Baumer GCMMW Manual - Page 41

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Baumer GCMMW Manual
8.3.2.

No encoder communication (LED flashing red once per second)

Incorrect encoder parameterization, i.e. one of the programmed values is outside the limits.
Typically, during re-parameterization of the encoder resolution (steps per revolution, measuring units per
revolution") the encoder's total measuring range was not adapted correspondingly.
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 the same as in parameter
"measuring units per revolution".
Multiturn encoders
Multiturn encoders are capable of sensing max. 65536 revolutions (multivoPlus even 8192 revolutions).
Maximum admissible value for the total measuring range is the result of "steps per revolution" multiplied by
the encoder's maximum number of revolutions (65536 respectively 8192). Once this value is exceeded in the
parameterization this will result in an error signal (flashing LED) together with a "parameterization alarm" in
the diagnostic data.
Any other, inferior value may be programmed as total measuring range. All encoders with PROFIBUS bus
covers provide integrated endless operation ensuring admissible values for all resolutions and total
measuring ranges even during overrun.
Integer relations of singleturn resolution and total measuring range are not mandatory, as sometimes required
by other manufacturers.
Example:
The standard multiturn encoder GXMMW provides a 13 bit (8192 steps per revolution) singleturn
resolution 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 / revolution.
Total measuring range now only 3.600 x 65.536 = 235.929.600 steps.
If the total measuring range was not correspondingly adapted to this new maximum value, the encoder
would have to count 149.130 completed turns. That is impossible, and as a result there will be an error
signal (flashing LED) and a „parameterization error" in the diagnostic data.

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Baumer IVO GmbH & Co. KG
Villingen-Schwenningen, Germany