BECKHOFF EP1908 - Manual (Page 23)

Operation
EP1908-0002 21
4.2 Operating modes
Operating mode Description
Single logic channel x/y Each channel is evaluated individually
Asynchronous analysis
OSSD, sensortest
deactivated Mode for connecting devices with OSSD signals. The test pulses of the
OSSD devices must not occur simultaneously. The maximum
supported test pulse length is 350 µs.
In this mode the sensor test must be switched off for the input pair
used.
Any pulse repetition OSSD,
sensortest deactivated Mode for connecting devices with OSSD signals. The test pulses of the
OSSD devices may occur simultaneously. The maximum supported
test pulse length is 350 µs.
In this mode the sensor test must be switched off for the input pair
used.
Short cut channel x/y is no
module fault Mode for connecting safety mats. In this mode the two inputs of the
input pair used are monitored for cross-circuit. If a cross-circuit occurs
a person has walked on the safety mat, and the inputs report logical 0
in pairs.
The sensor test must be switched on for the inputs used.
Velocity control channel x /
Single logic channel y Speed monitoring channel x / individual evaluation channel y
The first channel (x) returns a logical 1 if the current frequency is below
the frequency set under Velocity limit channel x.
The second channel (y) supplies the current signal state at input 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 message of the EP1908-0002. This
message can be reset through a rising edge of the safe output signal
ErrAck of the EP1908-0002.
Single logic channel x /
Velocity control channel y Individual evaluation channel x / Speed monitoring channel y
The first channel (x) reports the current signal state of input x.
The second channel (x) returns a logical 1 if the current frequency is
below the frequency set under Velocity limit channel 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 message of the EP1908-0002. This
message can be reset through a rising edge of the safe output signal
ErrAck of the EP1908-0002.
Velocity control channel x/y Speed monitoring channel x / speed monitoring channel y
The first channel (x) returns a logical 1 if the current frequency is below
the frequency set under Velocity limit channel x.
The second channel (x) returns a logical 1 if the current frequency is
below the frequency set under Velocity limit channel y.
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 message 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
control channel x/y Two-channel evaluation of the frequency, whereby at least one input
signal always has to be at logical 1. 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 message of the EP1908-0002. This
message can be reset through a rising edge of the safe output signal
ErrAck of the EP1908-0002.