!=F in Siemens S5 statement list

[edward4444]

I am interpreting STL for the first time for a Siemens S5 PLC. In the STL, I often see !=F in the code. What is this? Thanks.

 

[Maj. Toxido]

I am interpreting STL for the first time for a Siemens S5 PLC. In the STL, I often see !=F in the code. What is this? Thanks.

It is Arithmetic Operation

EX. +F
-F
xF
:F
:nodi:

 

[jacekd]

In fact it's comparison operator for equal.

 

[RolfB]

hi,

here you can download a short reference guide
for S5 115U:

http://support.automation.siemens.com/WW/view/en/1085938


regards
Rolf

 

[edward4444]

Thanks for answer

Very good... thanks for the info.
Edward