BAND_01 BAND Boolean And In1 In2 BOR_01 BOR Boolean Or In1 In2 BAND_02 Press_Sw <Local:1:I.Data.2> BNOT_01 BNOT Boolean Not In Out Press_Sw Figure 15-108 Comparison between ladder logic and the FBD equivalent for a combination of multiple inputs. Inputs L1 Motor_Start Motor_Stop Start Stop Start button for motor Motor_Start 0 Start button for motor Motor_Start <Local:1:I.Data.3> Motor contactor coil Motor_Run <Local:2:O.Data.4> BOR_01 BOR Boolean Or In1 In2 390 Part 6 Function Block Programming FBD equivalent Alarm ... Out Temp_Sw 0 0 Press_Sw 0 1 Sensor_1 0 Sensor_2 0 Sensor_3 0 ... Out 0 ... BAND Boolean And In1 In2 Out 0 In3 ... Temp_Sw <Local:1:I.Data.1> Sensor_1 <Local:1:I.Data.3> Sensor_2 <Local:1:I.Data.4> Sensor_3 <Local:1:I.Data.5> Alarm <Local:2:O.Data.4> Ladder logic Inputs Temp_Sw L1 Sensor_1 Sensor_2 Sensor_3 L2 Output Alarm Alarm Motor contactor coil Motor_Run <Local:2:O.Data.4> BAND_01 BAND Boolean And In1 In2 ... Out Output L2 Motor_Run C 0 Ladder logic Stop button for Motor_Stop <Local:1:I.Data.4> FBD equivalent 1 motor Stop button for motor Motor_Stop Motor contactor coil Motor_Run ... Out 0 Figure 15-109 Comparison between ladder logic and the FBD equivalent for a motor start/ stop control circuit.
Petruzella_ProgrammableLogicControllers__5e
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