Siemens Add 7 AddFEM, Manual

Page: 56 / 148

AddFEM Technical Data
4-5
AddFEM
C79000–G8076–C900–03
Counting Pulse Inputs
1)
Number of inputs 3
Type of input to IEC 61131–2 Type 1/2
Voltage range –28...+28 V DC
0-signal level –28...+3 V
1-signal level +8...+28 V
Coincidence factor at operation with voltage
> 26 V The counting pulse inputs are also specially
designed for low input voltage (high recogni-
tion from 8 V). In order to limit the power dissi-
pation the input voltage has to remain limited
to 26 V or a pulse duty factor of 60% with a
maximum pulse length of 1 minute or only 2 of
3 inputs may be switched to 1 at the same
time.
Load impedance 1 k
Ω
to 3 k
Ω
Current/voltage characteristic across the en-
tire operating range Refer to Fig. 4-1!
Delay time (TID) 50
µ
s for signal transitions from 0 to 1
50
µ
s for signal transitions from 1 to 0
Cyclic signal evaluation every 2 ms
Disturbing pulses smaller than 10.667
µ
s are
filtered out.
Additional hardware evaluation by counter.
Input frequency (f
in
) 0...20 kHz
Counter resolution 32 bits
Measuring precision Better than 10
–4
Updating interval 2 ms
Integration period at frequencies < 800 Hz 20 ms
Filter During every updating instant the frequency is
recalculated as the mean of the counting pul-
ses detected during the last 20 ms.
Sense of rotation recognition Sense of rotation recognition possible by inter-
connecting channel 1 and channel 2.
Refer to Chapter 3.1.3
(Possible from
Version 8 of 6DL3100–8AA, Version 7 of
6DL3100–8AB, all Versions of 6DL3100–8AC)
Display The converted values read by the internal mi-
cro controller unit are displayed at the LED on
the front.
Configuration of the terminals Refer to Appendix A, connector X6, Page A–2
1)
Counting pulse inputs can also be used as digital inputs!
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