User manual

ENG COMMUNICATION PORTS AND GPI/O WIRING
Page 38
PIN DESCRIPTION DIRECT. PIN DESCRIPTION DIRECT.
1 Anode of photocoupler input 1 IN 9 Cathode of photocoupler input 1 IN
2 Anode of photocoupler input 2 IN 10 Cathode of photocoupler input 2 IN
3 Anode of photocoupler input 3 IN 11 Cathode of photocoupler input 3 IN
4 + 12 V via 100 Ohm resistor OUT 12 GND /
5 + 12 V via 100 Ohm resistor OUT 13 Cathode of photocoupler input 4 IN
6 Anode of photocoupler input 4 IN 14 Cathode of photocoupler input 5 IN
7 Anode of photocoupler input 5 IN 15 Cathode of photocoupler input 6 IN
8 Anode of photocoupler input 6 IN
Inside the processor, a 100 ohm resistor connects the pins 4 and 5 to a +12V power supply. When nothing is
connected to the GPI input, the input voltage therefore is +12V.
Inside the processor, 470 ohm resistors also are inserted on series on each optoisolator anode (see
pins 1, 2, 3, 6, 7 and 8) for current limiting. Nominal current on optoisolators is 5 mA, while the max current is
10 mA.
EXAMPLE N° 1 –activation of GP INPUT 1 by external TTL (+ 5V DC) command
DB-15p
MALE
470 OHM
GND
1
9
15
8
EXTERNAL
TTL COMMAND
(connector internal view)
External TTL signal must be applied through a 470 Ω carbon resistor to the photodiode (pins 1 and 9).
Max current allowed: 10 mA. Nominal: 5 mA
EXAMPLE N° 2 – activation of GP INPUT 1 by clean contact (contact closure)
DB-15p
MALE
INPUT 1 ACTIVATION
1
9
12
15
8
The external switch (clean contact) is used to shortcut pin 1 and pin 4 (having pin 9 and 12 shortcut).