Leibinger RAPID Highspeed, Техническая информация

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Information about encoders
Page 18 of 31
6.3 The specifications of the encoder input of the printer
The RAPID printer offers 3 different signal inputs:
o
An input for RS422 signals
o
An input for HTL signals
o
An input for TTL signals
Each type of input has its own specifications regarding the voltage levels, the input resistance
and the maximum frequency. For high-speed applications, the maximum input frequency is of
particular importance.
Input specifications for interface X1 – Input for encoder signals
Pin Description Pin Description
A +5 V (max. 400 mA) G encoder channel /B RS422
B GND H encoder channel A TTL (5V)
C +24 V (1) J encoder channel B TTL (5V)
D encoder channel A RS422 K encoder channel A HTL (24V)
E encoder channel /A RS422 L encoder channel B HTL (24V)
F encoder channel B RS422 M PowerOn Option
Signal Parameter Value
RS422 Input level Differential: +/-200mV
Input voltage range: -0,3 to 5,5V
Max. frequency 10 MHz
Terminating resistance 120 Ohm
TTL Input level high 2,4V to 5,5V
Input level low -0,5V to 0,7V
Max. frequency 500 kHz
Input resistance 1 MOhm
HTL Input level high 12 to 28V
Input level low -0,5 to 3,5V
Max. frequency 500 kHz
Input resistance 3.3 kOhm
As the table shows, the RS422 input with 10 MHz allows the highest maximum input frequency.
The TTL and the HTL inputs are designed for a maximum frequency of 500 kHz.
Even encoders for high-speed applications cannot provide output frequencies higher than 350
kHz. Therefore, the inputs of the printer are not the limiting factor regarding the higher encoder
frequencies during high-speed printing.
Make sure that the encoder is able to provide the output frequency that is required for the
application!