HEIDENHAIN ITNC 530 - Encoder Interface; Position Encoders

July 2010 18 – 277
18 Encoder Interface
18.1 Position Encoders
18.1.1 Introduction
Position encoders are also referred to as linear encoders.
They report positions and movements of the machine to the control.
iTNC 530 operates with incremental and absolute encoders.
Encoders with one reference mark or distance-coded reference marks and with EnDat interface
are permissible.
Encoders and scale tapes (e.g., LF, LC, LS, LB) are linear position encoders.
Angle encoders (e.g., RCN, RON, ROD, ERP, ERA) are rotational position encoders.
Position encoder
inputs
For example, scales for linear axes or angular encoders for rotary axes/spindles can be
connected here.
Monitoring of the
position encoders
The monitoring functions for the position encoders are activated in MP 20.x .
The following criteria are checked:
Note
On machines with digital axes and spindles that are not equipped with position encoders,
the position is captured via motor encoders.
See “Speed Encoders” on page 18 – 293.
MC 420 MC 422 (B/C) CC 424 (B)
 X1 to X5  X1 to X6
 X35 to X38
(depending on the expansion
stages)
 X201 to X206
 X207 to X214
(depending on the expansion
stages)
Criterion Error message
Absolute position with distance-coded
reference marks
Position encoder <AXIS> DEFECTIVE
Amplitude of encoder signals Position encoder AMPLITUDE TOO LOW <AXIS>
Edge separation of encoder-signals Position encoder <AXIS>: FREQUENCY TOO HIGH
DANGER
The monitoring functions for the position encoders (MP 20.x) must always be active!
Safe machine operation is not ensured without these monitoring functions.
Exception:
MP 20.0 is only active for position encoders with distance-coded reference marks.