Item No. 2 539 042, 3070901HO
Subject to technical modifications and improvements serving the progress of our devices.
Start-up procedure
Bus connection of the encoder
Data are transferred according to RS 485.
The EX-cable’s line parameters are as follows (standard values):
Working capacitance (pF/m)
120
Inductance (mH/km)0.65
Wire resistance (
Ω
/km)
< 38
Core diameter (mm)
0.8
Core cross section (mm
2
)
0.5
The EX connecting cable does not comply with PROFIBUS Line type A spe-
cification (see EN 50170).
Accordingly, the Baud rate and the length of the encoder drop line must
be reduced.
We recommend 1.5 MHz maximum Baud rate and 5 m maximum drop line
length.
The bus structure permits to connect and disconnect stations without inverse
operation, or to start up the system step by step.
On system start-up, the transmission rate (Baud rate) is fixed uniformly for
all bus devices by the SPS (Master).
Setting the device address
The DIP switches of the pressure-proofly encapsulated EX-encoder RX70 are
not accessible. Hence, only a DPM2 device (Class 2 Master) can set the device
address via the bus!
The device address may be set in a range from 1 up to 125.
Standard setting
delivered from factory:
D
De
evviicce
e a
ad
dd
drre
essss =
= 3
32
2
..
Connection diagram
No.
Signal
Description
1
rs
B OUT
Receive/Transmit Data-Positive (B)
gr
A OUT
Receive/Transmit Data-Negative (A)
1
ge
B IN
Receive/Transmit Data-Positive (B)
1
gn
A IN
Receive/Transmit Data-Negative (A)
br
VCC1
+5 V Signal output (P5V)
1
bl
GND1
Data Ground (M5V)
1
br( 0,5)
0 V
Supply voltage Ground (M24)
ws( 0,5)
10 ... 30 VDC
Supply vU
B
(P24)
Screen
Screen
Cable screen connected to housing
Terminal screw
for additional connection of an earth
conductor
Identification code (see identification plate)
Version
P
Absolute/Programmable
Mounting
K
Clamping
flange
Protection class
4
IP 64
Shaft
2
10 mm
Interface
D
PROFIBUS-DP
Connection
A
PVC cable axial
Code
B
Binary
Resolution
1)
0010
10 Bit (S)
0012
12 Bit (S)
0013
13 Bit (S)
0014
14 Bit (S)
1212
24 Bit (M)
1213
25 Bit (M)
1214
26 Bit (M)
1)
S = Singleturn, M = Multiturn with 4,096 (12 Bit) revolutions
R
R X
X 7
7 _
_ TT P
P /
E
E
K
K
4
4
•
2
2
TT
A
A
D
D
B
B
Output
T
RS 485
Supply
voltage
E
10 … 30 VDC
Dimensioned drawing
Dimensions in mm
RX 70 = Alu
RX 71 = Stainless steel
Installation instructions
Absolute Shaft Encoder
RX70TPRX /RX 71TP
with PROFIBUS-DP
Page 6/8
