21
3-2
Data Flow
The data flow in the PID Control Unit is shown in the diagram below.
C200H PC
Data Setting Console
Write
Read
ON
OFF
SW2-2
Read
PID Control Unit
Write executed bank no.
The read operation and setting the executed bank number are possible from a
user program or from a device, such as the Programming Console, regardless of
the ON/OFF setting of SW2-2.
Data written from the Data Setting Console and data written with the EEPROM
write commands when SW2-1 (switching memory contents) is set to Normal are
written to the PID Control Unit EEPROM and are consequently retained when
the power supply is turned OFF.
Data written with RAM write commands when SW2-1 (switching memory con-
tents) is set to Normal, the SP value set when SW2-1 is set to Fixed, and
executed bank number settings made from the C200H PC are written directly to
RAM and are not saved to EEPROM. This data is lost when the power supply is
turned OFF.
Set SW2-2 under the display cover to the OFF position to enable data setting
from the Data Setting Console.
The “bank no.” can be set when operation is stopped (i.e., when the RUN bit is
OFF). During operation it is switched to “executed bank no.” and cannot be
changed from the Data Setting Console. To change the executed bank number,
use a user program or a device such as the Programming Console.
Operation begins when the RUN bit of the output relay turns ON. (For informa-
tion on output relays, refer to
Section 4 PC Memory Allocation and Program-
ming.
Data Settings from Data
Setting Console
Data Flow
