Relation Among Devices - Mitsubishi Electric MELSEC-Q Structured Programming Manual

FXCPU Structured Programming Manual
[Device & Common]
1.1.1

Relation among devices

Arrow indicates signal transfer.
Auxiliary relay: M
The PLC has many
built-in auxiliary
relays.
The symbol of
auxiliary relay is "M".
State relay: S
The PLC has many
built-in state relays.
The symbol of state
relay is "S".
Output terminal or
output connector
14
Input relay: X
The PLC receives signals from external input switches via input relays.
The symbol of input relay is "X".
The PLC has built-in input relays in accordance with its scale.
Timer: T
The PLC has many
built-in timers.
The symbol of timer
is "T".
Contact (one normally-open contact) for external output of output relay
The PLC has built-in output contacts in accordance with its scale.
Input terminal or
input connector
1 2 3 4
Counter: C
The PLC has many
built-in counters.
The symbol of
counter is "C".
1 Device Outline
1.1 Devices Constructing PLC
Output relay: Y
The PLC drives
external loads via
output relays.
The PLC has many
built-in output relays.
The symbol of
output relay is "Y".