Siemens SIMATIC FM 351 Installation Manual page 151

Current Consumption and Power
Supply of digital inputs and outputs
Encoder Inputs
Displacement measurement
Signal voltages
Input frequency and line length for symmetrical encoder
with 5 V supply
Input frequency and line length for symmetrical encoder
with 24 V supply
Input frequency and line length for asymmetrical encoder
with 24 V supply
Data transfer rate and line length for absolute encoders
Monitoring possible for absolute encoders
Input signals
Digital Inputs and Outputs
Shielded line length
Load voltage reverse polarity protection
Status indication
Digital Inputs
Number of inputs
Number of simultaneously controllable digital inputs
Electrical isolation
Input voltage
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
Technical Specifications
Supply voltage: 24 VDC
(permissible range: 20.4 to 28.8 V)
Current consumption from 2L+ (without load):
Max. 50 mA (X1, Terminal 19)
Permissible potential difference between input
ground connection 1M (X1, Terminal 2)
– and the central grounding point (shield): 60
VAC; 75 VDC
– Insulation tested with 500 VDC
Permissible potential difference between input
ground connection 2M (X1, Terminal 20)
– and the central grounding point (shield):
60 VAC; 75 VDC
– Insulation tested with 500 VDC
Incremental
Absolute
Symmetrical inputs: 5 V to RS 422
Asymmetrical inputs: 24 V/typ. 4 mA
Max. 500 KHz for 32 m shielded line length
Max. 500 KHz for 100 m shielded line length
Max. 50 KHz for 25 m shielded line length
Max. 25 KHz for 100 m shielded line length
Max. 250 KHz for 160 m shielded line length
Max. 500 KHz for 60 m shielded line length
Max. 1 MHz for 20 m shielded line length
No
Incremental: 2 pulse trains, 90 offset, 1 zero pulse
Absolute: Absolute value
600 m
No
Yes, green LED per channel
8
8
Yes, optocoupler
0-signal: -3 V to 5 V
1-signal: 11 V to 30 V
A
A-5