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FX Series Programmable Controllers Execution Times And Instructional Hierarchy 7
7-16
7.6 Limits Of Instruction Usage
7.6.1 Instructions Which Can Only Be Used Once In The Main Program Area
The followin
g
instructions can onl
y
be used once in the main pro
g
ram area. For PLC
applicabilit
y
please check either the detailed explanations of the instructions or the instruction
execution tables list earlier.
• Instructions which can onl
y
be used once are:
FNC 52 MTR FNC 60 IST FNC 70 TKY
FNC 57 PLSY FNC 61 SORT FNC 71 HKY
FNC 58 PWM FNC 62 ABSD FNC 72 DSW
FNC 59 PLSR FNC 63 INCD FNC 74 SEGL
FNC 68 ROTC FNC 75 ARWS
•Onl
y
one of either FNC 57 PLSY or FNC 59 PLSR can be pro
g
rammed at once.
Both instructions can not be present in the same active pro
g
ram.
7.6.2 Instructions Which Are Not Suitable
For Use With 110V AC Input Units
When usin
g
110V AC input units certain operations, functions and instructions are not
recommended for use due to lon
g
ener
g
ize/de-ener
g
ize (ON/OFF) times of the 110V input
devices.
•Pro
g
ram operations not recommended for use are:
- Interrupt routines
-Hi
g
h speed counters
• Instructions not recommended for use are:
FNC 51 REFF FNC 68 ROTC FNC 72 DSW
FNC 52 MTR FNC 70 TKY FNC 75 ARWS
FNC 56 SPD FNC 71 HKY
Note: althou
g
h selected FX0S units have 110V AC inputs, the instructions mentioned
above are not present in the CPU of the unit and hence cannot be used an
y
wa
y