Converter IO-Link sensor ‒ 4…20 mA
EIO104
7
The analogue signal in case of a fault can be set via the parameter [FOU].
4.2 Operating modes
As soon as these are connected, the device detects a large number of IO-Link devices from ifm
automatically.
There are 2 two operating modes in which the device can be used:
•
Plug&Play with standard process values.
•
Operation with user-defined process values.
4.2.1 Plug&Play
The device reads the IO-Link data of the connected IO-Link sensors by using the following default
settings:
•
Reading of the standard values from the process data flow of the sensor.
•
The process values are further processed in percent.
•
The measuring range of the sensor is unscaled, i.e. for each respective analogue output, the
measuring range reaches from ASPx (0 % = 4 mA) to AEPx (100 % = 20 mA).
4.2.2 User settings
The following settings can be made by means of a suitable parameter setting software:
•
Selection of the process value types (pressure, temperature etc.) that are output via OUT1 and
OUT2.
•
Changeover of the factory set percentage unit of measure to fixed units for the corresponding
process value types.
•
Scaling of the measuring range via the parameters [ASP] and [AEP].
Restricting the measuring range can be an advantage, e.g. if the sensor is replaced with a sensor
with another measuring range.
Requirements for a sensor replacement:
– [uni.x] must be set to unit of measure and not to percent.
– The newly installed sensor covers the physical measuring range of the application.
If the user does not scale the measuring range to suit the sensor, the analogue signal will be
exceeded too early or not at all according to the output characteristics
Ò
(Fig. 2).
A scaled measuring range does not enhance the resolution of the output signal.
Example:
A pressure sensor with a measuring range of 0...10 bar is used. The measuring range is scaled
to 2...8 bar.
When this sensor is replaced with another device with a measuring range of 0...25 bar, the
converter will still output analogue signals of 4…20 mA between 2…8 bar.
When replacing with a unit with a measuring range of 0...5 bar, the converter outputs analogue
signals of 4...14 mA between 2...5 bar.
4.3 IO-Link
This unit has two IO-Link communication interfaces.
M12 connector:
•
Output for analogue signals
•
Input for parameter setting using IO-Link software.
