Leibinger JET3 up, Operating Manual

Page: 393 / 412

Group 12 Appendix - Encoder Guidelines Page 391
JET3up Release R1.06
Interfaces:
The output signals (interfaces) of encoders are offered in different standards:
Typ Output Signals Technologie
HTL
24 Volt

two output signal => „A“ and „B“

isn‘t qualified for longer cable distances (maximum 10m)

in spite of the higher signal level a very good “noise immunity” as with the interface
type RS422 cannot be achieved!
Typ Output Signals Technologie
TTL
5 Volt

two output signals
⇒
„A“ und „B“

not qualified for longer cable distances (max. 6m)

is quite „noise sensitive“ and therefore almost not qualified for the industrial en-
vironment and applications.
Typ Output Signals Technologie
RS422
(TTL)
5 Volt

four output signals
⇒
„A“, „/A“, „B“ und „/B“

due to the inverted signals a very high „noise immunity“ can be realized. Injected
„noise signals“ on long cable lengths almost didn’t show any negative effect.

even qualified for longer cables over 10m. But the “voltage drop” of the complete
cable length must be checked and judged.
ATTENTION
Please note!
For each interface, in general just shielded and grounded cables shall be
used the reduce any „noise influence“ as much as possible.
Besides the encoder signal cable should not be installed in closer
neighborhood with cables which transmits high frequencies or high
energies. Please avoid to use any unnecessary long cable lengths and
keep in mind: the shorter, the better!