203 
Main POU  
YTTS_Blinker 
Run in program POU 
Concept 
YTTS_Blinker 
Best Practice: 
Prefix FB name 
1. Avoid name 
conflict 
2. Organization 
Outputs calculate 
over many scans. 
Instance required. 
Memory reserved 
for execution. 
Executes separately 
from other instances 
User Function Block 
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204 
Overview 
Write a User Function Block POU 
“Q” output cycles according to input OnTime and OffTime 
Inputs 
» OffTime_ms 
» OnTime_ms 
Outputs 
» 
User Function Block 
OnTime_ms 
OffTim
e_ms 
OnTime_ms 
OffTim
e_ms 
OnTime_ms 
OffTim
e_ms 
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205 
Write Function Block Code 
User Function Block 
HINT: Check the 
Type, Usage, Init 
and Retain of each 
variable 
Best Practice: No 
Global Variables in a 
Function Block 
*.Q notation for 
direct connection 
Instance name can 
be changed 
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206 
Execute YTTS_Blinker  
Add to Main Program POU 
Connect variables 
Confirm output 
Extra Credit 
Drive simulator output 
Use best practice for IO 
Function Block Execution 
User Function Block 
Add FB to 
Program POU 
FB executes in 
Program POU 
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207 
Local Variable List 
Defines Inputs and appearance 
Troubleshooting - Input Order 
Undesired input order 
Unexpected Input 
User Function Block 
Order in list = Order 
of appearance 
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208 
Make Project 
Right-Click 
Update FB/FU 
Troubleshooting - Update 
User Function Block 
Update Function 
209 
Function Block Instances 
Insert YTTS_Blinker into the Main program POU 
Cause Two outputs to blink independently 
User Function Block 
210 
Jump to Label 
For efficiency 
Active 
To clear data 
after execute 
Function Block with Enable 
User Function Block 
211 
User Function Block Help 
Option 1: Description Worksheet in Function Block Program 
User Function Block 
Help = Text from “Description Worksheet “ 
212 
User Function Block Help 
Option 2: *.HTML file 
See Motionworks IEC Help 
Search “HTML” 
Graphics 
Language Codes 
User Function Block 
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