User Device; Input (X); Output (Y); Internal Relay (M) - Mitsubishi Electric MELSEC iQ-R16MTCPU Programming Manual

3.2

User Device

This section describes user devices used with the Motion CPU.

Input (X)

These are commands or data given to the Motion CPU with external devices such as buttons, switches, limit switches, and
digital switches.

Output (Y)

These are program control results output to external signal lamps, digital displays, electromagnetic contactors, and solenoids,
etc.

Internal relay (M)

These are devices intended for use as auxiliary relays inside the Motion CPU. When the following operations are performed,
all internal relays turn OFF.
• Multiple CPU system power OFF  ON
• Multiple CPU system reset
• Latch clear
Some internal relays (M) are used as positioning signals.
Refer to the following for details.
MELSEC iQ-R Motion Controller Programming Manual (Positioning Control)

Link relay (B)

These are devices intended for use as auxiliary relays inside the Motion CPU. Link relays perform the same role as internal
relays (M).

Annunciator (F)

These are devices intended for use as auxiliary relays inside the Motion CPU. Annunciators perform the same role as internal
relays (M).

Data register (D)

These devices are able to store numerical data. Some data registers (D) are used for positioning control.
Refer to the following for details.
MELSEC iQ-R Motion Controller Programming Manual (Positioning Control)

Link register (W)

These devices are able to store numerical data. Link registers (W) perform the same role as data registers (D).

Motion register (#)

These devices are able to store numerical data. Some Motion registers (#) are used as monitoring devices.
Refer to the following for details.
MELSEC iQ-R Motion Controller Programming Manual (Positioning Control)
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3.2 User Device