![background image](http://html1.mh-extra.com/html/icp-das-usa/piso-p8r8u/piso-p8r8u_user-manual_3551649015.webp)
2.3. Relay Output
Whenever data is written to the output control register, the relays will switch to
either NO (Normally Open) or NC (Normally Closed) status as specified by the
control code. A “1” in the control register causes the corresponding relay in an
energized state and shorts the COM (Common) to NO contact; while a “0” in the
control register turns off the corresponding relay and shorts the COM to NC contact.
When the power is first switched on or a reset signal from hardware or software
is occurred, the control register is 0 and all relays short to NC contact. The following
figures show how to use the relay.
Basic Circuitry: (Current Rating < 0.3 A):
Figure 2-3. Basic relay circuit.
Load
AC/ DC
Power Supply
COM NO
Relay Contact
Heavy Loading Application (> 0.3 A):
Power Relay
P16R16U
DO Relay
Power Relay
Contact
Heavy Loading
Figure 2-4. Heavy load relay circuit.
PISO-P8R8U/P16R16U/PEX-P8R8i/P16R16i User Manual (Ver.1.6,Mar/2010, PMH-021-16) -
15
-