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04_PLC_1_Digital Output.doc
Programmable Logic Controller
Handout
INDUSTRIAL AUTOMATION AND NETWORKING SECTION
EA5 - Programmable Logic Controller
==== DDIIGGIITTAALL OOUUTTPPUUTT MMOODDUULLEE ====
Function:
Receive signal from the CPU and converts them into forms that are appropriate to
produce control actions by external devices such as solenoids, motor starters.
Digital (on/off ) output signal:
There are several types of digital output module:
� Relay
� Triac
� Transistor
� Current sourcing
� Current sinking
� TTL
Page 2
04_PLC_1_Digital Output.doc
Programmable Logic Controller
Handout
INDUSTRIAL AUTOMATION AND NETWORKING SECTION
EA5 - Programmable Logic Controller
Output devices that receive on/off signal from the PLC:
� Indicator lights
� Motor starter coil/contactor
� Fluid power valve solenoids
� Siren/buzzer
There are LEDs indicating the status of the signal sent to each device connected to the
output channels. These LEDs are very useful in troubleshooting.
� Relay output card