HEIDENHAIN PWM 8 - Manual (Page 76)

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18 Specifications: Interface Board 1Vpp, absolute
18.1 Encoder input (IN)
Signal voltage: 5 Vpp max.
Input frequency for 1Vpp signals: approx. 500 kHz
Note:
Higher input frequencies (up to 1 MHz) are possible; in this case the accuracy tolerance of the PHA/TV
display can not be guaranteed any more!
The maximum input frequency only represents the cutoff frequency of the voltage input of the PWM8 input
(signal source: frequency generator). In real operation with encoders the frequency response highly depends
on the encoder connected and on the length of the cable.
18.2 Encoder output (OUT)
Output signal: like input signal without U
0
18.3 Signal assignment of the BNC sockets
Max. frequency for the analog signals at the BNC
sockets:
approx. 1 MHz (3dB)
1Vpp encoder, track AB
Signals on BNC socket A
A, R, A
Signals on BNC socket B B, A+B, B
Signals on BNC socket C R, Up,/UaS EXE
1Vpp encoder, track CD
Signals on BNC socket A
C, R, C
Signals on BNC socket B D, C+D, D
Signals on BNC socket C R, Up /UaS EXE
1Vpp encoder with EnDat or SSI interface
Signals on BNC socket A
A, CLK+, DAT-
Signals on BNC socket B B, CLK-, DAT+
Signals on BNC socket C /UaS, Up, Up
18.4 Measuring encoder current/voltage
Measuring range for current: 0 - 500 mA
Measuring range for voltage: 0 - 30 V
Tolerance: ±
5 %
18.5 Measuring signal amplitudes
Measuring range: 0.2 V
pp
– 1.6 V
pp
Measuring frequency: 10 Hz - 50 kHz
Tolerance without adjustment by software:
±
5 %
Tolerance with adjustment by software: ±
3 %
18.6 Display of /UaS interference signal
Track signal A and track signal B: < 0.3 Vpp
18.7 Terminating resistors
Terminating resistor: tracks A, B 121
Ω
Terminating resistor: tracks C, D 1k
Ω
Terminating resistor: data, clock not possible!