The 8 channels relay output / photo isolator input board for pocket DIO provides relay output functions and photo isolator input functions. The relay output part provides 8 Single Pole Single Throw (SPST) relays to drive 8 different output channels. Each relay channel can be used to control ON / OFF of external devices, to drive external high power relays, to activate alarms ...etc.

The photo isolator input part provides 8 photo couple digital input channels, which allow the input signals to be completely floated and prevent the ground loop.

The features of 8 channels relay output / 8 channels photo isolator input board are:

*Support 8 relay output channels and 8 photo couple input channels.
*Max contact rating for relay: 120V AC/DC 1AMP.

*Attraction time for relay: 3 ms.

*Fall off time for relay: 2 ms.

*Isolation resistance for relay: 100M OHM.

*Life expectancy for relay: 5 million operation at full load.
*The Normal Open (NO) and Common contacts (COM) of each relay is brought out to the screw connector.
*Breakdown voltage : AC/DC 500V minimum.
*Allow the photo input signals to be completely floated and prevent the ground loops.
*Input current : 80mA maximum for each isolated input.
*Input voltage : 15V DC maximum for each isolated input.
*LED indicates when corresponds channel is activated.

*Isolated or non-isolated modes selectable.

*Operating temperature 0 to 60 oC.

*Storage temperature ¡V20 to 70 degree oC.

*Humidity 5% to 95% in non-condensing

1. Terminal Board

The figure of pocket DIO terminal board is shown on the following page.



Before you use the terminal board, you must be sure to have this board plugged into pocket DIO.

The LED17 in terminal board shows the power on status. When it turns to light, we have power to this board, otherwise when it does not light, no power is provided.

The Jumpers are used to select isolated or non-isolated mode, when open the jumpers, it sets to isolated mode, otherwise when short the jumpers, it sets to non-isolated mode. JP1 and JP2 correspond to channel 0, JP3 and JP4 correspond to channel 1, etc. When set to non-isolated mode, the IxL is short to system ground. (where x is the channel number)

2.2 Pin Assignment of TB1 (Photo Isolator)

2.1 Pin Assignment of T1

Pin Description
1 I0H
2 I0L
3 I1H
4 I1L
5 I2H
6 I2L
7 I3H
8 I3L
9 I4H
10 I4L
11 I5H
12 I5L
13 I6H
14 I6L
15 I7H
16 I7L

Pin Description Pin Description
1 GND 14 +5V
2 DI0 15 GND
3 DI1 16 GND
4 DI2 17 GND
5 DI3 18 GND
6 DI4 19 GND
7 DI5 20 DO3
8 DI6 21 DO4
9 DI7 22 DO5
10 DO0 23 DO6
11 DO1 24 DO7
12 DO2 25 +5V
13 GND

2.3 Pin Assignment of TB2 (Relay Output)

Pin Description
1 COM0
2 OTO0
3 COM1
4 OTO1
5 COM2
6 OTO2
7 COM3
8 OTO3
9 COM4
10 OTO4
11 COM5
12 OTO5
13 COM6
14 OTO6
15 COM7
16 OTO7