User manual

Dx34510b_oi_e.doc / Jun-15 Page 9 / 42
Typical input circuit (standard version with HTL inputs):
PNP
4,7k
GND GND
+24V int.
Input
4,7k
GND
Input
+24V int.
NPN
The counting inputs A and B are designed for input frequencies up to 100 kHz (with all counter
modes) and up to 25 kHz (with all other operating modes). The minimum pulse duration on the
Reset input must be 500 µsec. (maximum frequency 1 kHz). All inputs are designed to receive
impulses from an electronic impulse source. Where exceptionally you need to use mechanical
contacts, please connect an external capacitor between GND (-) and the corresponding input (+).
With a capacity of 10 µF, the maximum input frequency will reduce to 20 Hz and miscounting due
to contact bouncing will be eliminated.
2.4. Adjustable Analog Output (DX 346 only)
A voltage output is available, operating in a range of 0 ... +10 V or –10 V ... +10 V according to
setting. At the same time, a current output 0/4 … 20 mA is available. Both outputs refer to the
GND potential and the signal polarity changes with the sign in the display.
The outputs provide a 14 bits resolution and the response time to changes of the measuring value
is approx. 7 msec. (fin > 143 Hz). The maximum current of the voltage output is 2 mA, and the load
on the current output can vary between 0 and max. 270 ohms.
Important note: “Voltage out” and “Current out” cannot be used together.
Please do never connect mA and V simultaneously!
2.5. Optocoupler / Transistor Outputs (DX 347 only) *)
The outputs provide programmable switching characteristics and are potential-free. Please
connect terminal 8 (COM+) to the positive potential of the voltage you like to switch (range
5V....30V). You must not exceed the maximum output current of 150 mA. Where you switch
inductive loads, please provide filtering of the coil by means of an external diode.
Opto Opto
33 R
(8)
(9)
(10)
Com+ (5 ... 35 V)
Output 1 (max. 150 mA)
Output 2 (max. 150 mA)
33 R
Preset 2
Preset 1
*) For relay outputs please refer to model DX342