Configuration of analog ports

Description

With the function Configuration of analog ports, the analog ports can be configured independently of each other. Each input port can function either as a voltage input or as a current input. The analog signal can be connected to either Pin 2 or Pin 4.

The analog outputs can functions as a voltage output or as a current output. The analog signal is provided always on Pin 2.

The modules support many standard input signal ranges see Configuration of analog ports - Input signal range. In some cases, an analog sensor has a higher linear output range than the nominal output range. For example, a sensor with an output of 0…10 V can generate a voltage between −0.5 V and 10.5 V. It outputs errors at a signal of < 0.5 V or > 10.5 V.

Nominal and measuring range

The selected nominal range is determined by the type of the connected sensor (e.g.: 0…10 V or 4…20 mA). For each configured nominal range, the module has under- control and over-control ranges, in which the sensors often issue error messages (signal value outside the nominal range).

The nominal range together with the under-control and over-control range forms the measuring range. The module supplies digitalized values in the measuring range.

Overflow/underflow range

In the overflow and underflow range, no AD conversion takes place; there the module supplies the maximum or minimum value as Digitalized Input Value Port X, and sets the associated status bits (underflow Port X, overflow Port X).

Example:

An input port is configured to a nominal range of − 10 … + 10 V. According to Configuration of analog ports - Nominal and measuring range this nominal range has a measuring range between − 11.759 V and +11.759 V.

The resolution is 16 bits and a signed value is selected as the data format.

Process Data

Also see section Process Data Profiles.

Process data bits for Underflow/Overflow Port 5-8

ISDU

Analog Mode

The Analog Mode parameter sets the type and range of the analog signal for each port. The subindex determines which port will be read/set.

The following values can be set:

The default value for all ports is: 0xFF, the ports are switched off.

Analog Port Pin Assignment

The Analog Port Pin Assignment parameter is used to assign the analog port signal to the pin.

The following values can be set:

The default value for all analog input ports is: 0x01, Single-ended mode at Pin 4. Signal at Pin 2 (referenced to Pin 3).

Safe States

In the Safe States Register the applied analog output signal can be defined for the case when the IO-Link Master sets the PDO (Process Data Output Valid) flag to invalid or if the IO-Link communication gets aborted.

The following values can be set:

The default value for all ports is: 0x03, the last valid output value will be kept.

System Commands

Events

There is an event code for underflow and as well as for overflow, independent of the port at which the events occurred. The exact source of the event can be taken from the process data.

If an event (for example, overflow) is active on one port (e.g. Port 0) and another port (e.g. Port 4) also reaches the overflow range, no new event is generated (because an event has already been sent and is active). The event disappears when all ports (in the example: Port 0 and Port 4) have left the overflow range.