Ep1908 Process Image - Beckhoff EP1908 Operating Instructions Manual

Operation mode Description
The minimum supported frequency is 2 Hz. Values below this are shown as 0. The maximum supported
frequency is 500Hz. Values above this result in a diagnostic messages of the EP1908-0002. This
message can be reset through a rising edge of the safe output signal ErrAck of the EP1908-0002.
Two channel sync. Velocity Two-channel evaluation of the frequency, whereby at least one input signal always has to be at logical 1.
control channel x/y The frequencies and the upper limit frequencies have to be the same.
The two channels return logical 1 if the current frequency is below the frequency set under Velocity limit
channel x/y.
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 messages of the EP1908-0002. This
message can be reset through a rising edge of the safe output signal ErrAck of the EP1908-0002.
Two channel encoder Two-channel evaluation of the frequency. The upper limit frequencies are specified separately, but should
velocity control channel x/y but the same. The same frequencies have to be supplied, whereby all states are permitted that may occur
at the encoder interface.
The two channels return logical 1 if the current frequency is below the frequency set under Velocity limit
channel x/y.
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 messages of the EP1908-0002. This
message can be reset through a rising edge of the safe output signal ErrAck of the EP1908-0002.
Two channel async. velocity Two-channel evaluation of the frequencies. In this mode is only the compliance with the limits for the two
control channel x/y channels is monitored. The upper limit frequencies are specified separately.
The two channels return logical 1 if both frequencies are below the frequency set under Velocity limit
channel x/y.
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 messages of the EP1908-0002. This
message can be reset through a rising edge of the safe output signal ErrAck of the EP1908-0002.
Speed / frequency measurement
The permitted frequency range is between 2 Hz and 500 Hz. Values below are reported as 0 Hz,
values above result in a diagnostic messages of the EP1908-0002. This diagnostic message can be
reset through a rising edge at the safe output signal ErrAck of the EP1908-0002.
5.4

EP1908 process image

The process image of the EP1908-0002 consists of 6 bytes of input data and 6 bytes of output data. These
data contain the Safety over EtherCAT protocol. The eight safe input channels of the EP1908-0002 are
contained in the safe input data. The first channel of the safe output data contains the ErrAck signal, which
can be used to reset a diagnostic message of the EP1908, such as exceeding of the maximum allowable
frequency.
EP1908 Version: 3.0.0
Operation
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