YOKOGAWA F3CU04-0S User Manual

B2-15
IM 34M06H62-02E 2nd Edition : June 2008-00
B2.2.11 Operation Parameters
There are two types of operation parameters: PID parameters and function settings.
The PID parameters include set point, proportional band, integral time, derivative time,
and alarm preset value parameters. The function settings include the two-input
changeover-related, SP-related, PV-related, operation-related, and alarm-related
function settings.
Unlike controller parameters and I/O parameters, operation parameters need not be
enabled before taking effect. The module checks the contents of the I/O data registers for
any change at input sampling intervals, and automatically enables any changes if the
new values are within valid data range. If new values are out of range, the module
discards them and restores the registers to their original values.
WARNING
You should disable the backup function if you expect parameters that are designated to
be automatically stored to be frequently updated. By default, the module automatically
stores the values of such parameters to the EEPROM each time they are updated. If
parameter values are frequently updated and the number of write executions exceeds
the maximum limit of 100,000, EEPROM may fail and subsequent storing is not
guaranteed. Therefore, in situations where stored parameters are frequently updated,
you should always disable the backup function using the NBKUP parameter.
Changing a controller parameter or I/O parameter initializes operation parameters.
Therefore, always set controller parameters and I/O parameters before operation
parameters.
You must observe some precautions when writing to the module. For details, see Section
B1.3, “Writing and Reading after Powering On.”
 Two-input Changeover Function Settings
Use these parameters to perform setup as required when using Two-input Changeover
mode. They can be used for setting the changeover mode and changeover temperature.
Table B2.18 Two-input Changeover Function Settings
Data Position Number
Symbol Description Unit Data Range
Default
Value
Attribute Stored
See
Also
Loop 1 Loop 2 Loop 3 Loop 4
361 761 SELMD
Two-input
changeover
mode
None 0: Automatic changeover using
temperature range
1: Automatic changeover using
two-input changeover upper
limit
2: Manual changeover using
input selection
0 RW 
C3.11
362 762 SELH
Two-input
changeover
upper limit
Industrial
unit
PRL to PRH if SELL < SELH. If
SELL  SELH, changeover
occurs with respect to SELH.
PRL+1 RW 
363 763 SELL
Two-input
changeover
lower limit
PRL RW 
CAUTION
CAUTION

YOKOGAWA F3CU04-0S Specifications

General

Brand	YOKOGAWA
Model	F3CU04-0S
Category	Control Unit
Language	English