In Siemens S7-300 PLC, what is funtion and funtion block ? What is the differe

In Siemens S7-300 PLC, what is funtion and funtion block ?
What is the difference between them ? When to use function
and when to use function block

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In Siemens S7-300 PLC, what is funtion and funtion block ? What is the difference between them ? W..

Answer / divya

Please note Function and Function Block both are subroutine
in case of s7-300 & 400. Whenever you are writing
structured program you make use of them.

The basic difference between them is Fuction(FC) don't
require addition memory block they can exist on their own.

Whereas Function Block(FB) compulsorialy require a memory
dedicated to it called as Data Block(DB). This data block
is called as Instance Data block as only that particulcar
FB can use it.

Function Block is used when after each call operation in
initial /input value needs to be changed.

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In Siemens S7-300 PLC, what is funtion and funtion block ? What is the difference between them ? W..

Answer / william lobo

support.automation.siemens.com

you may approach them for your answer if it is related to
specific equipment used by yourself.

vi S7 Standard Functions Part 2 C79000-G7076-C113-02 The
following functions and function blocks are described in
this manual:
Function or Function Block
Number
Page
oftware Timer On Delay—Retentive (TONR) FC80 5-2 Indirect
Block Move (IBLKMOV) FC81 4-2 Reset Range of Outputs (RSET)
FC82 1-2 Set Range of Outputs (SET) FC83 1-6 Add to Table
(ATT) FC84 2-2 First In/First Out Unload Table (FIFO) FC85
2-4 Table Find (TBL_FIND) FC86 2-6 Last In/First Out Unload
Table (LIFO) FC87 2-9 Table (TBL) FC88 2-11 Move Table to
Word (TBL_WRD) FC89 2-13 Word Shift Register (WSR) FC90 3-2
Word to Table (WRD_TBL) FC91 2-15 Bit Shift Register (SHRB)
FC92 3-4 Seven Segment Decoder (SEG) FC93 6-2 ASCII to Hex
(ATH) FC94 6-4 Hex to ASCII (HTA) FC95 6-6 Encode Binary
Position (ENCO) FC96 6-8 Decode Binary Position (DECO) FC97
6-9 Ten’s Complement (BCDCPL) FC98 6-10 Sum Number of Bits
(BITSUM) FC99 6-11 Reset Range of Immediate Outputs (RSETI)
FC100 1-4 Set Range of Immediate Outputs (SETI) FC101 1-8
Standard Deviation (DEV) FC102 7-2 Correlated Data Table
(CDT) FC103 2-18 Table to Table (TBL_TBL) FC104 2-21
Scaling Values (SCALE) FC105 6-12 Unscaling Values
(UNSCALE) FC106 6-14 Lead/Lag Algorithm (LEAD_LAG) FB80 6-
16 Discrete Control Alarm Timer (DCAT) FB81 5-4 Motor
Control Alarm Timer (MCAT) FB82 5-7 Index Matrix Compare
(IMC) FB83 8-2 Scan Matrix Compare (SMC) FB84 8-6 Event
Maskable Drum (DRUM) FB85 5-10 Pack Data (PACK) FB86 4-4