Emerson Epsilon Eb Series Reference Manual page 44

drive's 5 volt logic supply so external pull-ups and biasing circuitry is not required. When
proper installation techniques are followed as shown below, the differential input setup will
provide a more robust and noise immune system than a single ended input setup.
Differential input is recommended under any of the following conditions:
• Pulse width < 2 µs
• Pulse frequency > 250 kHz
• Pulse command cable length > 25 feet
• Noisy electrical environments
Differential input circuit specifications:
Input frequency maximum
Input device:
Input impedance
Maximum voltage applied to input pins (A, A/) or (B, B/ )
Single Ended (referenced to 0V drive logic)
Differential (referenced to mating differential input)
Maximum common mode voltage
Minimum differential voltage required
Input voltage hysteresis
ECI-44 Terminal
Connector Pin #
Sync Enc In "A"
Sync Enc In "A/"
Sync Enc In "B"
Sync Enc In "B/"
Single ended input circuit specifications:
Single ended input specifications:
1 MHz maximum input frequency
Internal 330 ohm pull-up to 5 volt (non-isolated)
1.5 volt low level
3.5 volt high level
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Command Pulse-Direction
Signal
27 Pulse
41 Pulse/
40 Direction
26 Direction/
Operational Overview
2 Mhz
AM26C32
12 Kohms each input
+/-10V
+/-10V
+/-7 V
200 mV
60 mV
Pulse-Pulse Pulse Quadrature
Signal Signal
Pulse + A
Pulse +/ A/
Pulse - B
Pulse -/ B/
27