It251_02c_oi_e.doc / Apr-16
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4.
Connections and Terminal Assignments
For frequency input, either the RS 422 inputs (D-SUB) or the 10 … 30 V HTL inputs can be used.
The other inputs, which are not in use, must remain unconnected or must be disabled by
corresponding DIL switch setting.
The outputs provide impulse signals at TTL / RS422 level as well as at a 10 … 30 V HTL level,
and either one or the other or both at a time can be used, whichever is applicable.
Please note that all input and output signals refer to the same common potential (GND) which at
the same time is also the minus potential of the power supply.
RS422 output
(male)
(female)
/A
/B
/Z
A
B
Z
+
Screen*
_
7
8
9
10
11
12
1
2
3
4
5
6
A
B
Z
DIL switch 1
Impulse divider
DIL switch 2
Impulse divider
DIL switch 3
Index divider
DIL switch 4
Configuration
GND
In
p
u
t
H
T
L
O
u
tp
u
t
H
T
L
H
T
L
O
u
tp
u
t
Power on
Impulse A
*) This screen terminal allows to connect the metallic housings of the SUB-D-connectors to the
potential applied to terminal 12 (e.g. PE or external GND or else), when the corresponding DIL
switch is on (see settings of DIL 4 switch)
The D-SUB input connector provides an auxiliary output of +5 V / 130 mA for encoder supply.
The HTL inputs provide PNP characteristics and must be switched to +.
Where you use encoders with PNP or push-pull outputs, there will be no problem.
Encoders with NPN outputs (open collector type) will however need an external pull-up resistor
(e.g. 2.7 kOhm). See the schematics of the input circuit for calculation of the resistance.
At any time, the total transmission characteristics of encoder, external components and capacity
of the cable must ensure proper signals at the input terminals of the unit, with respect to the
levels, the shape and the phase displacement A/B.
The output swing on the HTL push- pull outputs corresponds to the input supply voltage applied to
terminals 10 and 11.
The green front LED signals that power is on, and the yellow LED signals the input impulses from
input channel A respectively A, /A.
Power Supply
18 … 30 VDC
