Omron CS1D DUPLEX SYSTEM - 10-2009 Operation Manual page 489

Online Replacement of I/O Units, Special I/O Units, and CPU Bus Units
Procedure for Online Replacement without a Programming Device
Flowchart of the Replacement Procedure
Turn ON the Maintenance Start Bit (A80015) if you want to prevent non-fatal errors when
removing a Unit without a Programming Device.
(Do not turn ON the bit continuously from the ladder program.)
Turn ON the Online Replacement Completed Bit (A80215). See note.
(Do not turn the bit ON continuously from the ladder program.)
A Unit still needs to be replaced.
(If the Maintenance Start Bit (A80015) was turned ON, it will be turned OFF automatically.)
1,2,3...
!Caution Do not touch any of the terminals or terminal blocks while the power is being
Mount the replacement Unit.
Data exchange restarts with the mounted Unit.
Online Replacement Completed
Note The Online Replacement Completed Flag is required only when the Unit
Removal without a Programming Device function is being used. When the
Removal/Addition of Units without a Programming Device function is being
used, the data exchange is restarted automatically after the replacement Unit
is mounted.
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.
Remove the Unit.
Replace Unit?
All Unit replacements completed.
Section 11-4
453