Siemens SINUMERIK FM-NC Installation And Startup Manual page 170

6 Assigning Parameters to the Control and the PLC Program
6.10 Linear motors (1FN1 and 1FN3 motors)
6-170
Scanning head
Scale
Fig. 6-36 Calculating the count direction of Heidenhain measuring systems
2. Renishaw measuring systems (e.g. RGH22B)
The Renishaw RGH22B measuring system (graduations = 20 µm) has com-
patible connections with the Heidenhain products from serial number
G69289 onwards. The zero marker on earlier scanning head models cannot
be evaluated. Since the reference marker on the Renishaw RGH22B has a
direction-dependent position, encoder signals BID and DIR must be para-
meterized such that the reference marker is output in only one direction.
The direction (positive/negative) is dependent on the geometric configura-
tion on the machine and the reference point approach direction.
Table 6-24 Signal and pin assignments, routing on 1FN linear motor
Signal Cable Circular
color color connector connector
12-pin
BID black Pin 9
DIR orange Pin 7
+5 V brown Pin 12
0 V white Pin 10
The count direction of the measuring system is positive if the scanning head
moves in the direction of the outgoing cable in relation to the gold strip.
Scanning
Measuring system
head
Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ë Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì
Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì Ì
Fig. 6-37 Calculating the count direction of Renishaw measuring systems
Note
If the scanning head is mechanically coupled to the primary part, the
outgoing cable direction must be different. Otherwise invert the actual value!
SINUMERIK 840D Installation and Start-Up Guide (IAD) – 04.00 Edition
+
Connected to
+5 V
Reference marker in
both directions
Positive directions
 Siemens AG 2000 All Rights Reserved
04.00 04.00
03.96
Rating plate
0 V
Reference marker in
one direction
Negative direction
Gold strip