Digital Inputs
PLC300 | 13
E
ng
lis
h
3.5 ENCODER INPUT
The PLC300 features an insulated input for differential encoder, with its own supply
of 5 or 12 V. The maximum frequency of the pulses is 100 kHz. Maximum length of
the encoder cable: 30 m.
An internal insulated supply of 5 or 12 Vdc, with capacity of up to 300 mA, is available
for the encoder. The selection between 5 or 12 V must be done in the PLC setup.
The default value is 5 V.
(*)
5/12 V
A
A
B
B
Z
Z
0 V
ENC
XC
3
+V*
ENC
A
ENC
A
ENC
B
ENC
B
ENC
Z
ENC
Z
ENC
+V*
ENC
0 V
232
TX
232
RX
232
GND
485
A
485
B
485
GND
1
7
4
10
2
8
5
11
12
13
14
3
9
6
Figure 3.5:
Encoder connection
24 V Encoder : You can connect a 24 V encoder, since externally powered and only
signals A, B, and Z are used.
The 0 V of the encoder must be connected to 0 V of XC3 (pin 8)
A, B and Z signals are NOT tolerant to 24 V.
The signals A, B and Z can be used to fast counting and interrupts, also in 24 V.
Encoder PNP: if an encoder with PNP outputs is used, resistors of 1 K ohm must be
connected from the used signals to the 0 V.
E.g.: PNP encoder with A and B signals.
