Omron CS1W-LC001 Operation Manual page 106

Description of Operation
88
Note 1 When the START mode at power ON is set to hot start, correct operation
results cannot be obtained if the power is turned ON after a long power OFF.
For this reason, use CX-Process Tool or CX-Process Monitor to stop running
of the Loop Control Unit and start the Unit in the cold start mode to clear old
data held internally in function blocks that was active before the power was
turned OFF.
Note 2 By a cold start, the Basic PID block (Block Model 011) or Advanced PID
block (Block Model 012) are set to Manual. Perform either of the following
operations after turning the PC power ON or restarting the Loop Control Unit
to set the Basic PID block (Block Model 011) or Advanced PID block (Block
Model 012) on the Unit to Auto.
Á
Switch the Manual mode to the Auto mode using CX-Process Monitor.
Á
Switch the Manual mode to the Auto mode in the Step Ladder Program
block (Block Model 301)
In this operation, the ladders in the Step Ladder Program block must be
programmed as follows so that ITEM086 (Auto/Manual switch) of the
Basic PID block or Advanced PID block is set to 1 taking ITEM019 (Run
Start flag) and ITEM017 (cold start in progress) of the System Common
block as the input conditions.
01
S TE P
02
S TE P
000-019
R un S tart
flag
Note 3 All function blocks are executed at all times by turning the PC power ON or
restarting the Loop Control Unit.
However, execution of some function blocks is triggered by changes in the
state of specific ITEMs for some functions, for example, in the Constant ITEM
Setting block (Block Model 171) and the Variable ITEM Setting block (Block
Model 172).
5
T IM E R
000-017 001-086
(
S
C old start in A /M
progres s
000-019
(
R
R un S tart
flag
T o S TE P 02 5 se cs . late r
P ID 1 is A uto at pow er O N .
)
A t the s am e tim e, R un S tart flag is turned O F F.
)
Section 3-2