Omron SYSMAC CS1D-PD Series Operation Manual page 511

Online Replacement of I/O Units, Special I/O Units, and CPU Bus Units
Steps required before Starting Online Replacement without a Programming Device
Enable Online
Replacement without a
Programming Device
Note A Unit error may occur if the Unit is removed slowly.
The following steps must be performed in advance before replacing a Unit
online without a PLC Programming Device.
The Unit Removal without a Programming Device or Removal/Addition of
Units without a Programming Device function must be enabled in the PLC
Setup in order to remove a Unit without a PLC Programming Device.
Use a Programming Console to set the appropriate PLC Setup address.
Note Before removing a Unit during operation without a PLC Programming Device
(CX-Programmer or a Programming Console), always confirm that the Unit
Removal without a Programming Device or Removal/Addition of Units without
a Programming Device function has been enabled in the PLC Setup. If a Unit
is mistakenly removed without enabling the function in the PLC Setup, an I/O
bus error will occur and the PLC (CPU Unit) will stop operating.
When this function is enabled in the PLC Setup, the Unit Replacement without
a Programming Device Enabled Flag (A09911) will be ON. This flag can be
used to confirm that the required PLC Setup setting has been made.
Example
Indicator shows that Unit
removal without a Programming
Device is enabled.
Indicator controlled by A09911.
Program example
A09911
Maintenance Start Bit (A80015)
When the Unit Removal without a Programming Device function is selected
and a Unit is removed without a PLC Programming Device, one of the follow-
ing non-fatal errors will be generated depending on the type of Unit that was
removed. The PLC (CPU Unit) will not stop operating even if one of these
non-fatal errors occurs.
Unit type
Basic I/O Unit
Special I/O Unit
CPU Bus Unit
The Maintenance Start Bit is provided to prevent a non-fatal error from occur-
ring even if a Unit is removed without a Programming Device.
When you don't want a non-fatal error to be generated, turn this bit ON before
removing the Unit.
Output to LED
A09911 is allocated to a PT
indicator.
Non-fatal error
Basic I/O Unit error
Special I/O Unit error
CPU Bus Unit error
Section 11-4
Enable Unit removal without a
Programming Device in the PLC Setup.
A09911 is the Unit Removal without a
Programming Device Enabled Flag.
PT
Setting enabled
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