6
Installation
and Operation
EDBC250SIO | 2.0
208
WARNING
Non-detection of incorrect external wiring while test pulses are disabled
Unsafe machine state, safety hazard
Use the output test pulses to detect cross-faults at the outputs and other
faults.
Note: Consider protecting the cables and/or laying them separately to en-
sure a sufficient degree of safety.
You are strictly advised against turning off the test pulses because this re-
duce the safety of the application.
WARNING
Reduced diagnosis if the test pulses at the outputs are deactivated
You are strictly advised against turning off the test pulses because this reduce
the safety of the application. If you turn off the test pulses at the outputs, en-
sure that the outputs are still diagnosed by:
Setting the outputs once a year and making sure that they are switched by a
function (of the application) or by completely shutting the device down and re-
starting it.
CAUTION
Shut-off of test pulses to the output
Owing to the construction of the outputs, shutting off the test pulses to an out-
put channel will not stop test pulses from being generated at that output if test
pulses are still set for the other output channel. Frequency and length of these
test pulses are determined by the other output. Verify that these test pulses
cannot switch the actuators connected.
To stop the generation of test pulses, you must disable the test pulses to both
outputs.
CAUTION
Minimum length of test pulses
Owing to the construction of the outputs, different test pulse length settings of
the two output channels will generate test pulses of the minimum length set for
both outputs of both channels.
Verify that both outputs comply with this minimum value to ensure that all test
pulses are of a minimum length. Verify that this minimum test pulse length can-
not switch the actuators connected.
