Siemens SIMATIC FM 351 Manual page 162

Technical Specifications
Distance measurement
Signal voltages
Input frequency and cord length for asymmetrical
incremental encoder with 5 V supply
Input frequency and cord length for asymmetrical
incremental encoder with 24 V supply
Input frequency and cord length for asymmetrical
incremental encoder with 24 V supply
Data transfer rate and cord length for absolute
encoders
Monitoring possible for absolute encoders
Input signals
Number of digital inputs
Number of simultaneously controllable digital inputs 8
Electrical isolation
Status indication
Input voltage
Input current
Input delay (1I0, 1I1, 1I2 and 2I0, 2I1, 2I2)
Input delay (1I3 and 2I3)
Connection of a 2-wire BERO
Cable length unshielded (1I0, 1I1, 1I2 and 2I0, 2I1,
2I2)
Cable length shielded (1I0, 1I1, 1I2 and 2I0, 2I1,
2I2)
Cable length shielded (1I3 and 2I3)
Insulation test
A-4
Encoder inputs
Incremental
Absolute
Symmetrical inputs: 5 V to RS 422
Asymmetrical inputs: 24 V/ typ. 4 mA
Max. 400 KHz for 32 m shielded cord length
Max. 400 KHz for 100 m shielded cord length
Max. 50 KHz for 25 m shielded cable length
Max. 25 KHz for 100 m shielded cord length
Max. 188 KHz for 200 m shielded cord length
Max. 375 KHz for 100 m shielded cord length
Max. 750 KHz for 40 m shielded cord length
Max. 1,5 MHz for 12 m shielded cord length
No
Incremental: 2 pulse trains, 90 offset, 1 zero
pulse
Absolute: Absolute value
Digital inputs
8
yes, optocoupler
yes, green LED per digital input
0 signal: -3 ... 5V
1 signal: 11 V to 30 V
0 signal: 2 mA (closed-circuit current)
1 signal: 6 mA
0 1 signal: Typ. 3 ms
1 0 signal: Typ. 3 ms
1 signal: Typ. 300 µs
0
0 signal: Typ. 300 µs
1
Possible
100 m
max. 600 m
max. 100 m
VDE 0160
Digital outputs
FM 351 Positioning Module
C79000-G7076-C351-02