CARLO GAVAZZI CA18 Manuel D'instructions page 7

2.3 Operating modes
IO-Link capacitive sensors are provided with two switching output (SO) and can operate in two
different modes: SIO mode (standard I/O mode) or IO-Link mode.
2.3.1 SIO mode
When the sensor operates in SIO mode (default), an IO-Link master is not required. The device works
as a standard capacitive sensor, and it can be operated via a fieldbus device or a controller (e.g.
a PLC) when connected to its PNP, NPN or push-pull digital inputs (standard I/O port). One of the
greatest benefits of these capacitive sensors is the possibility to configure them via an IO-Link master
and then, once disconnected they will keep the last parameters and configuration settings. In this
way it is possible, for example, to configure the outputs of the sensor individually as a PNP, NPN or
push-pull, or to add timer functions such as T-on and T-off delays or logic functions and thereby satisfy
several application requirements with the same sensor.
2.3.2 IO-Link mode
IO-Link is a standardized IO technology that is recognized worldwide as an international standard (IEC
61131-9).
It is today considered as the "USB interface" for sensors and actuators in the industrial automation
environment.
When the sensor is connected to one IO-Link port, the IO-Link master sends a wakeup request (wake
up pulse) to the sensor, which automatically switches to IO-Link mode: point-to-point bidirectional
communication then starts automatically between the master and the sensor.
IO-Link communication requires only standard 3-wire unshielded cable with a maximum length of 20 m.
1
2
3
IO-Link communication takes place with a 24 V pulse modulation, standard UART protocol via the
switching and communication cable (combined switching status and data channel C/Q) PIN 4 or
black wire.
For instance, an M12 4-pin male connector has:
• Positive power supply: pin 1, brown
• Negative power supply: pin 3, blue
• Digital output 1: pin 4, black
• Digital output 2: pin 2, white
The transmission rate of CA18CA...IO or CA30CA...IO, sensors is 38.4 kBaud (COM2).
Once connected to the IO-Link port, the master has remote access to all the parameters of the sensor
and to advanced functionalities, allowing the settings and configuration to be changed during
operation, and enabling diagnostic functions, such as temperature warnings, temperature alarms and
process data.
L+
C/Q
4
L-
Rev.00 - 06.2018 | CA18/CA30 Capacitve sensors with IO-Link interface | © 2018 | CARLO GAVAZZI Industri
IO-Link
SIO
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