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Features
2.3
Operational Values
System portion
Voltage supply (from SMP16 bus)
Current consumption with nominal voltage (without encoder power)
Counter inputs
Number of channels
Counter size
Interfaces: encoder inputs A, B, and N (zero marking pulse)
Operational values with 24 V technology:
Differential
Differential, max. ratings
Single-ended, low level
Single-ended, high level
Single-ended, max. ratings
Input current with 24 V technology (U
See RS 422 specifications for operational values with RS 422.
Input frequency for incremental encoders:
Input frequency with frequency/gate time measurement
Extra inputs
Number
Interfaces
Input voltage, low level
Input voltage, high level
Input voltage, max. ratings
Input current with high level
5 V encoder power
Encoder voltage
Total current
Short-circuit immunity
Notes on 24 V interface
The 24 V interface offers extra immunity to interference. The physical characteristics of this interface
(high voltage swings with currents > 10 mA) restrict its use with high-speed applications.
For this reason, encoders with the RS 422 interface should be used for encoder applications with track
frequencies > 500 kHz. Otherwise, the encoder signals might not be transferred accurately which
would cause counting errors in the system.
12
= 24 V)
in
(U
= 30 V)
in
(U
= 24 V)
in
(U
= 30 V)
in
SMP16-SFT251
+5 V ±5%
Max. of 400 mA
2
32 bits
24 V technology, opto-decoupled
(single-ended or differential)
or RS 422
±13 V to ±30 V
±34 V
–3 V to +5 V
+13 V to +30 V
±34 V
11.4 mA (typ.)
15.1 mA (max.)
2 MHz (max.)
4 MHz (max.)
4 per channel
24 V technology
–3 V to +5 V
+13 V to +30 V
±34 V
11.4 mA (typ.)
15.1 mA (max.)
5 V (typ.)
Depends on the power supply of the
SMP16 system and the voltage drops on
the board (typically 0.2 V)
720 mA (max.)
Yes (with SMD safety fuse)
©Siemens AG 2003, All Rights Reserved
(4)J31069-D2090-U001-A1-7618
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