Measures For A Cpu Unit Fatal Error; Required Conditions For The Man-Machine Interface - Omron SYSMAC CS1W-LCB01 Operation Manual

Fail-safe Countermeasure Guidelines
3-6-2

Measures for a CPU Unit fatal error

Note
3-6-3

Required Conditions for the Man-Machine Interface

imum value or minimum value). This must be taken into consideration
when designing the system.
2. Processing that causes the Loop Controller to stop running can also be ex-
ecuted when the CPU Unit is in the PROGRAM mode.
In this case, enter ITEM013 (PROGRAM mode) of the System Common
block (Block Model 000) as the CPU Unit run status, and set ITEM014
(run/stop command) of the System Common block to 0 (stop) by the Step
Ladder Program block (Block Model 301) and the ITEM Setting blocks
(Block Models 171 and 172).
System Common Sequence Table
block
or Step Ladder
Program block
013
When a fatal error occurs on the CPU Unit (including during execution of the
FALS command), the Loop Controller also stops running. To hold the analog
output to the previous value before the stop occurred, and to set the analog
output to either the minimum value or maximum value, use the output hold
function of the Analog Output Unit or Analog Input/Output Unit.
The Loop Controller continues to run even if the Output OFF flag causes out-
put refreshing of the CPU Unit to stop. Note, however, that in this case con-
tacts are not output and turn OFF, and the output hold function of the Analog
Output Unit holds analog output to a specific value. For this reason, the Loop
Controller only performs internal operations, and does not perform control on
the outside.
The Loop Controller Interface itself does not have a man-machine interface.
So, an external interface such as SCADA software that satisfies the following
conditions must be provided:
• Loop Controller run/stop command function and run status display func-
tion (operation of ITEM014 to ITEM017 of the System Common block)
• Loop Controller error status display function (operation of ITEM091 to
ITEM095 of System Common block)
• Basic display function for Set Point, PV, MV and other values
• Basic setting function for Set Point and other settings
• Function for changing P, I, D and other parameters
• Auto/Manual switching and manual operation functions
Section 3-6
ITEM Setting System Common
block block
014
173