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Duplex Operation of Loop Controllers Section 3-5
Automatic Reset to
Duplex Mode
Function Using Self-
diagnostics
The CS1D system will be automatically restored from simplex mode to duplex
mode if self-diagnostics detects that a fatal Inner Board error has been
cleared after the error caused the CS1D system to change from duplex mode
to simplex mode and if the Return Automatically option is enabled in the PLC
Setup. The Loop Controller diagnosed as normal by self-diagnostics will be on
standby.
Conditions for
Executing Duplex
Initialization
Duplex initialization is executed in the following conditions when Process-con-
trol CPU Units (CS1D-CPU@@P) are used in duplex mode.
1,2,3... 1. Operations on CPU Units
• When power is supplied to PLC
• When Duplex Unit's initialize switch is turned ON
• When the CPU Unit starts operating
• When data is transferred to the CPU Unit (user programs, PLC Setup, I/O
tables, CPU Bus Unit system setting area transfers, timer/counter setting
changes, or online editing)
2. Operations on Loop Controllers
• When a cold start command is sent to Loop Controller
• When the Inner Board is restarted when A60800 turns ON
• When Loop Controller internal error log is cleared
Note 1. The following operations cannot be performed using the CX-Process Tool
software while duplex initialization is being executed.
• All clear, batch download, recovery, and backup.
Note Any operation stop command that is sent for an LCB during duplex
initialization will be ignored and operation will be started automati-
cally when duplex initialization has been completed.
2. Duplex initialization will restart when any of the following is performed dur-
ing duplex initialization.
• Function block data is downloaded from the CX-Process Tool soft-
ware, whether the data is sent to the whole LCB, to one function block,
or as individual ITEMs.
• An ITEM is written in a Loop Control Board using the FINS command.
• An operation command is sent to the Loop Control Board.
3. The function block data in the left and right Loop Control Boards may not
be the same after a power interruption occurs during duplex initialization.
A database error may thus occur after recovery from a power interruption.
If this happens, download the function block data again from the CX-Pro-
cess Tool.
4. User link tables and the HMI interface can be used to read and write I/O
memory in the CPU Unit even during duplex initialization.
3-5-2 Outline of Procedure for Using Duplex Mode
1,2,3... 1. Connect the CX-Process Tool software to the active CPU Unit and down-
load the function block data. Function block data cannot be downloaded if
the CX-Process Tool software is connected to the standby CPU Unit.
2. Send the run command from the CX-Process Tool to start operation.
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