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17 PCI-1761 User Manual

Chapter 3 Signal Connections

3.3 Relay Connections

After power on, the initial relay output status of PCI-1761 is shown as below:

Figure 3.2 Relay Output Connection

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 "1" (logic high), relay 0, K0, will switch

from position "NORMALLY CLOSED", R0_NC, to position "NORMALLY OPEN",

R0_NO. This means that LOAD2 will be de-energized, while LOAD1 is energized.

To summarize, the "COMMON" line connect to the "NORMALLY CLOSED" line, if the

corresponding 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.

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