The 8 channels SSR relay output / photo isolator input board for pocket DIO provides SSR relay output functions and photo isolator input functions. The SSR relay output part provides 8 solid state (SSR) 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¡K.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.

Features of 8 channels SSR output / 8 channels
*Support 8 SSR relay output channels and 8 photo couple input channels.
*The SSR operation characteristics are similar to relay.
*Provides more than 12 types of SSR output module.
*The Normal Open (NO) and Common Contacts (COM) of each relay is brought out to the screw connector.
*Allow the photo input signals to be completely floated and prevent the ground loops.
*Input current : 80 mA 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.

Hardware Connections

Hardware Configurations
Before you use the terminal board, be sure that it is properly connected in the 8255 card

The LED 9 in the terminal board shows the power on status. When it lights, power is applied in the board, otherwise it is off.

The jumpers are used to select isolated or isolated mode, when jumpers are open, the mode is isolated, when short, the mode is non-isolated. JP1A and JP1B correspond to channel 0, JP2A and JP2B correspond to channel 1, etc. When set to non-isolated mode, the IxL is short to system ground (where x is the channel number)


Pin Assignment of TB1 (Photo Isolator)

Pin Assignment of T2 (Relay Output)