Mitsubishi MELSEC-A Series Operating Manual page 112

6. HOW TO USE EACH FUNCTION
"LSEC-A
[Explanatlon]
(1)
When the connected ACPU is an AOJ2CPU, A2ACPU, A3HCPU,
A3MCPU, or A3ACPU, offline switches are not displayed.
(2) Devices that can display offline switches are
Y,
M ,
L,
B,
and F.
(3) If an offline switch is set or canceled during the device monitoring test in
the TEST mode, the offline switch is displayed automatically.
(4) Section 6.7.5 explains how to operate offline switches.