Omron SYSMAC CS Series User Manual

95
Description of Operation Section 3-2
Hot start mode (ITEM018 = 1)
When operation is started in hot start mode (ITEM018 = 1), operation will start
with all ITEMs and function block values held at the values that existed before
the power was turned OFF or the Loop Controller was restarted. The EXEC
Indicator on the front panel will light at the same time.
A hot start cannot be performed more than 24 hours after power is turned
OFF for CS-series and CJ-series PLCs. If more than 24 hours has passed, a
cold start will be used.
!Caution If the power is turned ON after being OFF for 24 hours or longer, the Loop
Controller will automatically start using a cold start even if the startup mode is
set to a hot start. 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 starting
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 block
must be programmed as follows (same as the procedure for switching to
remote operation):
Processing: ITEM086 (Auto/Manual switch) of the Basic PID block or
Advanced PID block is set to 1 using ITEM 019 (Run Start flag) and ITEM 017
(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.
Cold start mode (ITEM018 = 2)
When operation is started in hot start mode (ITEM018 = 2), the memory area
used for operations, as well as the MV output, Auto/Manual switch, and
Remote/Local switch settings, are initialized as soon as the PLC’s power sup-
ply is turned ON or the Loop Controller is restarted and before operation is
started. The parameters for control and operation blocks and the SPs for con-
trol blocks are read from flash memory and written to RAM, and the HMI
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

Omron SYSMAC CS Series Specifications

General

Brand	Omron
Model	SYSMAC CS Series
Category	Controller
Language	English