Memory In The Temperature Control Unit - Omron CJ Series Operation Manual

Data Exchange with the CPU Unit
Special I/O Unit
Restart Bits
2-5-3

Memory in the Temperature Control Unit

Memory allocations in CPU
Unit
CIO Area Operation Data
DM Area Initialization Data
Operating Param-
eters
Note
To restart the Unit after changing the contents of the DM Area or correcting an
error, turn ON the power to the PLC again or turn the Special I/O Unit Restart
Bit ON and then OFF again.
Special I/O Unit
Area word
address
A50200
A50201
:
A50215
A50300
:
A50715
Note If the error is not corrected by restarting the Unit or turning the Special I/O
Unit Restart Bit ON and then OFF again, refer to SECTION 5 Error and Alarm
Processing.
The Temperature Control Unit has two types of memory: RAM and EEPROM.
As shown in the following table and illustration, data for the Temperature Con-
trol Unit is written from the words allocated in the CPU Unit to the RAM in the
Temperature Control Unit. Some of this data can be written from the RAM to
EEPROM by turning ON a Save Bit.
If pin 8 on the DIP switch is ON, the data stored in the EEPROM will automat-
ically be transferred to the DM Area in the CPU Unit when power is turned ON
or the Temperature Control Unit is restarted, enabling operation with the data
stored in the EEPROM.
Main settings Transfer from
CPU Unit areas
Temperature
Control Unit
Set Point I/O refresh period
Heater Burnout
Current
Alarm Mode Power ON or Unit
Alarm Hysteresis restart
Alarm SV I/O refresh period
Input Compensa-
tion
Control Period
Sensitivity
Proportional Band I/O refresh period
Integral Time as long as PID
Derivative Time Constants
Changed Flag is
OFF (See note.)
1. The PID constants resulting from autotuning are automatically written to
RAM at the end of autotuning.
2. The EEPROM has a life of 100,000 writes.
Unit No. 0 Restart Bit
Unit No. 1 Restart Bit
:
Unit No. 15 Restart Bit
Unit No. 16 Restart Bit
:
Unit No. 95 Restart Bit
Transfer from RAM
to EEPROM
to RAM in
Not transferred.
Not transferred.
When Save Bit in
Special I/O Unit
Area is turned ON.
Section 2-5
Function
Restarts the Unit when turned
ON and then OFF again.
Transfer from
EEPROM in
Temperature Control
Unit to CPU Unit areas
When power is turned
ON or the Unit is
restarted with pin 8 on
the DIP switch turned
ON.
31