Relay Connections - Advantech PCIE-1762H User Manual

3.3

Relay Connections

After power on, the initial relay output status of the PCIE-1762H card should be as
shown in Figure 3.2 below.
Figure 3.2 Relay Output Connections
A write operation to I/O address, BASE +0, will change the output status of each
relay. For example, if Bit 0 of BASE +0 is set to "1" (logic high), relay 0, K0, will switch
from the "Normally Closed" position (NC0) to the "Normally Open" position (NO0).
This means that LOAD2 will be de-energized, while LOAD1 is energized.
To summarize, the "Common" line connects to the "Normally Closed" line if the corre-
sponding bit is set as 0 (power-on initial status). Otherwise, if the corresponding bit is
set as 1, then the "Common" line will connect to the "Normally Open" line.
13 PCIE-1762H User Manual