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5.2 Digital Input Channel

The following functions can be realized by means of the Digital

Input Channel:

 Digital status recording

 Frequency measurement

 Counter

 8 bit Graycode transducers, Type 4122 / 4123

 8 bit status input, with additional (external) module

The above mentioned functions are based on incremental

measurements except the digital status and Graycode record-

ing. Incremental measuring means to count while measuring.

Pulses are counted e.g. from wind speed sensors.

Furthermore it is possible to connect up to 6 sensors with a

serial 8 bit Graycode output to the COMBILOG 1022, e.g. wind

direction sensor type 4122 / 4123.

By means of an external module type 1025 8 bit status signals

can be measured at each input. This module converts the 8 bit

into a serial signal, and the COMBILOG will compose it to 1

byte again.

Hardware Manual COMBILOG 1022

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