Siemens SIMATIC FM 453 Manual page 50

Wiring the FM 453
Encoder Power The 5 V or 24 V power supply to the encoders is generated within the module
Supply
and is available on the female sub-D connector, and so you can power the
encoders by way of the connecting cable, without additional wiring. The
available voltage is electronically protected against shorting and thermal
overload, and is monitored.
Table 4-8
5 V power supply
Voltage
Ripple
Current carrying capacity per channel
24 V power supply
Voltage
Ripple
Current carrying capacity per channel
Connecting Cables
The maximum cable length depends on the specifications of the encoder
to Encoder
power supply, and on the transfer frequency. For trouble-free operation, you
should not exceed the following values when using SIEMENS cable sets:
Table 4-9
Note
If you want to use incremental encoders with cable lengths longer than 25 or
35 m (82 or 115 ft), select a type that uses a 24 V power supply.
Table 4-10
Incremental encoder Incremental encoder
Absolute encoder (SSI) Absolute encoder (SSI)
4-18
Electrical Parameters of Encoder Power Supply
Parameters
Cable Length as a Function of Encoder Power Supply
Supply Voltage
Tolerance
5 V DC 4.75 V to 5.25 V
5 V DC 4.75 V to 5.25 V
24 V DC 20.4 V to 28.8 V
24 V DC 11 V to 30 V
Cable Length as a Function of Transfer Frequency
Encoder Type
FM 453 Servo Drive / Step Drive Positioning Module
Min Max
5.1 5.3
50
0.3
20.4 28.8
3.6
0.3
Power Max. Cable
Consumption
< 300 mA 25 m (82 ft)
< 210 mA 35 m (115 ft)
< 300 mA 100 m (328 ft)
< 300 mA
Frequency Max. Cable Length
1 MHz 10 m (32.8 ft)
500 kHz 35 m (115 ft)
1.25 Mbps 10 m (32.8 ft)
156 kbps 250 m
C79000-G7076-C453-01
Unit
V
mV
ss
Q
V
V
ss
Q
Length
300 m