Chapter 6 FBD Block  Diagram Programming    166 
RTC Comparator Function Block 
There is a maximum of 250 RTC function blocks under FBD mode, can be set mode 0~4 and the function is same as 
Ladder mode. 
 
(1)  RTC Mode 0(Internal Coil) 
 
Mode 0 RTC (Internal Coil) used as internal auxiliary coils. No timer preset value and no parameter display. 
 
 FBD display    
 
Enable Input 
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