8
Operating Modes Section 1-4
Note 1. The parameter area and user program (i.e., the user memory) can be
write-protected by turning ON pin 1 of the DIP switch on the front of the
CPU Unit.
2. EM file memory is part of the EM Area that has been converted to file
memory in the PLC Setup. All EM banks from the specified bank to the end
of the EM Area can be used only as file memory for storage of data and
program files.
3. Be sure to install the battery provided (CS1W-BAT01) before using a CS1
CPU Unit for the first time. After installing the battery, use a Programming
Device to clear the PLC’s RAM (parameter area, I/O memory area, and
user program).
4. A Battery is mounted to a CS1-H, CJ1, CJ1-H, or CJ1M CPU Unit when it
is shipped from the factory. There is no need to clear memory or set the
time.
5. The BKUP indicator on the front of the CPU Unit will light while data is be-
ing written to flash memory. Do not turn OFF the power supply to the CPU
Unit until the backup operation has been completed (i.e., until the BKUP
indicator goes out). Refer to
6-6-10 Flash Memory for details.
1-4 Operating Modes
1-4-1 Description of Operating Modes
The following operating modes are available in the CPU Unit. These modes
control the entire user program and are common to all tasks.
PROGRAM Mode Program execution stops in PROGRAM mode, and the RUN indicator is not lit.
This mode is used when editing the program or making other preparations
operation, such as the following:
CPU Unit
I/O memory area
Drive 1: EM file memory
(See note 2.)
Backup
Battery
A newly mounted battery will be good up to
five years at an ambient temperature of 25°C
Drive 0: Memory card
(flash memory)
User programUser program
File memory
Flash Memory
(CS1-H, CJ1-H, or CJ1M
CPU Units only)
Parameter area
Parameter area
(See note 1.)
Built-in RAM
Automatically backed up to flash memory whenever
a write operation for the user program or parameter
area is performed from a Programming Device.
Auto-
written
Auto-
written
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