ABB 888-2, Applications Manual

Page: 69 / 88

7 Troubleshooting
7.1 Scenarios
Problem assigning IP address or station name
If an external PROFINET configuration tool is used to set IP address or station
name for a controller or device, it may not be possible to perform that operation.
In such a case, make sure that the device or PLC is not involved in any I/O data
exchange. If, for example, a device or PLC is exchanging data with another device
or PLC, it is not possible to change the IP address or station name of those devices.
Unable to connect to a device
If all parameters are correct, but it is still not possible to connect to an device using
the PROFINET controller, make sure that the device does not already have an
active connection with another controller. Most I/O devices do not accept that two
controllers are connected against the same I/O device at the same time. That is,
if the device does not allow shared device functionality.
Connections are lost randomly
Lost connections can occur for a number of reasons.
• Bad network
• Overloaded Ethernet switches
• Ethernet cable problems
Another possible reason is that the IRC5 PROFINET is not able to process all the
PROFINET requests within the specified time frame. If, for example, 20 I/O devices
are used with 1 ms reduction ratio (poll rate), the slightest variation of CPU load
on the main computer might cause a protocol disturbance which can lead to a
connection timeout. The maximum possible devices that can be used depends on
the reduction ratios used, CPU load and data lengths transferred at every data
cycle.
There can be connection loss while configuring PROFINET Master on the same
logical subnet as other applications, on the WAN port. It might cause sporadic loss
of communication for the applications as well as for the PROFINET communication.
Poor performance using fast startup
In general the startup time for one I/O device using fast startup is less than a
second, together with the robot controller. This is highly dependent upon the device
itself. Check with the device vendor for detailed description about I/O devices that
support fast startup with corresponding performance figures.
• If there are other intermediate hardware on the connection link that might
interfere with the PROFINET connection.
• If there is a chained setup containing multiple devices, there is an increased
latency before all devices are running. Depending upon the number of chained
devices the total connection time can be more than a second.
Continues on next page
Application manual - PROFINET Controller/Device 69
3HAC050969-001 Revision: G
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7 Troubleshooting
7.1 Scenarios