YOKOGAWA F3CU04-0S, User Manual

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C1-11
IM 34M06H62-02E 2nd Edition : June 2008-00
C1.4 Disabled Mode
The Disabled mode suspends one or both controller functions for a pair of two loops. The
‘Single Loop (odd-numbered loop disabled)’ controller mode disables the odd-numbered
loop. The Both Loops Disabled mode disables both loops of the pair. All controller
functions are deactivated for a disabled loop.
Even if a loop is disabled, functions for accessing, setting and controlling the loop are still
available. If an out-of-range value is written to a disabled loop, an error occurs. If a stored
parameter of a disabled loop is changed, the new parameter value is stored.
For a disabled loop, no input computation, PID computation or output computation is
performed; no input or output values are updated; and the alarm relays are forced to
OFF.
A disabled loop does not function even if its parameters are set.
If the controller mode is set to ‘Single Loop (odd-numbered loop disabled)’, the
even-numbered loop acts as a Single Loop.
The MD12 and MD34 (Controller Mode) registers are controller parameters. Changing a
controller parameter normally reverts all parameters of the module to their default values.
However, switching between the values 0, 3 and 4 (between the disabled-mode and
single-loop settings) of MD12 or MD34 does not initialize the parameters.