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
instructions can onl
be used once in the main pro
ram area. For PLC
applicabilit
please check either the detailed explanations of the instructions or the instruction
execution tables list earlier.
• Instructions which can onl
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
one of either FNC 57 PLSY or FNC 59 PLSR can be pro
rammed at once.
Both instructions can not be present in the same active pro
ram.
7.6.2 Instructions Which Are Not Suitable
For Use With 110V AC Input Units
When usin
110V AC input units certain operations, functions and instructions are not
recommended for use due to lon
ener
ize/de-ener
ize (ON/OFF) times of the 110V input
devices.
•Pro
ram operations not recommended for use are:
- Interrupt routines
-Hi
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
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
wa
