Maximum Cable Length As A Function Of Encoder Power Supply; Maximum Cable Length As A Function Of Transfer Frequency - Siemens SIMATIC S7-300 Manual

Wiring the FM 354
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 4-7
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 4-8
Incremental encoder Incremental encoder
Absolute encoder (SSI) Absolute encoder (SSI)
4-10
Maximum cable length as a function of encoder power sup-
ply
Supply voltage Power consump-
tion
5 V DC < 300 mA
5 V DC < 220 mA
24 V DC < 300 mA

Maximum cable length as a function of transfer frequency

Encoder type
Max. cable length
25 m (82 ft)
35 m (115 ft)
100 m (328 ft)
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)
125 kbps 100 m (328 ft)
FM 354 Servo Drive Positioning Module