Rockwell Automation 1394 SERCOS Interface Multi-Axis Motion Control System Installation Manual - Manual (Page 54)

Publication 1394-IN002B-EN-P — February 2004
2-22 1394 SERCOS Interface Connector Data
The following table provides a description of the AM, BM, and IM
inputs for auxiliary (TTL) motor encoders.
The following table provides a description of the AM and BM inputs
for Sine/Cosine encoders when used as motor or auxiliary feedback.
Feedback Power Supply
The 1394 system module generates the +5V and +9V dc for the motor
and auxiliary feedback power supplies. Short circuit protection and
separate common mode filtering for each channel is included. Refer to
the table below for specifications.
1 5 volt total for all axes.
2 9 volt total for all axes.
Parameter Description Minimum Maximum
AM, BM, and IM
ON State
Input Voltage
Input voltage difference between the + input
and the - input that is detected as an ON
state.
+1.0V +7.0V
AM, BM, and IM
OFF State
Input Voltage
Input voltage difference between the + input
and the - input that is detected as an OFF
state.
-1.0V -7.0V
Common Mode
Input Voltage
Potential difference between any encoder
signal and logic ground.
-7.0V +12.0V
DC Current Draw Current draw into the + or - input. -30 mA 30 mA
AM, BM Input
Signal Frequency
Frequency of the AM or BM signal inputs.
The count frequency is 4 times this
frequency, since the circuitry counts all four
transitions.
— 1.0 MHz
IM Pulse Width
Pulse width of the index input signal. Since
the index is active for a percentage of a
revolution, the speed will determine the
pulse width.
125 nS —
AM, BM Phase Error
2.5 MHz Line
Frequency
Amount that the phase relationship between
the AM and BM inputs can deviate from the
nominal 90°.
-22.5° +22.5°
AM, BM Phase Error
1 MHz Line
Frequency
Amount that the phase relationship between
the AM and BM inputs can deviate from the
nominal 90°.
-45° +45°
Parameter Description Minimum Maximum
Sine/cosine
Input Signal
Frequency
Frequency of the Sine or Cosine signal inputs. — 200 kHz
Sine/cosine
Input Voltage
Peak-to-peak input voltages of the Sine or Cosine
inputs.
0.5V (p-p) 2.0V (p-p)
Supply Reference
Voltage Current mA
Minimum Nominal Maximum Minimum Maximum
+5V dc EPWR_5V 5.13 5.4 5.67 10 400
1
+9V dc EPWR_9V 8.3 9.1 9.9 10 275 2