Output Port (Relay) - SeaLevel PLC-16.PCI User Manual

Output Port (Relay)

The PLC-16.PCI provides 8 Form C (SPDT) Electro-mechanical relays. These relays have three connections;
Normally Open (NO), Normally Closed (NC) and a Common. The relays are all de-energized at power-on. Data to
the relays is latched by a write to the base+2 address. On/off status of the relays can be read back by a read at the
base+2 address.
Output Bit D0
The above is a schematic representation of the Output Bit D0. The NC contact would be Pin 1 on the HD44, N0
would be Pin 31 and the Common would be Pin 16.
Sealevel Systems PLC-16.PCI
+5 V
4
1
3
2
5
Technical Description
HD-44
1
16
31
Page 6