Received data compensating device

A communication master unit of a programmable controller having a compensating device for a received data at an output side, the compensating device comprising:

• a plurality of preprocessing units provided in parallel with each other on an output side of the receiver circuit each preprocessing unit having a filtering function and a sampling function with different characteristics from each other;
• a plurality of check units each provided on an output side of the preprocessing unit and serving to execute a reliability check of the data in accordance with a frame format of a protocol;
• a plurality of buffer units each provided on an output side of the check unit and serving to store the data processed by the check unit;
• and
• a data selector for monitoring a plurality of check results in the check units and selecting and outputting data from the buffer units having a check result of OK.

A slave unit of a programmable controller having a compensating device for received data on an output side of a receiver circuit in a physical layer, the compensating device comprising:

• a plurality of preprocessing units provided in parallel with each other on an output side of the receiver circuit each preprocessing unit having a filtering function and a sampling function with different characteristics from each other;
• a plurality of check units each provided on an output side of the preprocessing unit and serving to execute a reliability check of the data in accordance with a frame format of a protocol;
• a plurality of buffer units each provided on an output side of the check unit and serving to store the data processed by the check unit;
• and
• a data selector for monitoring a plurality of check results in the check units and selecting and outputting data from the buffer units having a check result of OK.

A repeater to be connected to an upper side communication line and/or a lower side communication line having a compensating device for a received data on an output side of a receiver circuit in a physical layer for each line, the compensating device comprising;

• a plurality of preprocessing units provided in parallel with each other on an output side of the receiver circuit each preprocessing unit having a filtering function and a sampling function with different characteristics from each other;
• a plurality of check units each provided on an output side of the preprocessing unit and serving to execute a reliability check of the data in accordance with a frame format of a protocol;
• a plurality of buffer units each provided on an output side of the check unit and serving to store the data processed by the check unit;
• and
• a data selector for monitoring a plurality of check results in the check units and selecting and outputting data from the buffer units having a check result of OK.