SFC 14 is used to read data consistantly from DP slave no 256 i.e. drive & is recoreded in DB20.DBB20 to DB20.DBB32

SFC 15 is used to write data consistantly to DP slave no 256 from DB20.DBB0 to DB.DBB12 to drive.

To know more about SFC 14 & 15 please refer below links.

How can you access consistent data without SFC14/15 as part of the process image?

Process Image vs. SFC14/15

SFC 14 and SFC 15

Usage SFC14 and SFC15

How to use SFC14 and SFC15 

Flourine

Program pdf in zip is enclosed here

 Hello,

FC1 is for drive address 256. Depending upon input DB20.DBB1 is set & I6.1 & I6.2 inputs are for  direction selection. Fixed set point in WORD data type DB20.DBW2 is transfered to drive. Fixed speed values are selectable from 2000, 6000,12000, 20000. 

FC2 is for drive address 268. Depending upon input DB20.DBB41 is set & I7.1 & I7.2 inputs are for  direction selection. Fixed set point in WORD data type DB20.DBW42 is transfered to drive. Fixed speed values are selectable from 2000, 6000,12000, 20000.

FC3 is for drive address 290. Depending upon input DB20.DBB81 is set & I8.1 & I8.2 inputs are for  direction selection. Fixed set point in WORD data type DB20.DBW82 is transfered to drive. Fixed speed values are selectable from 2000, 6000,12000, 20000.

FC4 is for drive address 280. Depending upon input DB20.DBB121 is set & I9.1 & I9.2 inputs are for  direction selection. Fixed set point in WORD data type DB20.DBW122 is transfered to drive. Fixed speed values are selectable from 2000, 6000,12000, 20000.

So 4 drives are controlled.

HTH.