3-2
Instruction Operand Symbol Function Descriptions
Execution
Time
Instruction type
OUT
Send result to coil
OUT NOT
Y,M,S
Send inverted result to coil
OUT L Y
L
Send result to an external output coil and
appoint it as of retentive type
0.33uS
│
1.09uS
Coil output
instruction
OUT Save the node status to a temporary relay
LD
TR
Load the temporary relay
0.33uS
TU Take the transition up of the node status 0.33uS
TD Take the transition down of the node status 0.33uS
NOT
Invert the node status 0.33uS
Node operation
instruction
SET
S
()
Set a coil
0.33uS
│
1.09uS
RST
R
()
Reset a coil
0.33uS
│
1.09uS
● The 36 sequential instructions listed above are all applicable to every models of FBs-PLC.
3.2 Function Instructions
There are more than 100 different FBs-PLC function instructions. If put the “D” and “P” derivative instructions into account,
the total number of instructions is over 300. On top of these, many function instructions have multiple input controls (up to
4 inputs) which can have up to 8 different types of operation mode combinations. Hence, the size of FBs-PLC instruction
sets is in fact not smaller than that of a large PLC. Having powerful instruction functions, though may help for establishing
the complicated control applications, but also may impose a heavy burden on those users of small type PLC’s. For ease
of use, FATEK PLC function instructions are divided into two groups, the Basic function group which includes 26
commonly used function instructions and 4 SFC instructions and the advanced function group which includes other more
complicated function instructions, such as high-speed counters and interrupts. This will enable the beginners and the
non-experienced users to get familiar with the basic function very quickly and to assist experienced users in finding what
they need in the advanced set of function instructions.
The instructions attached with “” symbol are basic functions which amounts to 26 function instructions and 4 SFC
instructions. All the basic functions will be explained in next chapter. The details for the reset of functions please refer
advanced manual.
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