Date post: | 16-Apr-2017 |
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Engineering |
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An Introduction to IO-Link
Russell Smith
Balluff Limited
WHAT IS IO-LINK?
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not another bus system!
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point to point communications protocol from the fieldbus to the sensor and actuator level.
up t
o 2
0M
Pulse-width modulated 24V
Baud rates: 4.8 kBit/s (COM1), 38.4 kBit/s (COM2), 230,4 kBits/s (COM3)
Pin Signal Description
1 L + 24 Volt
2
3 L - 0 Volt
4 C / Q IO-Link
communication
+ switching signal
standard - IEC 61131-9 network neutral
an open standard
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IO-Link master … acts as a gateway between the IO-Link device and the higher level communication
system, such as a fieldbus (Profinet, EtherNet/IP, etc.) or a device-specific backplane bus.
IO-Link device … is the field device with communication capability: sensors, switching
devices, valve terminals, RFID devices, indicator lights, etc.
3-core unshielded standard cable – up to 20M long … is the standard interface between IO-Link master and device
IODD and engineering tool
… are used to configure and assign parameters to the IO-Link system and devices.
an IO-Link system generally consists of the following basic components:
IO-Link devices
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many different IO-Link devices are available.
IO-Link masters
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panel mounted unit
with terminals
IP67 field
I/O module
additional slice on
existing PLC
WHY IO-LINK?
easier handling of measurement devices
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traditionally
better
best
lower cost – no analogue card lower cost vs IE networked device less wiring effort
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low cost high density less addresses
low cost per I/O point – 136 I/O on one IP address
extensive diagnostics
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available on sensors/devices and sensor hubs troubleshoot problems quickly maximise up-time
• Short circuit – LED for each I/O port
• Short circuit does not impair the unit
• Sensor/actuator under voltage LED for each I/O port
extensive diagnostics:
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simplify valve manifold wiring
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reduced installation time reduced cost
extends communication
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ERP
MES
SCADA
PLC
Network
Sensors and Actuators
Enterprise Level
Control Level
Management Level
Plant Control Level
Field Level
Sensor / Actuator Level
HMI
parameterisation – std pressure sensor
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HMI
HMI HMI HMI HMI
Time consuming configuration of 10 – 15 Parameter. (e.g. upper/lower Pressure point, Hysteresis, Time – or Pressure window)
Machine Tools have often more than 10 Pressure sensors
Error prone due to manual entry
Very bad when Sensor failure / Sensor exchange (especially during night shift)
parameterisation – std pressure sensor
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Manual
configuration
parameterisation – std pressure sensor
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HMI
HMI
HMI
HMI
HMI integrated in sensor for set up
means additional cost.
Expensive high-pressure hydraulic
hoses
parameterisation – std pressure sensor
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machine tool
Additional cost for protective
housing for sensors in the machine
E.g. machine tool
parameterisation – pressure sensor with IO-Link
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PLC
Function-
blocks
Vendor_ID
Device_ID
Param1: 50bar
Param2: 100bar
Param3: 200ms
Step 1
Identify device
Step 3
Get Parameter Set
Step 2
Check identity
Step 4
Write Parameter
Set
parameterisation – pressure sensor with IO-Link
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sensor installed at point of measurement
no expensive measurement cables - use std un-shielded 3-wire standard cables
no protection case
no sensors with HMI but reliable parameterisation via controller and HMI of the machine
decentralised diagnostics for sensors
parameterisation – pressure sensor with IO-Link
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parameter server
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IO-Link V1.1 master
automated tool changes
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IO-Link inductive couplers for non-contact signal transmission
an i4.0 enabler
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ERP
MES
SCADA
PLC
Network
Sensors and Actuators
Enterprise Level
Control Level
Management Level
Plant Control Level
Field Level
Sensor / Actuator Level
unabated IO-Link success!
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HOW IO-LINK?
device configuration
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1. controller parameter storage –
parameterisation from the PLC using the
function block
2. IO-Link master ver 1.1 parameter server
3. PC storage with USB master
4. webserver entry with IO-Link master
5. Manual configuration
IO-Link master configuration
connect the master and install GSDML file drag and drop the relevant file
Drag the appropriate (process data length) IOL input / output byte from the catalogue and name & address the module
IO-Link master configuration
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THANKS FOR LISTENING!
Russell Smith
Product Marketing Manager Industrial Networking
+44 (0)777 331 7984
www.linkedin.com/in/russellsmithindustrymanager