July 2013 6.1 Control loops 613
EnDat 2.2 encoders Encoders with EnDat 2.2 interface can be operated without analog encoder
signals. The position is evaluated purely digitally via a serial data protocol.
For motor encoders with EnDat 2.2 interface, the control requires the
following values for calculating the signal period:
The controller unit assumes that the rotary encoder has only one line per
encoder revolution. Enter the following data:
M331.x: For each axis, enter the distance traversed per motor revolution.
MP332.x: Enter the value "1".
MP1054.x: For each axis, enter the distance traversed per motor revolution.
Enter the value "1" in the STR column (line count of the motor encoder) of the
motor table.
If the temperature signal of the EnDat2.2 encoder is transmitted via the
additional lines for a KTY in the cable to the speed input of the control, and not
via the EnDat2.2 protocol, this can be configured with MP2222 bit 2 = 1. If you
use an external temperature sensor, you always need to use a KTY84-130.
MP2222.x Bit 2 – Temperature signal from KTY input, and not from EnDat
2.2 protocol
Format: %xxxxxxxxxxxxxxxx
Input: 0: Inactive
1: Temperature signal from KTY input
Encoders with EnDat 2.2 interface do not supply any incremental signals.
Only a purely digital measured value is transferred to the control. The
number of increments per encoder revolution (MP332.x) must therefore be
set to the value "1".
Large input values in MP331.x and MP332.x cannot be read by the PLC!
HEIDENHAIN recommends:
The optimum manufacturing precision can only be attained with linear
encoders. A control without linear encoders finds the axis position through
the pitch of the ball screw. The problem is, the ball screw gets hot during
machining and expands. And the result is a position measurement that
deviates from the actual position, causing error. With linear encoders, the
control always determines the correct slide position. This means that your
machine positions its axes with constantly high precision.
More information is available on the Internet at:
http://www.heidenhain-shows-the-way.com
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