CS1D-DPL02D Omron, CS1D-DPL02D Datasheet - Page 150

• Manufacturer Part Number: CS1D-DPL02D
• Description: CS1D Dual IO Exp
• Manufacturer: Omron

Specifications of CS1D-DPL02D

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Active and Standby
CPU Units
Active and Standby CPU
Unit Operations
Duplex CPU Units
In Duplex Mode, the two CPU Units run the same user program. One of them
executes actual control (e.g., refreshing the other Units), and the other one
remains on standby as a backup.
The two CPU Units use synchronized processing and the same user program,
I/O memory, and Parameter Area data.
When the user program or parameters (e.g., PLC Setup) are changed, they
are transferred from the active CPU Unit to the standby CPU Unit. I/O memory
is transferred with each cycle. (These transfers are called “duplex transfers.”)
The details of active and standby CPU Unit operations are described below.
Data Transfers
Active CPU Unit
Standby CPU Unit
User program
I/O memory
Parameters
• The setting at the Active Setting Switch on the Duplex Unit determines
• The R and L ACTIVE indicators on the Duplex Unit show which of the two
which of the two CPU Units is to be active.
CPU Units is active. The active/standby status can also be checked using
A32809 in the Auxiliary Area.
Data
Transferred from active to standby CPU Unit whenever changed.
Constantly transferred from active to standby CPU Unit.
Transferred from active to standby CPU Unit whenever changed.
The active CPU Unit is the main CPU Unit that executes con-
trol. It runs the user program and exchanges data with exter-
nal devices (through mounted Units and communications).
The standby CPU Unit runs the user program in parallel with
the active CPU Unit, and remains on standby to switch to
active status in case the active CPU Unit goes down. It con-
stantly receives updated data from the active CPU Unit.
Active CPU Unit
CPU Unit
Standby CPU Unit
Section 3-1
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