11 Technical Data
11.1 General Device Data
199
SICAM I/O Unit, 7XV5673, Device Manual
E50417-H1040-C484-A3, Edition 05.2012
Serial Interface
Termination of RS485 Bus (Terminal J)
Figure 11-1
Bus Termination of the RS485 Interface with Pullup/pulldown Resistors
The bus termination must be respectively carried out at the first and last RS485 device interface of the bus. No
terminating resistor may be used at all other devices in this line.
Siemens recommends the use of a bus termination plug with integrated (activatable) resistors in accordance
with Figure 11-1, for example plugs with 35°-cable outlet type 6ES7972-0BA42-0XA0 (see chapter 2.2). Use a
2-wired, twisted and shielded cable (see chapter 2.2). In case of outdoor mounting Siemens recommends a
RS485
SICAM I/O Unit 7XV5673-0JJ10-1AA1
Connection
Terminal side, 9 pin D-sub socket
Protocol/Operating mode
Modbus RTU
I/O mirror
Baud rate (adjustable)
Min. 1 200 bit/s
Max. 115 000 bit/s;
Default setting 19 200 bit/s
Min. 1 200 bit/s
Max. 187 500 bit/s;
Default setting 115 200 bit/s
Maximum distance of
transmission
Max. 1 km, three-wire line, twisted, shielded
Transmission level
Low: -5 V to -1.5 V
High: +5 V to +1.5 V
Reception level
Low:
≤
-0.2 V
High:
≥
+0.2 V
Bus termination
Not integrated, bus termination using plugs with integrated
bus terminating resistors (see Figure 11-1)
Optical
SICAM I/O Unit 7XV5673-0JJ20-1AA1
Connection
Terminal side,
ST connector plug, 820 nm
Bending radiuses: According to optical fiber cable used
Protocol/Operating mode
Modbus RTU
I/O mirror
Baud rate
Min. 1 200 bit/s
Max. 115 000 bit/s;
Default setting 19 200 bit/s
Min. 1 200 bit/s
Max. 187 500 bit/s;
Default setting 115 200 bit/s
Maximum distance of
transmission
Max. 2000 m at 62.5
μ
m/125
μ
m multimode optical fiber
Receiver sensitivity
-24 dBm at 62.5
μ
m/125
μ
m multimode optical fiber
Optical budget
Min. 8 dB at 62.5
μ
m/125
μ
m multimode optical fiber
DC +5 V
A
B
390
Ω
390
Ω
220
Ω
Bus termination
GND
MAN_SICAM_IO-Unit_7XV5673_US.book Page 199 Thursday, May 10, 2012 10:59 AM
