Dataq DI-500 Series, Руководство пользователя

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DI-500/510 Series and DI-750/760 Series Hardware Manual
5B Modules
39
DI-5B45 Frequency Input Modules
DESCRIPTION
Each DI-5B45 frequency input module provides a single channel of frequency input which is isolated and converted
to a high level analog voltage output. This voltage output is logic switch controlled, which allows these modules to
share a common analog bus without the requirement of external multiplexers (see block diagram).
The frequency input signal can be a TTL level signal or a zero-crossing signal. Terminal 3 (+In) on the field-side ter-
minal block is the “common” or ground connection for input signals. A TTL signal is connected from terminal 2 (-In)
to terminal 3 (+In), while a zero-crossing signal is connected from terminal 4 (+EXC) to terminal 3 (+In). Input cir-
cuitry for each of the signal types has hysteresis built in. An input signal must cross entirely through the hysteresis
region in order to trigger the threshold comparator.
A 5.1V excitation is available for use with magnetic pickup or contact-closure type sensors. The excitation is avail-
able on pin 1 (-EXC) and the excitation common is pin 3 (+In).
The DI-5B modules are designed with a completely isolated computer side circuit which can be floated to ±50V from
Power Common, pin 16. This complete isolation means that no connection is required between I/O Common and
Power Common for proper operation of the output switch. If desired, the output switch can be turned on continuously
by simply connecting pin 22, the Read-Enable pin to I/O Common, pin 19.
A special circuit in the input stage of the module provides protection against accidental connection of power-line
voltages up to 240VAC.
Ordering Information
MODEL INPUT RANGE OUTPUT RANGE EXCITATION
DI-5B45-01 0 to 500Hz 0 to +5V +5.1Vdc @ 8mA
DI-5B45-02 0 to 1kHz 0 to +5V +5.1Vdc @ 8mA
DI-5B45-03 0 to 3kHz 0 to +5V +5.1Vdc @ 8mA
DI-5B45-04 0 to 5kHz 0 to +5V +5.1Vdc @ 8mA
DI-5B45-05 0 to 10kHz 0 to +5V +5.1Vdc @ 8mA
DI-5B45-06 0 to 25kHz 0 to +5V +5.1Vdc @ 8mA
DI-5B45-07 0 to 50kHz 0 to +5V +5.1Vdc @ 8mA
DI-5B45-08 0 to 100kHz 0 to +5V +5.1Vdc @ 8mA
Signal Isolation
+PWR
–PWR
+IN
+OUT
–IN
–OUT
Power
Oscillator
+V
-V
+Vf
-Vf
s
s
Zero
Crossing
TTL
+ –
+ –
Surge Suppression
Threshold
Comparator
Excitation
and Protection
Isolated
Field-Side
Power
Isolated
System-Side
Power
LPF
F to V
1 2 3 4
+EXC
–EXC
5 6 7 8
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