

0...1 000 ‰

0…20 000 µA

0…32 000 mV

11 = 0x0B

(only for analogue evaluated inputs) binary input, plus switching (BL) with diagnosis

(Namur)

12 = 0x0C binary input, minus switching (BH)

18 = 0x12 resistance input 16...30 000 Ω

Activation of the input diagnosis

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If the diagnosis is to be used, it needs to be activated additionally.

► Set the mode of the input via input MODE of the function block INPUT

(→ p. 171 ).

> The FB INPUT (

→ p. 171 ) provides the diagnostic messages of the inputs on its RESULT output.

NAMUR diagnosis for binary signals of non-electronic switches:

► Equip the switch with an additional resistor connection!

Figure: non-electronic switch S at input Inn

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Sensors with diagnostic capabilities to NAMUR can be used on these inputs.

In this case, no additional resistor connection is required.

Fast inputs

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The devices dispose of fast counting/pulse inputs for an input frequency up to 30 kHz ( → data sheet).

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If, for example, mechanical switches are connected to these inputs, there may be faulty signals in the controller due to contact bouncing.

Appropriate function blocks are e.g.:

FASTCOUNT

(→ p. 167 )

Counter block for fast input pulses

INC_ENCODER

(→ p. 169 )

PERIOD

(→ p. 173 )

Up/down counter function for the evaluation of encoders

Measures the frequency and the cycle period (cycle time) in [µs] at the indicated channel

When using these units, the parameterised inputs and outputs are automatically configured, so the programmer of the application does not have to do this.

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BasicController CR0403

Use as binary inputs

The permissible high input frequencies also ensure the detection of faulty signals, e.g. bouncing contacts of mechanical switches.

► If required, suppress the faulty signals in the application program!

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