Siemens SIMATIC S5 Equipment Manual page 94

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After turning on, the synchronization LED of the respective channel lights up until the clock pulse
group has been transferred to the module. The parameterTB can be transferred in BCD code from
the programmable controller, following the example for parameter assignment.
By means of the standard function block, direct specification of the clock pulse groups is possible.
The parameters are transferred from the basic module to the parameter memory of the encoder
matching module.
In case of "power on" or "software-based reset" of the 1P 241, the number of TBs
is internally set to 35!
In case of wrong parameterization, the specified number of TBs is increased by
two. (Watch out when reading back or during process continuation!)
For the setting TB >24, the number of TBs is internally set to 35 and the
synchronization LED lights up.
With each power failure the 1P 241 requires new parameterization!
This is a condition for correct 1P 241 operation.
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Matching Module 4 for Absolute Encoders
7 – 3