Fuji Electric FRENIC-HVAC User Manual page 578

Notes for using a customizable logic

The customizable logic is calculated for every 5 ms and processed in the following procedure.
(1) At the start of processing, latch the external input signals to all customizable logics in
steps 1 to 14 to ensure concurrency.
(2) Execute the logic calculations from steps 1 to 14.
(3) If an output of a particular step applies to an input at the next step, the output of the step
having processing priority can be used in the same processing.
(4) The customizable logic updates 7 output signals at a time.
When configuring a logic circuit, take into account the processing order of the customizable
logic. Otherwise, a delay in processing of logical operation leads to a signal delay problem,
resulting in no expected output, slow processing, or a hazard signal issued.
Ensure safety before modifying customizable logic related function code settings (U codes and
related function codes) or turning ON the "Cancel customizable logic" terminal command
CLC. Depending upon the settings, such modification or cancellation of the customizable logic
may change the operation sequence to cause a sudden motor start or an unexpected motor
operation.
An accident or injuries could occur.
Customizable logic timer monitor (step selection) (U91, X89 to X93)

The monitor function code can be used to monitor the input/output state in the customizable
logics and timer operation status.
Selecting a timer to be monitored
Function code
U91 0: Disable monitoring (Monitor data is set to 0.)
1 to 14: Specify the step number to be monitored.
Monitoring
Monitored by:
Communications X89 customizable logic (Digital
link input/output)
X90 Customizable logic (Timer monitor) Timer/counter value specified
X91 customizable logic (Analog input
1)
X92 customizable logic (Analog input
2)
X93 customizable logic (Analog output) Analog output data of the step
Function
Related function code and
LCD monitor display
6-268
Remarks
Turning the power off
zero-clears the setting
value.
Monitor item
Digital I/O data of the step
specified with U91
(monitor-specific)
with U91 (monitor-specific)
Analog input 1 data of the step
specified with U91
(monitor-specific)
Analog input 2 data of the step
specified with U91
(monitor-specific)
specified with U91
(monitor-specific)