Encoder Input - WEG PLC300 H3 Guia De Instalacion

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.
1 2
3
ENC
ENC ENC ENC
A A B
A A B
ENC
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.
4 5 6 7
ENC ENC ENC ENC
B Z Z +V* 0 V
B Z Z +V*
Figure 3.5: Encoder connection
8 9 10 11
232 232 232
TX RX GND
0 V
(*) 5/12 V
Digital Inputs
12 13 14
485 485 485
A B GND
PLC300 | 13