Fig. 17 Route Signal Lines Correctly; Fig. 18 Route Signal Lines Incorrectly - Beckhoff EK1914 Operating Manual

Fig. 17: Route signal lines correctly
Fig. 18: Route signal lines incorrectly
Illustration legend
D
Blue arrows
Red arrows
The common routing of signals together with other clocked signals in a common cable also reduces the
maximum propagation since crosstalk of the signals can occur over long cable lengths and cause diagnostic
messages. If connection via a common cable cannot be avoided, the test pulses can be switched off
(parameter: "Testing of outputs active"). However, this then leads to a reduction in the degree of diagnostic
cover when calculating the performance level.
The use of contact points or plug connectors in the cabling similarly reduces the maximum expansion.
The typical length of a test pulse (switching from 24 V to 0 V and back to 24 V) is 300 µs to 800 µs but can
also be longer in individual cases. Testing usually takes place 3 to 6 times per second.
EK1914
D
Distance between cable ducts
Signature lines
Potential sources of interference
Version: 2.0.0
Installation
37