Siemens SIPART DR21, Manual

Page: 44 / 242

2 Technical Description
2.6 Technical Data
Manual
44
SIPART DR21
C73000-B7476-C143-08
Supply voltage VP (5 V) 5 V -0.4 V/+0.2 V; short-circuit-proof
line lengths, per segment at 1.5 Mbit/s 200 m, see ET 200-Manual 6ES5 998-
3ES12 for further details
6DR2803-8C Serial interface
Transmittable signals RS 232, RS 485 or SIPART BUS *) shun-
table
Transmittable data Operating state, process variables, para-
meters and structure switches
Transmission procedure According to DIN 66258 A or B
Character format 10 bits (start bit, ASCII-characters with
7 bits, parity bit and stop bit)
Hamming-distance h 2 or 4
Data rate 300 to 9600 bit/s
Transmission Asynchronous, semiduplex
Addressable stations 32
Time monitoring of the data communication 1 s to 25 s or without
Electrical isolation between Rxd/Txd
and the controller
max. common mode voltage
Test voltage
50 V UC
500 V AC
RS 232 RS 485
Receiver input Rxd
Signal level 0
Signal level 1
1)
Input resistance
0 to +12 V
2)
-3 to -12 V
2)
13 k
Ω
U
A
> U
B
, +0.2 to +12 V
U
A
< U
B
, -0.2 to -12 V
12
Ω
Send output Txd
Signal level 0
Signal level 1
1)
+5 to +10 V
-5 to -10 V
U
A
> U
B
, +1.5 to +6 V
U
A
< U
B
, -1.5 to -6 V
Load resistance
≤
1.67 mA 54
Ω
1)
Signal status 1 is the rest status
2)
Input protected with 14 V Z-diode, higher voltages with current limiting to 50 mA possible.
Line capacitance and lengths
at 9600 bits/s
Line capacitance Reference values line lengths p
Ribbon cable without shield Round cable with shield
RS 232 point-
to-point
≤
2.5 nF 50 m 10 m
RS 485 bus
≤
250 nF 1,000 m 1,000 m
*)
SIPART bus operation is no longer possible!
The bus driver is no longer available!