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LADDER LOGIC DESIGN EXAMPLE
CGiLL-1
The graphical configuration of the second secondary page:
Oil_On
27
Reset_MFT
Oil_OK
%Start_Oil_PB
Start_Oil
28
Oil_On
29
Start_Oil
Igniter_Proven
%Stop_Oil_PB
%Open_Oil_Valves
30
Oil_Delay
0.16667
31
TON
%Oil_V1_NotOpen
32
Oil_Delay
%Oil_V2_NotOpen
Oil_Start_Abort
33
%Open_Oil_Valves
Oil_Start_Abort
Oil_On
34
%RecrPmp_Stop_PB
%Close_Recirc
35
%Close_Recirc
%RecrPmp_Srt_PB
36
Gas_Start_Abort
37
Reset_MFT
Gas_OK
Start_Gas
%Start_Gas_PB
38
Gas_On
39
Start_Gas
Igniter_Proven
%Open_Gas_Valves
%Stop_Gas_PB
40
Gas_Delay
0.03333
TON
41
%Gas_V1_NotOpen
42
Gas_Delay
%Gas_V2_NotOpen
Gas_Start_Abort
43
%Vent_NotClosed
44
%Open_Gas_Valves
Gas_Start_Abort
%Burner_Flame
Gas_On
45
Op_Requirements
46
ULC_Loop_Error
47
%Master_Abort_PB
%MFT
48
ULC_Loop_Error
%System_Alarm
49
18
September 2005