7 Applied Instructions
7.1 Program Flow
123
FXCPU Structured Programming Manual
(Basic & Applied Instruction)
1
Outline
2
Instruction List
3
Configuration of
Instruction
4
How to Read
Explanation of
Instructions
5
Basic Instruction
6
Step Ladder
Instructions
7
Applied
Instructions
8
Interrupt Function
and Pulse Catch
Function
A
Relationships
between devices
and addresses
Cautions on subroutines and interrupt routines
This section explains cautions on creating programs in subroutines and interrupt routines.
The explanation below is given for subroutines, but the situation also applies to interrupt routines.
1. When using timers in subroutines (or interrupt routines)
Use retentive type timers T192 to T199 in subroutines.
These timers execute counting when the coil instruction or END instruction is executed.
After a timer reaches the set value, the output contact is activated when the coil instruction or END instruction
is executed.
Because general timers execute counting only when the coil instruction is executed, they do not execute
counting if they are used in subroutines in which the coil instruction is executed only under some conditions.
2. When using retentive type 1 ms timers in subroutines (or interrupt routines)
If a retentive type 1 ms timer is used in a subroutine, note that the output contact is activated when the first
coil instruction (or subroutine) is executed after the timer reaches its set value.
3. Countermeasures against latches of devices used in subroutines (or interrupt routines)
Devices which were set to ON in a subroutine are latched in the ON status even after the subroutine is
finished. (Refer to the program described later.)
When RST instruction for a timer or counter is executed, the reset status of the timer or counter is latched
also.
For turning OFF such a device latched in the ON status or for canceling such a timer or counter latched in the
reset status, reset such a device in the main program after the routine is finished, or program a sequence for
resetting such a device or for deactivating RST instruction in the routine. (Refer to the program described
later.)
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