BECKHOFF EP1908 - Manual (Page 36)

Operation
34 EP1908-0002
4.5.3.4 Configuration of the EP1908 for mode Two Channel Sync Velocity Control
The TwinSAFE EtherCAT Box also supports direct connection of initiators and encoders for speed
measurement or frequency (24V
DC
).
The set mode Two Channel SyncVelocity Control Channel x/y determines a frequency from the signals of
an input pair of the EP1908-0002, whereby one input signal always has to be set to logical 1. The
frequencies of the two input signals must be the same.
If the current frequency is below the limit frequency set for both channels (Velocity limit channel x/y), the
corresponding input pair returns a logical 1. If the frequency is above the set limit frequency, the
corresponding input pair returns a logical 0. The limit frequencies must be the same.
The minimum supported frequency is 2 Hz. Values below this are shown as 0. The maximum supported
frequency is 500 Hz. Values above this result in a diagnostic message of the EP1908-0002. This
message can be reset through a rising edge of the safe output signal ErrAck of the EP1908-0002.
Parameter:
•
Connect the signals of the used sensors to input pairs 1 and 2, 3 and 4, 5 and 6 or 7 and 8
•
Switch off the sensor test for the inputs used
(Sensor test Channel x active = FALSE)
•
Set the parameter "Logic of Channel x and y" to
"Two Channel SyncVelocity Control Channel x/y"
•
Set the parameters Velocity limit channel x and Velocity limit channel y of the used channels to
the required value. The entered value has the unit 1/10 Hz.
Example for a signal curve of the input signals: