xxvii
Safety Precautions 3
!WARNING The Loop Controller will automatically start using a cold start even if the star-
tup mode is set to a hot start if the power is turned ON after being OFF for
24 hours or longer. If this happens, the auto/manual setting for the Control
Block will be set to manual mode (MV=0%) and the remote/local setting will
be set to local. To automatically switch to auto mode at the same time as start-
ing operation after the power is turned ON after being OFF for 24 hours or
longer, the ladder diagrams in the Sequence Table or Step Ladder Program
blocks must be programmed as follows (same as the procedure for switching
to remote operation):
Processing: ITEM 086 (Auto/Manual switch) of the Basic PID block or
Advanced PID block is set to 1 using ITEM019 (Run Start Flag) and ITEM017
(cold start in progress) of the System Common block as the input conditions.
Sequence Table
Step Ladder Program
For details on hot and cold start operations, refer to 3-2-3 Details of Hot Start,
Cold Start and Stop State.
!WARNING When using the CS1D-CPU@@P Process-control CPU Unit, both the CPU
Unit’s cycle time and the Loop Controller’s operation cycle will be temporarily
longer than normal during duplex initialization (in duplex mode). The extended
cycle time and operation cycle may temporarily worsen the control character-
istics, so verify the system’s operation in test runs before actually running the
system.
!Caution When downloading a sequence table for the Loop Control Board (version 1.5
or higher) that has been edited online with the CX-Process Tool version 3.2 or
higher, confirm that the system will operate normally with the edited
sequence. If the sequence is not suitable for operation, unexpected operation
may result.
Signal
00
STEP
000.019 Y
000.017 Y
001.086 Y
000.019 N
THENNEXT
STEP
ELSE
Run Start flag
Cold start in progress
A/M
Run Start flag
PID1 is Auto at power ON.
000-019 000-017
S
A/M
000-019
Run Start
flag
Cold start in
progress
Run Start
flag
R
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