“Pass Over Reference Point” Mode Of Operation; Reference End Position; Encoders With Endat Interface - HEIDENHAIN iTNC 530 Technical Manual

"Pass Over
Reference Point"
mode of operation
Reference end
position
Encoders with
EnDat interface
6 – 100
The NC uses W272 to report the "Pass Over Reference Point" operating
mode to the PLC.
If you switch the operating mode before all reference marks are traversed, the
PASS OVER REFERENCE soft key prompts you traverse the remaining
reference marks. In W1032 the PLC receives the information as to which axes
have not yet been referenced.
In W1032, the bits for axes that are not to traverse the reference marks
(MP1340.x = 0) are reset.
In the NCMACRO.SYS file, after the code word RESETINIT= you can enter the
name (incl. path) of a macro that will be called when the Pass Over Reference
Point mode of operation is exited. If the NC macro is terminated once with
END PGM or M02, it will no longer be run when the Pass Over Reference
Point mode is called and exited.
To synchronize the current machine status and the look-ahead calculation with
an NC macro call,
To prevent the axes from violating their traverse limits when traversing the
reference marks, 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 EnDat interface can be connected to the position and speed
inputs of the MC 422 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:
7 Enter MP1350.x = 5.
When connecting a speed encoder with an EnDat interface:
7 The iTNC automatically attempts to communicate with the encoder.
When connecting a speed encoder with an EnDat interface as a position
encoder:
7 Enter MP1350.x = 5.
7
In MP110.x, enter 0 for the axis with EnDat interface of the speed encoder.
If the position encoder has no EnDat interface and the speed encoder does,
instead of traversing the reference marks of the position encoder, you can
evaluate the absolute position of the speed encoder:
7 For the axis in which the absolute position is to be evaluated over the speed
encoder, set the corresponding bit in MP1355 to 1
7
Run a control reset
7 If an incorrect distance between the position and speed encoder is entered
in MP1356.x, the message Set MP1356.x to <value> appears. Enter this
value in MP1356.x.
HEIDENHAIN Technical Manual iTNC 530