Duplex Operation Of Loop Controllers; Loop Controller Duplex Function - Omron SYSMAC CS Series Operation Manual

Duplex Operation of Loop Controllers

3-5

Duplex Operation of Loop Controllers

3-5-1

Loop Controller Duplex Function

Operation in Duplex
Mode
Conditions for
Switching Operation
Select Execute - Create Tag Files - Create HMI I/F memory map, execute
CSV tag compilation, specify the file name (default: HMI_IFMap.csv), and
save the CSV file.
The format of the data is as follows:
• Analog data
<Tag_name>_<ITEM_tag_name>,INT(or UNIT),<allocated_EM_Bank
No.>,<Address>,<Comment>
• Digital data (standard)
<Tag_name>_<ITEM_tag_name>,<Bit_position>,BOOL,<EM_Bank_No.
>,<Address>,<Comment>
If Process-control CPU-Units (CS1D-CPU@@P) are used, Loop Controller
errors will not cause the whole system to go down and loop control will con-
tinue. This enables PLCs to be used to construct restorable and highly reliable
process control systems.
The duplex function and restrictions that apply when Process-control CPU-
Units (CS1D-CPU@@P) are used in duplex mode are described below.
Refer to the CS1D Duplex System Installation Guide (Cat. No. W350) for
details of the entire CS1D Duplex System.
Mount two Process-control CPU-Units (CS1D-CPU@@P) of the same model
to the CPU Duplex Backplane, and set the Duplex Unit DPL/SPL mode setting
switch to DPL.
Both Process-control CPU Unit Loop Controllers always perform operations
for the same function block data. Both Loop Controllers exchange data with
the CPU Units.
The Loop Controller mounted to the active CPU Unit (i.e., the active Loop
Controller) exchanges data with external devices via the CPU Unit. The active
Loop Controller is monitored and settings are made using CX-Process Tool
software, SCADA software, or PTs (Programmable Terminals).
Operation switches when a fatal Inner Board error occurs on the active Loop
Controller. (The Fatal Inner Board Error Flag A40112 will turn ON to indicate
this error). The standby CPU becomes the active CPU and operation switches
to the Loop Controller mounted to the standby CPU (i.e., the standby Loop
Controller). The CS1D system changes from duplex mode to simplex mode.
The following fatal errors cause the operation to switch:
• WDT error: A42400 turns ON
• Inner bus error: A42401 turns ON
• Cyclic monitor error: A42402 turns ON
• Flash memory data error or function block database error (when all func-
tion blocks are in error) in duplex mode: A42403 turns ON.
The system will stop running if the same error occurs in the Loop Controller
that was on standby or if an operation switching error or fatal error occurs in
the CPU Unit.
Section 3-5
167