Omron SYSMAC CS1D-PD Series Operation Manual page 515

Online Replacement of I/O Units, Special I/O Units, and CPU Bus Units
1,2,3...
!Caution Do not touch any of the terminals or terminal blocks while the power is being
1. Confirm that the Unit Removal without a Programming Device or the Re-
moval/Addition of Units without a Programming Device function is enabled
in the PLC Setup.
supplied. Doing so may result in electric shock.
Note a) If an Output Unit is being replaced, output ON status is retained
and the outputs will go back ON as soon as online replacement is
completed.
b) When a Unit has been removed during operation without a PLC
Programming Device (CX-Programmer or a Programming Con-
sole), data transferred from the removed Unit to the CPU Unit may
be invalid. If an invalid data transfer will adversely affect the sys-
tem, use a Programming Device to replace the Unit online.
Section 11-4
475