System Integration; Basic Knowledge About Io-Link; Advantages Of Io-Link; Digital Point-To-Point Connection - Balluff BIS U-4A7-082-01C-07-S4 Betriebsanleitung

BIS U-4A7-082- _1C-07-S4
Industrial RFID system - Read/write head
8

System integration

8.1

Basic knowledge about IO-Link

8.1.1

Advantages of IO-Link

IO-Link offers the following advantages:
– Uniform and simple wiring of different devices
– Change of device parameters by the controlling system
possible
– Remote retrieval of diagnostic information possible
– Central data storage of device parameters possible
In addition to the pure process data, the manufacturer-
independent standard IO-Link transmits all relevant
parameter and diagnostic data of the process level via a
simple standard cable. Communication is based on a
standard UART protocol with 24 V pulse modulation. A
separate power supply is not necessary.
The BIS U-4A7-IO-Link device uses three-wire technology
and operates at a transmission rate of 230400 bit/s
(COM3). The data quantity of the process data is 32 bytes
per direction (see chapter 8.5 on page 39).
8.1.2

Digital point-to-point connection

IO-Link integrates conventional and intelligent actuators
and sensors in automation systems. Mixed operation of
conventional and intelligent devices is possible without
additional effort.
IO-Link is intended as a communication standard below
the classic fieldbuses. The fieldbus-independent IO-Link
data can be transmitted at the higher level via the existing
communication systems (fieldbuses or Ethernet-based
systems).
IO-Link devices can transmit application-specific
parameters and data (e.g. diagnostic data) via a serial
communication method. Flexible telegram lengths are
possible in order to be able to transfer extensive amounts
of data. Communication is based on a standard UART
protocol with 24 V pulse modulation. Only one data line is
used for communication, via which both the controller and
the device telegram are transmitted. This allows classic
three-conductor physics.
26 english
Three-wire physics
IO-Link supports both communication mode and standard
IO (SIO) mode. Standard IO provides a switching signal on
the communication line, as used by simple switching
sensors. This mode is only possible with devices that use
three-wire connection technology (see Fig. 8-1). SIO mode
is not supported by BIS U M-IO-Link devices.
L+
1
Q/C
2 4
3
L-
Fig. 8-1: Three-wire physics of the IO-Link
Communication operation
The BIS U-4A7-IO-Link device operates in communication
mode with frame type 2. With this transmission type, up to
32 bytes of process data in both directions and 2 bytes of
requirement data are transmitted per frame (data block).
Process data is the application-specific data, while
requirement data can contain parameters, service or
diagnostic data.
IO-Link
Standard IO