Omron SYSMAC CS1D-PD Series Operation Manual page 512

Online Replacement of I/O Units, Special I/O Units, and CPU Bus Units
5 Units removed.
Maintenance
Start Bit
(A80015)
Turned ON by user
before removing Units.
Online
Replacement
Completed Bit
(A80215)
472
This bit can be turned ON externally (just like the Online Replacement Com-
pleted Bit) by allocating the bit to an external switch on an Input Unit and
inputting the signal or turning ON the bit from a PT. (The bit can also be
turned ON from the CX-Programmer or a Programming Console.)
Note Do not turn ON the Maintenance Start Bit (A80015) continuously from the lad-
der program or other source. As long as the Maintenance Start Bit is ON,
errors will not be generated even if there are Unit malfunctions, so the system
may be adversely affected.
The Maintenance Start Bit will be turned OFF automatically when the Online
Replacement Completed Bit (A80215) is turned ON to restart data exchange
between the replacement Unit and the CPU Unit.
When two or more Units have been removed and replacement Units are
being added to the system in order, the Maintenance Start Bit will be turned
OFF when data exchange is restarted with the last Unit that was replaced.
Example
Mount 2 Units
and turn A80215
from OFF to ON.
Units to replace: Units to replace:
5 Units 3 Units
The CPU Unit will not detect errors occurring in Units,
including Units not being replaced. (See note.)
Restart data
exchange with
2 Units.
Note If you want to detect errors in other Units before all of the Units have been
replaced online, turn OFF the Maintenance Start Bit.
Online Replacement Completed Bit (A80215)
When the Unit Removal without a Programming Device function is selected
and a Unit has been installed during operation without a Programming
Device, the Online Replacement Completed Bit (A80215) must be turned ON
in order to restart the data exchange between the replaced Unit and the CPU
Unit.
When turning this bit ON externally, allocating the bit to an external switch or
turn the bit ON from a PT. (The bit can also be turned ON from the CX-Pro-
grammer or a Programming Console.)
Mount 2 more Units Mount 1 more Unit
and turn A80215 from and turn A80215
OFF to ON. from OFF to ON.
Units to replace: Replacement
1 Unit complete
Restart data Restart data
exchange with exchange with
2 more Units. 1 more Unit.
Section 11-4
The system automatically
turns the bit OFF when all
of the Units have been
replaced and data
exchange has restarted
with all of those Units.