ZU25201e_e.doc / Sep-13
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5.2. Impulse levels and symmetric / asymmetric input formats
Positions 5 and 7 of DIL1 together with positions 3 to 6 of DIL2 allow setting of all imaginable
combinations of levels and formats.
All subsequent tables use the following definitions:
„0“ = switch OFF, „1“ = switch ON and
„x“ = position not important
Switch settings refer to impulse inputs A / B only, but the
Control Input (terminal 10) provides always HTL / PNP format, i.e.
you must apply a positive voltage 10 – 30 volts to activate the
function
Where you use 2-wire sensors with NAMUR characteristics,
connect the positive pole of the sensor to the corresponding input
terminal, and the negative pole to GND
Where subsequently you read (A) or (B), this indicates that the
inputs expect asymmetric (single-ended) signals and you will not
need the corresponding inverted signals
Where however you read (A and /A) or (B and /B), this indicates that
the inputs expect symmetric differential signals according to RS422
standard, i.e. it is mandatory to apply also the inverted signals
5.2.1.
Standard settings
If you just use encoders or sensors according to common industrial standards, and if also all
input signals should have the same level, you just can use one of the following three standard
settings and do not need to consider all further alternatives of switch settings.
DIL1
DIL2
Input Characteristics
Encoder Type
5 6 7
3 4 5 6
0
0
0 0 0 0
Asymmetric HTL input (A, B),
10 - 30 V level, NPN (switching to -) or
Push-Pull or NAMUR characteristics
Standard HTL encoders,
Proximity switches,
Photo switches etc.
1
0
0 0 0 0
Asymmetric HTL input (A, B),
10 - 30 V level, PNP (switching to +) or
Push-Pull characteristics
PNP Proximity switches,
Photo switches etc.
0
1
0 0 0 0
Symmetric TTL signals or
RS422 signals (A, /A), (B, /B)
(differential, including inverted signal)
Standard TTL encoders
providing A, /A, B, /B
output channels
