PM891K01 3BSE053241R1 梯形逻辑中通电线圈的着色

The instructions in the PLC program with highlighted colors follow similar rules. PM891K01 3BSE053241R1 When all contact commands before a coil are closed (colored), the coil will “open” (colored). The color coil writes “1” to its corresponding bit in memory, while the non color coil instruction writes “0” to its corresponding bit in memory. If these bits are associated with the actual discrete output channels on the PLC, their states will control the actual power on of the devices connected to these channels.

To further clarify these basic concepts, we will study the operation of a simple PLC system designed to activate warning lights when low pressure occurs in the fluid process pipeline. The task of the PLC is to light up the alarm light when the pressure in the process vessel drops below 270 PSI, and to keep the alarm light energized even if the pressure exceeds the trigger point of 270 PSI again. Through this approach, operators will remain vigilant about past and gift process container overpressure events in both situations.

PM891K01 3BSE053241R1 control voltage (+24 and 0 volts) provides electrical energy to the signal potential of the input switch and supplies power to the alarm light. Two switches are connected to the input terminals of the PLC: one normally open button switch is used for alarm reset (pressing the switch unlocks the alarm light), and one normally open pressure switch is used as a sensing element for process pressure