Clearing And Holding I/O Memory; Hot Start/Hot Stop Functions - Omron CP1L CPU UNIT - 06-2007 Operation Manual

Overview of I/O Memory Area
4-1-3

Clearing and Holding I/O Memory

Area
CIO I/O Area
Area
Serial PC Link Area
Internal I/O Area
Work Area (W)
Holding Area (H)
Auxiliary Area (A)
Data Memory Area (D)
Timer Completion Flags (T)
Timer PVs (T)
Counter Completion Flags (C)
Counter PVs (C)
Task Flags (TK)
Index Registers (IR)
Data Registers (DR)
4-1-4

Hot Start/Hot Stop Functions

Operating Mode Changes
1
Mode changed
Execution of FALS
IOM Hold IOM Hold IOM Hold
Bit OFF Bit ON Bit OFF
Cleared Retained Retained
Cleared Retained Retained
Retained Retained Retained
Status treatment depends on address.
Retained Retained Retained
Cleared Retained Retained
Cleared Retained Retained
Retained Retained Retained
Retained Retained Retained
Cleared Cleared Retained
Cleared Retained Retained
Cleared Retained Retained
Note 1. Mode changed from PROGRAM to RUN/MONITOR or vice-versa.
2. The PLC Setup's IOM Hold Bit Status at Startup setting determines wheth-
er the IOM Hold Bit's status is held or cleared when the PLC is turned ON.
Hot Start
Turn ON the IOM Hold Bit to retain all data* in I/O memory when the CPU Unit
is switched from PROGRAM mode to RUN/MONITOR mode to start program
execution.
Hot Stop
When the IOM Hold Bit is ON, all data* in I/O memory will also be retained
when the CPU Unit is switched from RUN or MONITOR mode to PROGRAM
mode to stop program execution.
Note *The following areas of I/O memory will be cleared during mode changes
(between PROGRAM and RUN/MONITOR) unless the IOM Hold Bit is ON:
the CIO Area (I/O Area, Data Link Area, CPU Bus Unit Area, Special I/O Unit
Area, DeviceNet (CompoBus/D) Area, and Internal I/O Areas), Work Area,
Timer Completion Flags, and Timer PVs.
Fatal error generated
Other fatal errors
IOM Hold IOM Hold IOM Hold
Bit ON Bit OFF Bit ON
Retained Cleared Retained
Retained Cleared Retained
Retained Retained Retained
Retained Retained Retained
Retained Cleared Retained
Retained Cleared Retained
Retained Retained Retained
Retained Retained Retained
Retained Cleared Cleared
Retained Cleared Retained
Retained Cleared Retained
PROGRAM
Retain
MONITOR or RUN
MONITOR or RUN
Retain
PROGRAM
Section 4-1
PLC power turned ON
PLC Setup set to PLC Setup set to
clear IOM Hold Bit hold IOM Hold Bit
2
status status
IOM Hold IOM Hold IOM Hold
Bit OFF Bit ON Bit OFF
Cleared Cleared Cleared
Cleared Cleared Cleared
Retained Retained Retained
Retained Retained Retained
Cleared Cleared Cleared
Cleared Cleared Cleared
Retained Retained Retained
Retained Retained Retained
Cleared Cleared Cleared
Cleared Cleared Cleared
Cleared Cleared Cleared
I/O memory
CIO and
other areas
I/O memory
CIO and
other areas
2
IOM Hold
Bit ON
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Retained
Cleared
Retained
Retained
127