Operation
44
F-FEM-CNT — User’s Guide
Compared to the AB channels, the zero track for the incremental encoder input
is an exception because it recognizes only the occurrence of exactly one pulse
per measuring interval (1 ms). The resulting maximum frequency is 500 Hz. This
value is sufficient because this pulse is generated only once per revolution. This
corresponds to a maximum speed of 30000 rpm.
4.3.2
Sensor Inputs
Measurement Quantity Min Typical Max Unit
Digital Pick-up at Pins 11, 12, 24, 25
Input voltage at logic high 4.5 24 48 V
Input voltage at logic low -2.5 0 2.5 V
Input current at logic high 2 4 mA
Inductive Pick-up at Pins 5, 17
Input voltage 40 V
Input Resistance 5400 Ω
Incremental Encoder at Pins 6, 8, 9, 18, 21, 22
Input voltage acc. to EIA standard RS422 4.5 30 V
Differential input voltage e.g. at Pin 6 – 18 60 mV
Output Voltage at Pins 7, 10 or 20, 23, respectively, for
incremental encoder supply
4.5 5 V
Output Current at Pins 7, 10 or 20, 23, respectively, for
incremental encoder supply
170
at 60°
250 mA
Output Voltage at Pins 13,16 24 V
Output Current at Pins 13,16 70 mA
Acquisition rate can be set 1 1000 Hz
Cut-off frequency for all 3 sensor types 0 1 MHz
Tab. 5 Sensor inputs
Sensor Type Cut-off Frequency
Min Max Unit
Incremental Encoder 0 1 MHz
Digital Input 0 1 MHz
Inductive 0 400
(at 20 V
ss
)
kHz
Tab. 6 Cut-off frequencies of the input circuits for the various sensor types
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