Allen-Bradley RightSight 42EF Series User Manual page 14

42EF RightSight Sensor with IO-Link Overview
10
The response time of an IO-Link system might not be fast
IMPORTANT
enough for high-speed applications. In this case, it is
possible to monitor/configure the sensor through IO-Link
on pin four of the sensors while connecting pin two (if the
sensor offers a second output) of the sensor to a standard
input card.
Transmission Rates
Three communication rates are specified for the IO-Link device:
• COM 1 = 4.8 kbaud
• COM 2 = 38.4 kbaud
• COM 3 = 230.4 kbaud
An IO-Link device typically supports only one of the specified transmissions
rates, while the IO-Link V1.1 specifications requires an IO-Link master to
support all three communication rates (see Product Specifications for product
communication rate.).
Transmission Quality
The IO-Link communication system operates at a 24V level. If a transmission
fails, the frame is repeated two more times. If the transmission fails on the second
try, the IO-Link master recognizes a communication failure and signals it to the
controller.
Response Time of the I-O Link System
The device description file (IODD) of the device contains a value for the
minimum cycle time of the device. This value indicates the time intervals at
which the master addresses the device. The value has a large influence on the
response time. In addition, the master has an internal processing time that is
included in the calculation of the system response time.
Devices with different minimum cycle times can be configured on one master.
The response time differs accordingly for these devices. When configuring the
master, you can specify a fixed cycle time and the device-specific minimum cycle
time stored in the IODD. The master then addresses the device that is based on
this specification. The typical response time for a device therefore results from
the effective cycle time of the device and the typical internal processing time of
the master. (See Product Specifications for minimum product cycle time.)
Rockwell Automation Publication 42EF-UM001A-EN-P - September 2015