Mitsubishi MELSEC-F FX-TRN-BEG-E, User Manual

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FX-TRN-BEG-E A: Let’s Learn the FX Series PLC! 1
B-7
3) Control targets and control specifications
In the previous automatic door example, control targets are "sensors detecting the
approaching vehicle" and "motors to open and close the door".
The PLC can control a variety of equipment.
Relationship between inputs and outputs
Parts of control related equipment are mainly classified into two types as shown in the
screen below.
- Devices controlled by the operator
→
Such as switches and push buttons
- Devices which indicate the machine
status
→
Such as sensors
- Devices which detect the machine
status
→
Such as lamps and buzzers
- Devices perform work
→
Such as
motors and solenoid valves
Each of the "input" and "output" equipment is individually connected to the PLC. The
operation of each piece of equipment is determined by the sequence program in the PLC.
Control target classification
In PLC control, they are regarded as the
’conditions’ for operation, and called ’inputs’
in the PLC.
In PLC control, they are regarded as what
are ’operated’, and called ’outputs’ in the
PLC.
Example of inputs and outputs in the PLC (in the unit of part)
Example of inputs and outputs in the PLC (in the unit of machine)