# Device Addressing – Number of Devices

The Number of Devices column of the Device Addressing tab defines the size of the data block that is communicated with the Mitsubishi PLC/MC. The size is specified in units of PLC/MC "devices" (words or bits). The maximum data size varies depending on the selected PLC/MC (iQ-Q Series or FX Series).

PLC Series | Block Name | Selected Device | Available Number of Devices
FX Series | Control | None X - Input Relay Y - Output Relay M - Internal | Property is read-only, set to 32 bits.
D - Data Register R - Extension Reg | Property is read-only, set to 2 words.
Status | None X - Input Relay Y - Output Relay M - Internal | Property is read-only, set to 32 bits.
D - Data Register R - Extension Reg | Property is read-only, set to 2 words.
Input Block | None | Property is read-only, set to 0 bits.
D - Data Register R - Extension Reg | Property value can be 1–960 words.
Output Block | None | Property is read-only, set to 0 bits.
D - Data Register R - Extension Reg | Property value can be 1–960 words.
iQ-Q Series | Control | None X - Input Relay Y - Output Relay M - Internal L - Latch Relay F - Annunciator B - Link Relay | Property is read-only, set to 32 bits.
D - Data Register W - Link Register R - File Block Register ZR - File Register | Property is read-only, set to 2 words.
Status | None X - Input Relay Y - Output Relay M - Internal L - Latch Relay F - Annunciator B - Link Relay | Property is read-only, set to 32 bits.
D - Data Register W - Link Register R - File Block Register ZR - File Register | Property is read-only, set to 2 words
Input Block | None | Property is read-only, set to 0 bits.
D - Data Register W - Link Register R - File Block Register ZR - File Register | Property value can be 1–960 words.
Output Block | None | Property is read-only, set to 0 bits.
D - Data Register W - Link Register R - File Block Register ZR - File Register | Property value can be 1–960 words.