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7.3. FAQ: Troubleshooting
7.3.1. No encoder communication (LED yellow continuous)
The encoder connected is not recognized in the bus. Neither configuration nor parameterization has been
successful, reason why the LED remains yellow continuous.
This phenomenon may be due to the following reasons
•
No PROFINET connection or broken wire in the line.
•
The programmed device name does not correspond to the stored device name.
•
Incorrect encoder implementation in the PROFINET project, so it does not exist from the PLC’s point of
view
•
Correct encoder implementation in the PROFINET project, but inadvertently the compiled project has not
yet been exported to the PLC.
•
Should the above troubleshooting prove unsuccessful try to connect the encoder by the other port.
7.3.2. No encoder communication (LED flashing red once per second))
Incorrect encoder parameterization, i.e. one of the programmed parameters is outside the limits.
Most often when altering the encoder resolution (steps per turn, measuring units per revolution“) the
encoder’s total measuring range was not correspondingly aligned.
Singleturn encoders
The total measuring range of a singleturn encoder comprises exactly one complete or partial revolution,
reason why the value in parameter “total measuring range” must always be equal to the parameter
“measuring units per revolution”.
Multiturn encoders
Multiturn encoders are capable of sensing max. 65536 revolutions (GBxxx 8192 revolutions). Maximum
admissible limit for the total measuring range is the product of “steps per turn” multiplied by the encoder’s
maximum number of revolutions (65536 respectively 8192). Excess values in parameterization will result in
an error signal (flashing LED) together with a “parameterization alarm” in the diagnostic data.
However, any inferior value may be programmed. All encoders with PROFINET bus covers feature integrated
endless operation ensuring admissible values for all resolutions and total measuring ranges even during
overrun. Integer ratios of singleturn resolution and total measuring range are not mandatory, as sometimes
required by other manufacturers.
Example:
Standard multiturn encoder GXMMW features a singleturn resolution of 13 bit (8192 steps per turn) and is
capable of sensing 65536 completed revolutions.
Consequently the total measuring range is 8.192 x 65.536 = 536.870.912 steps.
The singleturn resolution is reduced to 3600 steps / turn.
The total measuring range now is reduced to 3.600 x 65.536 = 235.929.600 steps.
If the total measuring range is not correspondingly aligned to the new maximum limit, the encoder will
have to count 149.130 completed revolutions. That is impossible and results in an error signal (flashing
LED).
