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Description of Operation
Section
3-2
92
3-2-6
Relationship between CPU Unit states and Loop Control Unit
States
3-2-6-1
Conditions for stopping and continuing running of the Loop Control Unit
Running of the Loop Control Unit is stopped or continued under the following
conditions.
Running stop conditions
Running continuation conditions
When the following malfunctions occur:
Unit number setting error
Initial recognition error
Unit error
Function block database error (when all
function blocks are in error)
CPU Unit error (WDT error, cyclic
monitor error, bus error)
CPU of CPU Unit in standby mode
CPU Unit fatal error (including
execution of FALS command)
Load rate exceeded at operation cycle
of 2 sec (Operation Cycle Automatic
Switching Generation flag is ON)
When the following
malfunctions occur:
Battery error
Function block database
error (when only a specific
function block is in error)
CPU Unit non-fatal error
(including execution of the
FAL command)
When CPU is in one of
PROGRAM, RUN or
MONITOR modes
When output of the CPU Unit is
OFF (Output OFF flag is ON)
Note
When the operation cycle of the Loop Control Unit is set to two seconds,
running of the Loop Control Unit is stopped when the load rate exceeds 70%
ten times continuously. (For details, see Section 3-2-10.)
3-2-6-2
Operation of the Loop Control Unit at a CPU Unit fatal error
When running of the CPU Unit has stopped due to a fatal error (including
execution of the FALS command), running of the Loop Control Unit is also
stopped.
Note
Analog Output Units C200H-DA003/004, CS1W-DA08V/C and CS1W-DA041
and Analog Input/Output Units C200H-MAD01 and CS1W-MAD44 have a
function (output hold function) for holding the analog output value to one of
the previous value, minimum value or maximum value when either of the
following has occurred:
Fatal error (including execution of the FALS command)
Output OFF
For this reason, use this output hold function of the Analog Output Unit to
hold the analog output values to a specific value when running of both the
CPU Unit and Loop Control Unit has stopped.
3-2-6-3
Operation of the Loop Control Unit when the CPU Unit is in the
PROGRAM mode
The Loop Control Unit continues to run even if the CPU Unit is in the
PROGRAM mode.