Troubleshooting – Comtrol PROFINET IO User Manual
Page 17
DeviceMaster UP PROFINET IO Installation Quick Start
2000484 Rev. E 17
Troubleshooting
Troubleshooting
You can refer to the following information to troubleshoot problems. In addition, you may want to refer to the
.
Issue
Possible Corrective Action
What are the slot numbers for
serial and Ethernet input and
output?
Use the slot number to determine whether the input and output is for a serial port
or a TCP/IP port. Serial input is received in Slot 1, serial output is sent through Slot
11, TCP/IP input is received in Slot 21 and TCP/IP output is sent through Slot 31.
This will eventually allow us to handle I/O for Ports 2‐4 in Slot 2, 3 and 4 or there
corresponding ports in the 10s, 20s and 30s range.
What if the system fault light is
on?
•
Look at the hardware diagnostics for the CPU that the DeviceMaster UP should
be connected to.
•
Examine any faults and take corrective action.
•
Ensure that your device is assigned the correct PROFINET IO Device Name
using HW Config.
•
Ensure that all the components are properly plugged in and powered on.
What if I never see data
appearing in PLC Input
memory?
•
Verify that there are no faults having to do with the DeviceMaster UP.
•
Verify that the PLC is in RUN mode.
•
Verify that you are looking at the correct Input address as assigned in the HW
Config
tool.
What if after writing data to
output memory it doesn't
appear?
•
Verify that you are writing to the Output Memory address you configured in
HW Config
.
•
Verify that you are setting the Sequence Number and Length fields correctly in
the Output Memory.
The DeviceMaster UP Output Memory begins with two WORD values; a 16‐bit
Sequence Number and 16‐bit Length field at the beginning of every “packet” of
serial or Ethernet data. The sequence number allows you to control when a new
packet is sent by incrementing the outgoing sequence number. See Step
in
Configuring Read/Write Devices
•
Verify that no system faults are occurring on PLC or DeviceMaster UP.
What if I miss some data from
the PLC – i.e. it never seems to
arrive?
PNIO is a cyclic I/O protocol. That is, data is exchanged between the PLC and the
DeviceMaster UP every N milliseconds. The frequency of the update is controlled (as
with all PNIO devices) in the IO Cycle tab of the Properties window for the
DeviceMaster UP. This is accessed by double‐clicking on the device in the HW
Config
application from within Step7. Update rates from 8ms to 512ms are available
in power of two increments.
•
If you are not getting the information from the serial device soon enough, you
may have the update rate configured to be too slow in the HW Config.
•
Is the connection dropping? Verify that you are not seeing system faults in the
history.
I can't find the DeviceMaster UP
device in HW Config!
It should be under PROFINET IO – Additional Field Devices – Gateway. If it is not
there, try reinstalling the GSDML file.