Heidenhain Service Manual Itnc - HEIDENHAIN iTNC 530 Service Manual

External reference If the reference mark of the encoder cannot be used, e.g. owing to an unfavorable transmission
pulse of motor and rotary axis, an external reference pulse may be evaluated.
 In MP 4130.x a fast PLC input is defined for an external reference pulse.
 In MP 1360.x the number of the fast PLC input is entered for the axis concerned.
 MP 1350.x = 6 for the axis concerned.
Reference end To prevent the axes from violating their traverse limits when traversing the reference marks,
position each axis requires a trip dog (at the reference end position). The trip dogs must be installed by
the machine tool builder at the ends of the traverse range. The switch signals from the trip dogs
are sent to free PLC inputs. The PLC program must gate these PLC inputs with W1054 for
"reference end position."
Encoders with Encoders with EnDat interface can be connected to the position and speed inputs of the MC 422
EnDat interface and CC 422. With these encoders there is no need to traverse the reference marks. The position
value is only read when the control is switched on. It cannot be read again.
When connecting a position encoder with an EnDat interface:
 MP1350.x = 5 for the axis concerned
When connecting a speed encoder with an EnDat interface:
 The iTNC automatically attempts to communicate with the encoder.
When connecting a speed encoder with an EnDat interface as a position encoder:

MP1350.x = 5 for the axis concerned
 MP110.x = 0 for the axis concerned
If a position encoder without EnDat interface is used together with a speed encoder with EnDat
interface, the absolute position of the speed encoder can be evaluated instead of traversing the
reference mark of the position encoder.
 For this purpose the corresponding bit in MP1355 is set to 1 for those axes for which
the absolute position is to be evaluated via the speed encoder.
 If MP1356.x contains a wrong distance of position and speed encoder, the message
Set MP1356.x to <value> is displayed. Enter this value in MP1356.x.
MP960.x
Input:
MP1320
Format:
Input:
MP1330.x
Input:
14 – 218
Note
If use of multiturn encoders with EnDat interfaces results in overruns, the
corresponding information is entered in the system file NCDATA.SYS. For
a control exchange, this file must be transferred or MP960.x must be
readjusted.
Machine Datum
-99,999.9999 to +99,999.999 [mm] or [°]
Values with respect to the scale reference point.
Direction for traversing the reference marks
%xxxxxxxxxxxxxx
Bits 0 to 13 correspond to axes 1 to 14.
0: Positive
1: Negative
Velocity for traversing the reference marks
80 to 300,000 [mm/min]

HEIDENHAIN Service Manual iTNC 530